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M. Kranjcec - One of the best experts on this subject based on the ideXlab platform.
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Phase transitions and Optical Absorption Edge in (Cu 6 PS 5 Br) 1-x (Cu 7 PS 6 ) x mixed crystals
Journal of Alloys and Compounds, 2018Co-Authors: I. P. Studenyak, O.p. Kokhan, V. Yu. Izai, V. I. Studenyak, S.o. Rybak, A. I. Pogodin, M. KranjcecAbstract:Abstract (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals were grown by chemical vapour transport. Low-temperature isoAbsorption and polarisation studies of phase transitions (PT) were performed. A second-order PT characterized by appearance of light transmission in the polariser-crystal-analyser system and a typical knee at the isoAbsorption dependence, is clearly revealed. With increasing Cu7PS6 content in (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals, the second-order PT shifts down in temperature range and becomes smeared. Temperature behaviour of the Optical Absorption Edge is studied in the temperature interval 77–320 K. In the superionic phase the Absorption Edge has an exponential shape and a characteristic Urbach bundle is observed. In the vicinity of the second-order PT, a variation of the Urbach Absorption Edge parameters and exciton-phonon interaction is revealed. Influence of compositional disordering on the parameters of the Urbach Absorption Edge, exciton-phonon interaction parameters, and the PT temperatures is studied.
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Optical Absorption Edge in (Ag3AsS3)x(As2S3)1-x superionic glasses
2012Co-Authors: I. P. Studenyak, M. Kranjcec, Hallerova AlejaAbstract:The spectrometric studies of Optical Absorption Edge in x 1 3 2 x 3 3 S As AsS Ag superionic glasses were carried out within the temperature range 77 to 400 K. The influence of temperature and composition on the Optical Absorption Edge, parameters of the Urbach Absorption Edge, parameters of electron-phonon interaction as well as ordering-disordering processes in x 1 3 2 x 3 3 S As AsS Ag superionic glasses are studied.
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temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in cu7ge s1 xsex 5i mixed superionic crystals
Solid State Ionics, 2010Co-Authors: I. P. Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
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Temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in Cu7Ge(S1 − xSex)5I mixed superionic crystals
Solid State Ionics, 2010Co-Authors: Ihor Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
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Specific features of the Optical Absorption Edge anisotropy in In4(P2S6)3 layered crystals
Materials Research Bulletin, 2002Co-Authors: M. Kranjcec, Ihor Studenyak, V. V. Mitrovcij, M. I. Gurzan, Gyula Shandor Kovacs, Yu.v. VoroshilovAbstract:The Optical Absorption Edge of In{sub 4}(P{sub 2}S{sub 6}){sub 3} layered crystals is studied in the temperature range 77-355 K. In the spectral range of direct Optical transitions, the Absorption Edge is of Urbach shape. Electron-phonon interaction result in the smearing of energy bands and, consequently, in appearing of Urbach Absorption tails. The temperature variation of the Optical pseudogap E{sub g}* and the Absorption Edge energy width w are well described in the Einstein model. Strong anisotropy of the Absorption Edge spectral position and shape, as well as of electron-phonon interaction, is revealed.
Tomas Šalkus - One of the best experts on this subject based on the ideXlab platform.
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temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in cu7ge s1 xsex 5i mixed superionic crystals
Solid State Ionics, 2010Co-Authors: I. P. Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
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Temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in Cu7Ge(S1 − xSex)5I mixed superionic crystals
Solid State Ionics, 2010Co-Authors: Ihor Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
O.p. Kokhan - One of the best experts on this subject based on the ideXlab platform.
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Phase transitions and Optical Absorption Edge in (Cu 6 PS 5 Br) 1-x (Cu 7 PS 6 ) x mixed crystals
Journal of Alloys and Compounds, 2018Co-Authors: I. P. Studenyak, O.p. Kokhan, V. Yu. Izai, V. I. Studenyak, S.o. Rybak, A. I. Pogodin, M. KranjcecAbstract:Abstract (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals were grown by chemical vapour transport. Low-temperature isoAbsorption and polarisation studies of phase transitions (PT) were performed. A second-order PT characterized by appearance of light transmission in the polariser-crystal-analyser system and a typical knee at the isoAbsorption dependence, is clearly revealed. With increasing Cu7PS6 content in (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals, the second-order PT shifts down in temperature range and becomes smeared. Temperature behaviour of the Optical Absorption Edge is studied in the temperature interval 77–320 K. In the superionic phase the Absorption Edge has an exponential shape and a characteristic Urbach bundle is observed. In the vicinity of the second-order PT, a variation of the Urbach Absorption Edge parameters and exciton-phonon interaction is revealed. Influence of compositional disordering on the parameters of the Urbach Absorption Edge, exciton-phonon interaction parameters, and the PT temperatures is studied.
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temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in cu7ge s1 xsex 5i mixed superionic crystals
Solid State Ionics, 2010Co-Authors: I. P. Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
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Temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in Cu7Ge(S1 − xSex)5I mixed superionic crystals
Solid State Ionics, 2010Co-Authors: Ihor Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
Ihor Studenyak - One of the best experts on this subject based on the ideXlab platform.
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Temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in Cu7Ge(S1 − xSex)5I mixed superionic crystals
Solid State Ionics, 2010Co-Authors: Ihor Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.
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Specific features of the Optical Absorption Edge anisotropy in In4(P2S6)3 layered crystals
Materials Research Bulletin, 2002Co-Authors: M. Kranjcec, Ihor Studenyak, V. V. Mitrovcij, M. I. Gurzan, Gyula Shandor Kovacs, Yu.v. VoroshilovAbstract:The Optical Absorption Edge of In{sub 4}(P{sub 2}S{sub 6}){sub 3} layered crystals is studied in the temperature range 77-355 K. In the spectral range of direct Optical transitions, the Absorption Edge is of Urbach shape. Electron-phonon interaction result in the smearing of energy bands and, consequently, in appearing of Urbach Absorption tails. The temperature variation of the Optical pseudogap E{sub g}* and the Absorption Edge energy width w are well described in the Einstein model. Strong anisotropy of the Absorption Edge spectral position and shape, as well as of electron-phonon interaction, is revealed.
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Temperature variation of Optical Absorption Edge in Sn2P2S6 and SnP2S6 crystals
Ferroelectrics, 2001Co-Authors: Ihor Studenyak, V. V. Mitrovcij, Gy. Sh. Kovacs, O. A. Mykajlo, M. I. Gurzan, Yu. M. VysochanskiiAbstract:Abstract Temperature variation of the Optical Absorption Edge of Sn2P2S6 ferroelectric with three-dimensional crystalline structure and SnP2S6 layered crystals with 2D structure is studied. In both cases the Urbach shape of the Absorption Edge is revealed, its temperature behaviour in Sn2P2S6 crystal being determined by the presence of a ferroelectric phase transition. In Sn2P2S6 crystals the exponential parts of the Absorption Edge plots both in ferroelectric and paraelectric phases have a common convergence point. The anisotropy of the Urbach Absorption Edge parameters and their temperature variation in the range of the phase transition in Sn2P2S6 is studied. The influence of different types of disordering, including 3D→2D transition, on the Absorption Edge energy position and shape in Sn2P2S6 and SnP2S6 crystals is analyzed.
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Preparation and fundamental Optical Absorption Edge of In4(P2Se6)3 single crystals
Materials Research Bulletin, 1999Co-Authors: M. Kranjcec, Ihor Studenyak, Gy. Sh. Kovacs, I.d. Desnica, M.v. Potory, Yu.v. Voroshilov, V.yu. GebeshAbstract:Abstract Methods of synthesis and growth of good quality, uniaxial In 4 (P 2 Se 6 ) 3 single crystals were developed. The temperature dependence of the Optical Absorption Edge of these crystals was studied at high Absorption levels in the spectral range of direct Optical transitions. At low temperatures, we observed an exciton band corresponding to the Optical Absorption with the formation of direct s -excitons. In the long-wavelength spectral range of the Absorption Edge, Urbach tails were observed. We showed that the exponential dependence of Absorption coefficient on photon energy is a consequence of exciton–phonon interaction, whose mechanism is explained within the framework of Dow–Redfield theory. The influence of disorder on the width of Urbach tails was analyzed as well.
I. P. Studenyak - One of the best experts on this subject based on the ideXlab platform.
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Phase transitions and Optical Absorption Edge in (Cu 6 PS 5 Br) 1-x (Cu 7 PS 6 ) x mixed crystals
Journal of Alloys and Compounds, 2018Co-Authors: I. P. Studenyak, O.p. Kokhan, V. Yu. Izai, V. I. Studenyak, S.o. Rybak, A. I. Pogodin, M. KranjcecAbstract:Abstract (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals were grown by chemical vapour transport. Low-temperature isoAbsorption and polarisation studies of phase transitions (PT) were performed. A second-order PT characterized by appearance of light transmission in the polariser-crystal-analyser system and a typical knee at the isoAbsorption dependence, is clearly revealed. With increasing Cu7PS6 content in (Cu6PS5Br)1-x(Cu7PS6)x mixed crystals, the second-order PT shifts down in temperature range and becomes smeared. Temperature behaviour of the Optical Absorption Edge is studied in the temperature interval 77–320 K. In the superionic phase the Absorption Edge has an exponential shape and a characteristic Urbach bundle is observed. In the vicinity of the second-order PT, a variation of the Urbach Absorption Edge parameters and exciton-phonon interaction is revealed. Influence of compositional disordering on the parameters of the Urbach Absorption Edge, exciton-phonon interaction parameters, and the PT temperatures is studied.
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Optical Absorption Edge in (Ag3AsS3)x(As2S3)1-x superionic glasses
2012Co-Authors: I. P. Studenyak, M. Kranjcec, Hallerova AlejaAbstract:The spectrometric studies of Optical Absorption Edge in x 1 3 2 x 3 3 S As AsS Ag superionic glasses were carried out within the temperature range 77 to 400 K. The influence of temperature and composition on the Optical Absorption Edge, parameters of the Urbach Absorption Edge, parameters of electron-phonon interaction as well as ordering-disordering processes in x 1 3 2 x 3 3 S As AsS Ag superionic glasses are studied.
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Optical Absorption Edge and luminescence in phosphorous-implanted Cu6PS5X (X = I, Br) single crystals
Semiconductor Physics Quantum Electronics and Optoelectronics, 2011Co-Authors: I. P. Studenyak, A. Plecenik, Miroslav Zahoran, J. Greguš, T. RochAbstract:Implantation of Cu6PS5X (X = I, Br) single crystals was carried out for different values of fluence with using P + ions; the energy of ions was 150 keV. For the implanted Cu6PS5X crystals, the structural studies were performed using the scanning electron microscopy technique and energy-dispersive X-ray spectroscopy. Spectrometric studies of Optical Absorption Edge and luminescence were carried out within the temperature range 77…320 K. The influence of ionic implantation on luminescence spectra, parameters of Urbach Absorption Edge, parameters of exciton-phonon interaction as well as ordering-disordering processes in Cu6PS5X (X = I, Br) superionic conductors have been studied.
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temperature and compositional behaviour of electrical conductivity and Optical Absorption Edge in cu7ge s1 xsex 5i mixed superionic crystals
Solid State Ionics, 2010Co-Authors: I. P. Studenyak, M. Kranjcec, V.v. Bilanchuk, O.p. Kokhan, Antanas Feliksas Orliukas, A. Kezionis, Edvardas Kazakevičius, Tomas ŠalkusAbstract:Abstract Electrical and Optical properties of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals, grown by chemical vapour transport, are studied. Compositional dependencies of their electrical conductivity, measured in the frequency range 1.0 ⋅ 10 6 –1.2 ⋅ 10 9 Hz at 100–300 K and the corresponding activation energy, are analysed. The Optical Absorption Edge of Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is studied in the temperature range 77–300 K, the compositional dependencies of the Optical pseudogap and Urbach energy being obtained. The effect of different types of disordering on the Optical Absorption processes at S → Se anionic substitution in the Cu 7 Ge(S 1 − x Se x ) 5 I mixed crystals is investigated.