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Takayuki Komatsu - One of the best experts on this subject based on the ideXlab platform.
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A review: A new insight for Electronic Polarizability and chemical bond strength in Bi2O3-based glasses
Journal of Non-Crystalline Solids, 2020Co-Authors: Takayuki Komatsu, Vesselin Dimitrov, Tina Tasheva, Tsuyoshi HonmaAbstract:Abstract Bismuth oxide (Bi2O3)-based glasses showing outstanding properties such as high linear refractive indices, low glass transition temperatures, and high third-order nonlinear optical susceptibilities are promising materials for low temperature melting and photonic device applications. The present article reviews the current status of the Electronic Polarizability in Bi2O3-based glasses with glass-forming oxides and modifiers through the refractive index-based optical basicity Λ(no) and interionic interaction parameter A(no) in to understand deeply the uniqueness of Bi2O3-based glasses among other oxide glasses. The values of Λ(no), and A(no) in some Bi2O3-based glasses were estimated newly in this article. It was clarified that Bi2O3-based glasses exhibit an extremely strong basic nature with Λ(no)∼1.15 and extremely weak chemical bond strength with A(no)∼0.01 A−3 among oxide glasses, being more basic compared with TeO2-based glasses with Λ(no)∼1.0 and A(no)∼0.03 A−3. The outstanding properties of Bi2O3-based glasses were discussed from the viewpoints of Electronic Polarizability and weak chemical bond strength.
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synthesis Electronic Polarizability and β bab2o4 crystallization in bao b2o3 teo2 glasses
Journal of Non-crystalline Solids, 2015Co-Authors: Y.j. Cha, Takayuki Komatsu, J.h. Kim, J.-h. Yoon, B.s. Lee, S. Choi, K.s. Hong, E.d. Jeong, H.g. KimAbstract:Abstract Glasses with the compositions of x BaO– x B 2 O 3 –(100-2 × )TeO 2 with x = 15–40 mol% were prepared by using a conventional melt quenching method, and their optical properties, Electronic Polarizability, and crystallization behavior were examined. The Electronic Polarizability and optical basicity of the glasses are relatively large (e.g., Λ( n o ) = 0.856–0.970), indicating that all glasses prepared are regarded as basic (high polarizable) glasses. In the crystallization of 40BaO–40B 2 O 3 –20TeO 2 glass, both TeO 2 and β-BaB 2 O 4 (β-BBO) crystals are formed almost simultaneously. The formation of β-BBO nanocrystals with a diameter of around 5 nm was confirmed from the transmission electron microscope observations, and a hetero-epitaxial crystal growth between TeO 2 and β-BBO crystals was suggested. The glass-ceramics with β-BBO crystals exhibited second harmonic generations, although they are not transparent.
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Synthesis, Electronic Polarizability and β-BaB2O4 crystallization in BaO–B2O3–TeO2 glasses
Journal of Non-Crystalline Solids, 2015Co-Authors: Y.j. Cha, Takayuki Komatsu, J.h. Kim, J.-h. Yoon, B.s. Lee, S. Choi, K.s. Hong, E.d. Jeong, H.g. KimAbstract:Abstract Glasses with the compositions of x BaO– x B 2 O 3 –(100-2 × )TeO 2 with x = 15–40 mol% were prepared by using a conventional melt quenching method, and their optical properties, Electronic Polarizability, and crystallization behavior were examined. The Electronic Polarizability and optical basicity of the glasses are relatively large (e.g., Λ( n o ) = 0.856–0.970), indicating that all glasses prepared are regarded as basic (high polarizable) glasses. In the crystallization of 40BaO–40B 2 O 3 –20TeO 2 glass, both TeO 2 and β-BaB 2 O 4 (β-BBO) crystals are formed almost simultaneously. The formation of β-BBO nanocrystals with a diameter of around 5 nm was confirmed from the transmission electron microscope observations, and a hetero-epitaxial crystal growth between TeO 2 and β-BBO crystals was suggested. The glass-ceramics with β-BBO crystals exhibited second harmonic generations, although they are not transparent.
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Electronic Polarizability and interaction parameter of gadolinium tungsten borate glasses with high WO 3 content
Journal of Solid State Chemistry, 2014Co-Authors: Yukina Taki, Tsuyoshi Honma, Vesselin Dimitrov, Kenji Shinozaki, Takayuki KomatsuAbstract:Abstract Glasses with the compositions of 25Gd 2 O 3 – x WO 3 –(75− x )B 2 O 3 with x =25–65 were prepared by using a conventional melt quenching method, and their Electronic polarizabilities, optical basicities Λ ( n o ), and interaction parameters A ( n o ) were estimated from density and refractive index measurements in order to clarify the feature of Electronic Polarizability and bonding states in the glasses with high WO 3 contents. The optical basicity of the glasses increases monotonously with the substitution of WO 3 for B 2 O 3 , and contrary the interaction parameter decreases monotonously with increasing WO 3 content. A good linear correlation was observed between Λ ( n o ) and A ( n o ) and between the glass transition temperature and A ( n o ). It was proposed that Gd 2 O 3 oxide belongs to the category of basic oxide with a value of A ( n o )=0.044 A −3 as similar to WO 3 . The relationship between the glass formation and Electronic Polarizability in the glasses was discussed, and it was proposed that the glasses with high WO 3 and Gd 2 O 3 contents would be a floppy network system consisting of mainly basic oxides.
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Temperature dependence of refractive index and Electronic Polarizability of RO–TeO2 glasses (R=Mg, Ba, Zn)
Solid State Sciences, 2012Co-Authors: Takayuki Komatsu, Tsuyoshi Honma, Noriko Ito, Vesselin DimitrovAbstract:The refractive indices (n) and densities (ρ) of xRO − (100 − x)TeO2 glasses (R = Mg, Ba, and Zn) with x = 10–40 are measured in the temperature range of 50–150 °C in order to clarify thermo-optic coefficients (dn/dT) and the temperature dependence of the Electronic Polarizability of oxide ions (αO2−) and optical basicity (Λ). It is found that the values of n, αO2−, and Λ increase almost linearly with increasing temperature. The values of dn/dT are between 7.32 and 9.69 × 10−5 K−1 and tend to decrease with increasing RO content. Contrary, the values of ⅆαO2−/ⅆT and dΛ/dT are almost constant irrespective of RO content. It is suggested that the Electronic Polarizability has an important contribution on thermo-optic coefficients, but the contribution of volume thermal expansion on thermo-optic coefficients is not ignored. In the analyses of Electronic polarizabilities of RO–TeO2 glasses, the concept of group optical basicity for TeO3 and TeO4 structural units is also applied. It is explained that large thermo-optic coefficients in RO–TeO2 glasses are composed of oxides having small average single bond strengths and large optical basicities.
Vesselin Dimitrov - One of the best experts on this subject based on the ideXlab platform.
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A review: A new insight for Electronic Polarizability and chemical bond strength in Bi2O3-based glasses
Journal of Non-Crystalline Solids, 2020Co-Authors: Takayuki Komatsu, Vesselin Dimitrov, Tina Tasheva, Tsuyoshi HonmaAbstract:Abstract Bismuth oxide (Bi2O3)-based glasses showing outstanding properties such as high linear refractive indices, low glass transition temperatures, and high third-order nonlinear optical susceptibilities are promising materials for low temperature melting and photonic device applications. The present article reviews the current status of the Electronic Polarizability in Bi2O3-based glasses with glass-forming oxides and modifiers through the refractive index-based optical basicity Λ(no) and interionic interaction parameter A(no) in to understand deeply the uniqueness of Bi2O3-based glasses among other oxide glasses. The values of Λ(no), and A(no) in some Bi2O3-based glasses were estimated newly in this article. It was clarified that Bi2O3-based glasses exhibit an extremely strong basic nature with Λ(no)∼1.15 and extremely weak chemical bond strength with A(no)∼0.01 A−3 among oxide glasses, being more basic compared with TeO2-based glasses with Λ(no)∼1.0 and A(no)∼0.03 A−3. The outstanding properties of Bi2O3-based glasses were discussed from the viewpoints of Electronic Polarizability and weak chemical bond strength.
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Electronic Polarizability and interaction parameter of gadolinium tungsten borate glasses with high WO 3 content
Journal of Solid State Chemistry, 2014Co-Authors: Yukina Taki, Tsuyoshi Honma, Vesselin Dimitrov, Kenji Shinozaki, Takayuki KomatsuAbstract:Abstract Glasses with the compositions of 25Gd 2 O 3 – x WO 3 –(75− x )B 2 O 3 with x =25–65 were prepared by using a conventional melt quenching method, and their Electronic polarizabilities, optical basicities Λ ( n o ), and interaction parameters A ( n o ) were estimated from density and refractive index measurements in order to clarify the feature of Electronic Polarizability and bonding states in the glasses with high WO 3 contents. The optical basicity of the glasses increases monotonously with the substitution of WO 3 for B 2 O 3 , and contrary the interaction parameter decreases monotonously with increasing WO 3 content. A good linear correlation was observed between Λ ( n o ) and A ( n o ) and between the glass transition temperature and A ( n o ). It was proposed that Gd 2 O 3 oxide belongs to the category of basic oxide with a value of A ( n o )=0.044 A −3 as similar to WO 3 . The relationship between the glass formation and Electronic Polarizability in the glasses was discussed, and it was proposed that the glasses with high WO 3 and Gd 2 O 3 contents would be a floppy network system consisting of mainly basic oxides.
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Temperature dependence of refractive index and Electronic Polarizability of RO–TeO2 glasses (R=Mg, Ba, Zn)
Solid State Sciences, 2012Co-Authors: Takayuki Komatsu, Tsuyoshi Honma, Noriko Ito, Vesselin DimitrovAbstract:The refractive indices (n) and densities (ρ) of xRO − (100 − x)TeO2 glasses (R = Mg, Ba, and Zn) with x = 10–40 are measured in the temperature range of 50–150 °C in order to clarify thermo-optic coefficients (dn/dT) and the temperature dependence of the Electronic Polarizability of oxide ions (αO2−) and optical basicity (Λ). It is found that the values of n, αO2−, and Λ increase almost linearly with increasing temperature. The values of dn/dT are between 7.32 and 9.69 × 10−5 K−1 and tend to decrease with increasing RO content. Contrary, the values of ⅆαO2−/ⅆT and dΛ/dT are almost constant irrespective of RO content. It is suggested that the Electronic Polarizability has an important contribution on thermo-optic coefficients, but the contribution of volume thermal expansion on thermo-optic coefficients is not ignored. In the analyses of Electronic polarizabilities of RO–TeO2 glasses, the concept of group optical basicity for TeO3 and TeO4 structural units is also applied. It is explained that large thermo-optic coefficients in RO–TeO2 glasses are composed of oxides having small average single bond strengths and large optical basicities.
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approach to thermal properties and Electronic Polarizability from average single bond strength in znobi2o3b2o3 glasses
Journal of Solid State Chemistry, 2010Co-Authors: Taisuke Inoue, Tsuyoshi Honma, Vesselin Dimitrov, Takayuki KomatsuAbstract:The glass transition temperature (T{sub g}), density, refractive index, Raman scattering spectra, and X-ray photoelectron spectra (XPS) for xZnO-yBi{sub 2}O{sub 3}-zB{sub 2}O{sub 3} glasses (x=10-65, y=10-50, z=25-60 mol%) are measured to clarify the bonding and structure features of the glasses with large amounts of ZnO. The average Electronic Polarizability of oxide ions ({alpha}{sub O2-}) and optical basicity ({Lambda}) of the glasses estimated using Lorentz-Lorenz equation increase with increasing ZnO or Bi{sub 2}O{sub 3} content, giving the values of {alpha}{sub O2-}=1.963 A{sup 3} and {Lambda}=0.819 for 60ZnO-10Bi{sub 2}O{sub 3}-30B{sub 2}O{sub 3} glass. The formation of B---O---Bi and B---O---Zn bridging bonds in the glass structure is suggested from Raman and XPS spectra. The average single bond strength (B{sub M---O}) proposed by Dimitrov and Komatsu is applied to the glasses and is calculated using single bond strengths of 150.6 kJ/mol for Zn---O bonds in ZnO{sub 4} groups, 102.5 kJ/mol for Bi---O bonds in BiO{sub 6} groups, 498 kJ/mol for B---O bonds in BO{sub 3} groups, and 373 kJ/mol for B---O bonds in BO{sub 4} groups. Good correlations are observed between T{sub g} and B{sub M---O}, {Lambda} and B{sub M---O}, and T{sub g} and {Lambda}, proposing that the average single bond strength is amore » good parameter for understanding thermal and optical properties of ZnO---Bi{sub 2}O{sub 3}---B{sub 2}O{sub 3} glasses. -- Graphical abstract: This figure shows the correlation between optical basicity {Lambda} and average single bond strength B{sub M---O} in ZnO---Bi{sub 2}O{sub 3}---B{sub 2}O{sub 3} glasses. A good correlation is observed, proposing that the average single bond strength is a good parameter for understanding optical properties of ZnO---Bi{sub 2}O{sub 3}---B{sub 2}O{sub 3} glasses. Display Omitted« less
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thermo optic properties and Electronic Polarizability in alkali tellurite glasses
Journal of the American Ceramic Society, 2010Co-Authors: Tsuyoshi Honma, Noriko Ito, Takayuki Komatsu, Vesselin DimitrovAbstract:The refractive indices (n) and densities (ρ) of xLi2O–(100−x)TeO2 glasses with x=15–30 and xNa2O–(100−x)TeO2 glasses with x=10–20 are measured in the temperature range of 30°–150°C in order to clarify thermo-optic coefficients (dn/dT) and the temperature dependence of the Electronic Polarizability of oxide ions () and optical basicity (Λ). It is found that the values of n, , and Λ increase almost linearly with increasing temperature. The values of dn/dT are around 7 × 10−5 K−1 and tend to decrease with increasing alkali content (Li2O, Na2O). In contrast, the values of d/dT and dΛ/dT are almost constant, irrespective of the alkali content. It is suggested that Electronic Polarizability has an important contribution on thermo-optic coefficients, but the contribution of volume thermal expansion on thermo-optic coefficients cannot be ignored. In the analyses of Electronic polarizabilities of alkali tellurite glasses, the concept of group optical basicity for TeO3 and TeO4 structural units is also applied. It is explained that large thermo-optic coefficients in Li2O–TeO2 and Na2O–TeO2 glasses are composed of oxides having small average single bond strengths and large optical basicities.
Tsuyoshi Honma - One of the best experts on this subject based on the ideXlab platform.
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A review: A new insight for Electronic Polarizability and chemical bond strength in Bi2O3-based glasses
Journal of Non-Crystalline Solids, 2020Co-Authors: Takayuki Komatsu, Vesselin Dimitrov, Tina Tasheva, Tsuyoshi HonmaAbstract:Abstract Bismuth oxide (Bi2O3)-based glasses showing outstanding properties such as high linear refractive indices, low glass transition temperatures, and high third-order nonlinear optical susceptibilities are promising materials for low temperature melting and photonic device applications. The present article reviews the current status of the Electronic Polarizability in Bi2O3-based glasses with glass-forming oxides and modifiers through the refractive index-based optical basicity Λ(no) and interionic interaction parameter A(no) in to understand deeply the uniqueness of Bi2O3-based glasses among other oxide glasses. The values of Λ(no), and A(no) in some Bi2O3-based glasses were estimated newly in this article. It was clarified that Bi2O3-based glasses exhibit an extremely strong basic nature with Λ(no)∼1.15 and extremely weak chemical bond strength with A(no)∼0.01 A−3 among oxide glasses, being more basic compared with TeO2-based glasses with Λ(no)∼1.0 and A(no)∼0.03 A−3. The outstanding properties of Bi2O3-based glasses were discussed from the viewpoints of Electronic Polarizability and weak chemical bond strength.
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Electronic Polarizability and interaction parameter of gadolinium tungsten borate glasses with high WO 3 content
Journal of Solid State Chemistry, 2014Co-Authors: Yukina Taki, Tsuyoshi Honma, Vesselin Dimitrov, Kenji Shinozaki, Takayuki KomatsuAbstract:Abstract Glasses with the compositions of 25Gd 2 O 3 – x WO 3 –(75− x )B 2 O 3 with x =25–65 were prepared by using a conventional melt quenching method, and their Electronic polarizabilities, optical basicities Λ ( n o ), and interaction parameters A ( n o ) were estimated from density and refractive index measurements in order to clarify the feature of Electronic Polarizability and bonding states in the glasses with high WO 3 contents. The optical basicity of the glasses increases monotonously with the substitution of WO 3 for B 2 O 3 , and contrary the interaction parameter decreases monotonously with increasing WO 3 content. A good linear correlation was observed between Λ ( n o ) and A ( n o ) and between the glass transition temperature and A ( n o ). It was proposed that Gd 2 O 3 oxide belongs to the category of basic oxide with a value of A ( n o )=0.044 A −3 as similar to WO 3 . The relationship between the glass formation and Electronic Polarizability in the glasses was discussed, and it was proposed that the glasses with high WO 3 and Gd 2 O 3 contents would be a floppy network system consisting of mainly basic oxides.
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Temperature dependence of refractive index and Electronic Polarizability of RO–TeO2 glasses (R=Mg, Ba, Zn)
Solid State Sciences, 2012Co-Authors: Takayuki Komatsu, Tsuyoshi Honma, Noriko Ito, Vesselin DimitrovAbstract:The refractive indices (n) and densities (ρ) of xRO − (100 − x)TeO2 glasses (R = Mg, Ba, and Zn) with x = 10–40 are measured in the temperature range of 50–150 °C in order to clarify thermo-optic coefficients (dn/dT) and the temperature dependence of the Electronic Polarizability of oxide ions (αO2−) and optical basicity (Λ). It is found that the values of n, αO2−, and Λ increase almost linearly with increasing temperature. The values of dn/dT are between 7.32 and 9.69 × 10−5 K−1 and tend to decrease with increasing RO content. Contrary, the values of ⅆαO2−/ⅆT and dΛ/dT are almost constant irrespective of RO content. It is suggested that the Electronic Polarizability has an important contribution on thermo-optic coefficients, but the contribution of volume thermal expansion on thermo-optic coefficients is not ignored. In the analyses of Electronic polarizabilities of RO–TeO2 glasses, the concept of group optical basicity for TeO3 and TeO4 structural units is also applied. It is explained that large thermo-optic coefficients in RO–TeO2 glasses are composed of oxides having small average single bond strengths and large optical basicities.
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approach to thermal properties and Electronic Polarizability from average single bond strength in znobi2o3b2o3 glasses
Journal of Solid State Chemistry, 2010Co-Authors: Taisuke Inoue, Tsuyoshi Honma, Vesselin Dimitrov, Takayuki KomatsuAbstract:The glass transition temperature (T{sub g}), density, refractive index, Raman scattering spectra, and X-ray photoelectron spectra (XPS) for xZnO-yBi{sub 2}O{sub 3}-zB{sub 2}O{sub 3} glasses (x=10-65, y=10-50, z=25-60 mol%) are measured to clarify the bonding and structure features of the glasses with large amounts of ZnO. The average Electronic Polarizability of oxide ions ({alpha}{sub O2-}) and optical basicity ({Lambda}) of the glasses estimated using Lorentz-Lorenz equation increase with increasing ZnO or Bi{sub 2}O{sub 3} content, giving the values of {alpha}{sub O2-}=1.963 A{sup 3} and {Lambda}=0.819 for 60ZnO-10Bi{sub 2}O{sub 3}-30B{sub 2}O{sub 3} glass. The formation of B---O---Bi and B---O---Zn bridging bonds in the glass structure is suggested from Raman and XPS spectra. The average single bond strength (B{sub M---O}) proposed by Dimitrov and Komatsu is applied to the glasses and is calculated using single bond strengths of 150.6 kJ/mol for Zn---O bonds in ZnO{sub 4} groups, 102.5 kJ/mol for Bi---O bonds in BiO{sub 6} groups, 498 kJ/mol for B---O bonds in BO{sub 3} groups, and 373 kJ/mol for B---O bonds in BO{sub 4} groups. Good correlations are observed between T{sub g} and B{sub M---O}, {Lambda} and B{sub M---O}, and T{sub g} and {Lambda}, proposing that the average single bond strength is amore » good parameter for understanding thermal and optical properties of ZnO---Bi{sub 2}O{sub 3}---B{sub 2}O{sub 3} glasses. -- Graphical abstract: This figure shows the correlation between optical basicity {Lambda} and average single bond strength B{sub M---O} in ZnO---Bi{sub 2}O{sub 3}---B{sub 2}O{sub 3} glasses. A good correlation is observed, proposing that the average single bond strength is a good parameter for understanding optical properties of ZnO---Bi{sub 2}O{sub 3}---B{sub 2}O{sub 3} glasses. Display Omitted« less
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thermo optic properties and Electronic Polarizability in alkali tellurite glasses
Journal of the American Ceramic Society, 2010Co-Authors: Tsuyoshi Honma, Noriko Ito, Takayuki Komatsu, Vesselin DimitrovAbstract:The refractive indices (n) and densities (ρ) of xLi2O–(100−x)TeO2 glasses with x=15–30 and xNa2O–(100−x)TeO2 glasses with x=10–20 are measured in the temperature range of 30°–150°C in order to clarify thermo-optic coefficients (dn/dT) and the temperature dependence of the Electronic Polarizability of oxide ions () and optical basicity (Λ). It is found that the values of n, , and Λ increase almost linearly with increasing temperature. The values of dn/dT are around 7 × 10−5 K−1 and tend to decrease with increasing alkali content (Li2O, Na2O). In contrast, the values of d/dT and dΛ/dT are almost constant, irrespective of the alkali content. It is suggested that Electronic Polarizability has an important contribution on thermo-optic coefficients, but the contribution of volume thermal expansion on thermo-optic coefficients cannot be ignored. In the analyses of Electronic polarizabilities of alkali tellurite glasses, the concept of group optical basicity for TeO3 and TeO4 structural units is also applied. It is explained that large thermo-optic coefficients in Li2O–TeO2 and Na2O–TeO2 glasses are composed of oxides having small average single bond strengths and large optical basicities.
S.k. Rathi - One of the best experts on this subject based on the ideXlab platform.
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an empirical model for dielectric constant and Electronic Polarizability of binary anb8 n and ternary anb2 nc27 n tetrahedral semiconductors
Journal of Alloys and Compounds, 2009Co-Authors: Ajay Singh Verma, R.k. Singh, S.k. RathiAbstract:Abstract An overview of the understanding of correlation between valence electron and the optical properties of binary (ANB8−N) and ternary (ANB2+NC27−N) tetrahedral semiconductors is presented here. We have presented two expressions relating the dielectric constant and Electronic Polarizability for the transition metal chalcogenides and pnictides (AIIBVI and AIIIBV) and chalcopyrites (AIBIIIC2VI and AIIBIVC2V) with the product of valence electrons and nearest neighbour distance d (A). The dielectric constant and Electronic Polarizability of these solids exhibit a linear relationship when plotted on a log–log scale against the nearest neighbour distance d (A), but fall on different straight lines according to the valence electron product of the compounds. We have applied the proposed relation on these solids and found a better agreement with the experimental data as compared to the values evaluated by earlier researchers.
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An empirical model for dielectric constant and Electronic Polarizability of binary (ANB8−N) and ternary (ANB2+NC27−N) tetrahedral semiconductors
Journal of Alloys and Compounds, 2009Co-Authors: Ajay Singh Verma, R.k. Singh, S.k. RathiAbstract:Abstract An overview of the understanding of correlation between valence electron and the optical properties of binary (ANB8−N) and ternary (ANB2+NC27−N) tetrahedral semiconductors is presented here. We have presented two expressions relating the dielectric constant and Electronic Polarizability for the transition metal chalcogenides and pnictides (AIIBVI and AIIIBV) and chalcopyrites (AIBIIIC2VI and AIIBIVC2V) with the product of valence electrons and nearest neighbour distance d (A). The dielectric constant and Electronic Polarizability of these solids exhibit a linear relationship when plotted on a log–log scale against the nearest neighbour distance d (A), but fall on different straight lines according to the valence electron product of the compounds. We have applied the proposed relation on these solids and found a better agreement with the experimental data as compared to the values evaluated by earlier researchers.
Ajay Singh Verma - One of the best experts on this subject based on the ideXlab platform.
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Electronic Polarizability of compound semiconductors
Journal of Computational Methods in Sciences and Engineering, 2010Co-Authors: Ajay Singh Verma, Sheetal Sharma, V. K. JindalAbstract:In this paper we present a new expression relating the Electronic Polarizability ($α_{e}$) in terms of ionic charge (Z), melting temperature (T$_{m}$) and mean atomic volume (Ω) for zinc blende (A$^{II}$B$^{VI}$ and A$^{III}$B$^{V}$) structured solids. The Electronic Polarizability of these solids exhibit a linear relationship when plotted against the k$_{B}$T$_{m}$/Ω (k$_{B}$= Boltzmann's constant), but fall on different straight lines according to the product of the ionic charge of the compounds. We have applied the proposed relation on these solids and found a better agreement with the experimental data as compared to the values evaluated by earlier researchers.
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an empirical model for dielectric constant and Electronic Polarizability of binary anb8 n and ternary anb2 nc27 n tetrahedral semiconductors
Journal of Alloys and Compounds, 2009Co-Authors: Ajay Singh Verma, R.k. Singh, S.k. RathiAbstract:Abstract An overview of the understanding of correlation between valence electron and the optical properties of binary (ANB8−N) and ternary (ANB2+NC27−N) tetrahedral semiconductors is presented here. We have presented two expressions relating the dielectric constant and Electronic Polarizability for the transition metal chalcogenides and pnictides (AIIBVI and AIIIBV) and chalcopyrites (AIBIIIC2VI and AIIBIVC2V) with the product of valence electrons and nearest neighbour distance d (A). The dielectric constant and Electronic Polarizability of these solids exhibit a linear relationship when plotted on a log–log scale against the nearest neighbour distance d (A), but fall on different straight lines according to the valence electron product of the compounds. We have applied the proposed relation on these solids and found a better agreement with the experimental data as compared to the values evaluated by earlier researchers.
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An empirical model for dielectric constant and Electronic Polarizability of binary (ANB8−N) and ternary (ANB2+NC27−N) tetrahedral semiconductors
Journal of Alloys and Compounds, 2009Co-Authors: Ajay Singh Verma, R.k. Singh, S.k. RathiAbstract:Abstract An overview of the understanding of correlation between valence electron and the optical properties of binary (ANB8−N) and ternary (ANB2+NC27−N) tetrahedral semiconductors is presented here. We have presented two expressions relating the dielectric constant and Electronic Polarizability for the transition metal chalcogenides and pnictides (AIIBVI and AIIIBV) and chalcopyrites (AIBIIIC2VI and AIIBIVC2V) with the product of valence electrons and nearest neighbour distance d (A). The dielectric constant and Electronic Polarizability of these solids exhibit a linear relationship when plotted on a log–log scale against the nearest neighbour distance d (A), but fall on different straight lines according to the valence electron product of the compounds. We have applied the proposed relation on these solids and found a better agreement with the experimental data as compared to the values evaluated by earlier researchers.
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An empirical relationship between ionic charge and the Electronic Polarizability of binary and ternary tetrahedral semiconductors
Physica Scripta, 2009Co-Authors: Ajay Singh VermaAbstract:In this paper, we present an empirical expression relating to the Electronic Polarizability α (A3) for binary and ternary tetrahedral semiconductors with the product of ionic charges (Z1 and Z2) and nearest-neighbor distance d (A). The Electronic Polarizability of these compounds exhibits a linear relationship when plotted on a log–log scale against the nearest-neighbor distance d (A), but falls on different straight lines according to the ionic charge product of the compounds. We have applied the proposed relation to zinc blende and complex structured solids and found a better agreement with experimental data compared to the values evaluated by earlier researchers.