The Experts below are selected from a list of 162 Experts worldwide ranked by ideXlab platform
M. Rekas - One of the best experts on this subject based on the ideXlab platform.
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Defect Chemistry of (La,Sr)MnO3
Journal of the American Ceramic Society, 2005Co-Authors: Janusz Nowotny, M. RekasAbstract:Defect-disorder models are derived for undoped and strontium-doped LaMnO3. A Random-Defect model and a cluster-Defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The Defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical-conductivity data. A good agreement between the Random-Defect model and the experimental data is shown.
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Defect chemistry and electrical properties of La1−xSrxCoO3−δ III. Oxygen nonstoichiometry
Ionics, 2001Co-Authors: Tadeusz Bak, Janusz Nowotny, M. Rekas, Simon P. Ringer, Charles C. SorrellAbstract:This paper concerns verification of the Defect chemistry models of La1−xSrxCoO3−δ (LSC), involving the Random Defect model and the cluster Defect model, against empirical data of oxygen nonstoichiometry. It appears that the experimental data may well be explained within the Random Defect model.
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Defect chemistry and electrical properties of La1−xSrxCoO3−δ IV. Electrical properties
Ionics, 2001Co-Authors: Tadeusz Bak, Janusz Nowotny, M. Rekas, Simon P. Ringer, Charles C. SorrellAbstract:This paper considers electrical properties of La1−xSrxCoO3−δ in terms of Defect models, such as Random Defect model and the cluster model. It is shown that the experimental data of the electrical conductivity may be explained in terms of the Random Defect model rather than the cluster model.
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Defect chemistry and electrical properties of La1-xSrxCoO3-δ
Ionics, 2001Co-Authors: Tadeusz Bak, Janusz Nowotny, M. Rekas, Simon P. Ringer, Charles C. SorrellAbstract:This paper considers Defect chemistry models of La1−xSrxCoO3−δ, such as Random Defect model and the cluster Defect model. These models are considered in terms of Defect equilibria with respect to (i) the formation of oxygen vacancies, (ii) intrinsic electronic ionisation and (iii) the formation of Defect clusters. The Defect models are derived using the available data of nonstoichiometry for the LSC materials.
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Defect chemistry of (La,Sr)MnO{sub 3}
Journal of the American Ceramic Society, 1998Co-Authors: J. Nowotny, M. RekasAbstract:Defect-disorder models are derived for undoped and strontium-doped LaMnO{sub 3}. A Random-Defect model and a cluster-Defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The Defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical-conductivity data. A good agreement between the Random-Defect model and the experimental data is shown. Lanthanum manganite, LaMnO{sub 3}, and its solid solutions with strontium are well known as mixed conductors and have been widely applied as electrode materials for electrochemical devices such as solid oxide fuel cells.
Kenneth B. Wagener - One of the best experts on this subject based on the ideXlab platform.
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Random, Defect-Free Ethylene/Vinyl Halide Model Copolymers via Condensation Polymerization
Macromolecules, 2008Co-Authors: Emine Boz, Ion Ghiviriga, Alexander J. Nemeth, Keesu Jeon, Rufina G. Alamo, Kenneth B. WagenerAbstract:The synthesis of ethylene vinyl halide (EVH) copolymers containing fluorine, chlorine, and bromine via the ADMET copolymerization of halogen containing α−ω-dienes with 1,9-decadiene is presented. The statistically Random nature of the copolymers was established from their 13C NMR spectra. Thermal analysis via differential scanning calorimetry points to a distinct difference in the crystallization behavior of these Random copolymers when compared to their compositionally matched precise analogues. In this case, sharp melting peaks typical of homopolymer-like crystallization of the precise analogues are no longer observed in Cl- and Br-based Random copolymers and are replaced by broader peaks indicating a mechanism based on the selection of long crystallizable sequences. The results presented herein thus point to the utility of these Random ADMET copolymers as suitable models for industrially relevant PE copolymers based on the perfectly linear, Defect-free, and statistically Random copolymer composition.
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Random Defect free ethylene vinyl halide model copolymers via condensation polymerization
Macromolecules, 2008Co-Authors: Emine Boz, Ion Ghiviriga, Alexander J. Nemeth, Keesu Jeon, Rufina G. Alamo, Kenneth B. WagenerAbstract:The synthesis of ethylene vinyl halide (EVH) copolymers containing fluorine, chlorine, and bromine via the ADMET copolymerization of halogen containing α−ω-dienes with 1,9-decadiene is presented. The statistically Random nature of the copolymers was established from their 13C NMR spectra. Thermal analysis via differential scanning calorimetry points to a distinct difference in the crystallization behavior of these Random copolymers when compared to their compositionally matched precise analogues. In this case, sharp melting peaks typical of homopolymer-like crystallization of the precise analogues are no longer observed in Cl- and Br-based Random copolymers and are replaced by broader peaks indicating a mechanism based on the selection of long crystallizable sequences. The results presented herein thus point to the utility of these Random ADMET copolymers as suitable models for industrially relevant PE copolymers based on the perfectly linear, Defect-free, and statistically Random copolymer composition.
Emine Boz - One of the best experts on this subject based on the ideXlab platform.
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Random, Defect-Free Ethylene/Vinyl Halide Model Copolymers via Condensation Polymerization
Macromolecules, 2008Co-Authors: Emine Boz, Ion Ghiviriga, Alexander J. Nemeth, Keesu Jeon, Rufina G. Alamo, Kenneth B. WagenerAbstract:The synthesis of ethylene vinyl halide (EVH) copolymers containing fluorine, chlorine, and bromine via the ADMET copolymerization of halogen containing α−ω-dienes with 1,9-decadiene is presented. The statistically Random nature of the copolymers was established from their 13C NMR spectra. Thermal analysis via differential scanning calorimetry points to a distinct difference in the crystallization behavior of these Random copolymers when compared to their compositionally matched precise analogues. In this case, sharp melting peaks typical of homopolymer-like crystallization of the precise analogues are no longer observed in Cl- and Br-based Random copolymers and are replaced by broader peaks indicating a mechanism based on the selection of long crystallizable sequences. The results presented herein thus point to the utility of these Random ADMET copolymers as suitable models for industrially relevant PE copolymers based on the perfectly linear, Defect-free, and statistically Random copolymer composition.
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Random Defect free ethylene vinyl halide model copolymers via condensation polymerization
Macromolecules, 2008Co-Authors: Emine Boz, Ion Ghiviriga, Alexander J. Nemeth, Keesu Jeon, Rufina G. Alamo, Kenneth B. WagenerAbstract:The synthesis of ethylene vinyl halide (EVH) copolymers containing fluorine, chlorine, and bromine via the ADMET copolymerization of halogen containing α−ω-dienes with 1,9-decadiene is presented. The statistically Random nature of the copolymers was established from their 13C NMR spectra. Thermal analysis via differential scanning calorimetry points to a distinct difference in the crystallization behavior of these Random copolymers when compared to their compositionally matched precise analogues. In this case, sharp melting peaks typical of homopolymer-like crystallization of the precise analogues are no longer observed in Cl- and Br-based Random copolymers and are replaced by broader peaks indicating a mechanism based on the selection of long crystallizable sequences. The results presented herein thus point to the utility of these Random ADMET copolymers as suitable models for industrially relevant PE copolymers based on the perfectly linear, Defect-free, and statistically Random copolymer composition.
Janusz Nowotny - One of the best experts on this subject based on the ideXlab platform.
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Defect Chemistry of (La,Sr)MnO3
Journal of the American Ceramic Society, 2005Co-Authors: Janusz Nowotny, M. RekasAbstract:Defect-disorder models are derived for undoped and strontium-doped LaMnO3. A Random-Defect model and a cluster-Defect model are both considered within the regimes that correspond to oxygen deficit and oxygen excess. The models are constructed based on the experimental nonstoichiometry data that was reported by previous researchers. According to both models, the addition of strontium leads to an increase of the concentration of electron holes and oxygen nonstoichiometry. The Defect clusters that are predicted by the cluster model have a marked concentration only at very low oxygen partial pressures. Both models are verified against the electrical-conductivity data. A good agreement between the Random-Defect model and the experimental data is shown.
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Defect chemistry and electrical properties of La1−xSrxCoO3−δ III. Oxygen nonstoichiometry
Ionics, 2001Co-Authors: Tadeusz Bak, Janusz Nowotny, M. Rekas, Simon P. Ringer, Charles C. SorrellAbstract:This paper concerns verification of the Defect chemistry models of La1−xSrxCoO3−δ (LSC), involving the Random Defect model and the cluster Defect model, against empirical data of oxygen nonstoichiometry. It appears that the experimental data may well be explained within the Random Defect model.
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Defect chemistry and electrical properties of La1−xSrxCoO3−δ IV. Electrical properties
Ionics, 2001Co-Authors: Tadeusz Bak, Janusz Nowotny, M. Rekas, Simon P. Ringer, Charles C. SorrellAbstract:This paper considers electrical properties of La1−xSrxCoO3−δ in terms of Defect models, such as Random Defect model and the cluster model. It is shown that the experimental data of the electrical conductivity may be explained in terms of the Random Defect model rather than the cluster model.
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Defect chemistry and electrical properties of La1-xSrxCoO3-δ
Ionics, 2001Co-Authors: Tadeusz Bak, Janusz Nowotny, M. Rekas, Simon P. Ringer, Charles C. SorrellAbstract:This paper considers Defect chemistry models of La1−xSrxCoO3−δ, such as Random Defect model and the cluster Defect model. These models are considered in terms of Defect equilibria with respect to (i) the formation of oxygen vacancies, (ii) intrinsic electronic ionisation and (iii) the formation of Defect clusters. The Defect models are derived using the available data of nonstoichiometry for the LSC materials.
Alexander J. Nemeth - One of the best experts on this subject based on the ideXlab platform.
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Random, Defect-Free Ethylene/Vinyl Halide Model Copolymers via Condensation Polymerization
Macromolecules, 2008Co-Authors: Emine Boz, Ion Ghiviriga, Alexander J. Nemeth, Keesu Jeon, Rufina G. Alamo, Kenneth B. WagenerAbstract:The synthesis of ethylene vinyl halide (EVH) copolymers containing fluorine, chlorine, and bromine via the ADMET copolymerization of halogen containing α−ω-dienes with 1,9-decadiene is presented. The statistically Random nature of the copolymers was established from their 13C NMR spectra. Thermal analysis via differential scanning calorimetry points to a distinct difference in the crystallization behavior of these Random copolymers when compared to their compositionally matched precise analogues. In this case, sharp melting peaks typical of homopolymer-like crystallization of the precise analogues are no longer observed in Cl- and Br-based Random copolymers and are replaced by broader peaks indicating a mechanism based on the selection of long crystallizable sequences. The results presented herein thus point to the utility of these Random ADMET copolymers as suitable models for industrially relevant PE copolymers based on the perfectly linear, Defect-free, and statistically Random copolymer composition.
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Random Defect free ethylene vinyl halide model copolymers via condensation polymerization
Macromolecules, 2008Co-Authors: Emine Boz, Ion Ghiviriga, Alexander J. Nemeth, Keesu Jeon, Rufina G. Alamo, Kenneth B. WagenerAbstract:The synthesis of ethylene vinyl halide (EVH) copolymers containing fluorine, chlorine, and bromine via the ADMET copolymerization of halogen containing α−ω-dienes with 1,9-decadiene is presented. The statistically Random nature of the copolymers was established from their 13C NMR spectra. Thermal analysis via differential scanning calorimetry points to a distinct difference in the crystallization behavior of these Random copolymers when compared to their compositionally matched precise analogues. In this case, sharp melting peaks typical of homopolymer-like crystallization of the precise analogues are no longer observed in Cl- and Br-based Random copolymers and are replaced by broader peaks indicating a mechanism based on the selection of long crystallizable sequences. The results presented herein thus point to the utility of these Random ADMET copolymers as suitable models for industrially relevant PE copolymers based on the perfectly linear, Defect-free, and statistically Random copolymer composition.
