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Absorption Edge and Optical Band Gap of Ag-As_{40}S_{30}Se_{30} Amorphous Samples

100%
Čajko K., Lukić-Petrović S., Štrbac D.
Acta Physica Polonica A
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2015
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vol. 127
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issue 4
1286-1288
EN
The paper describes the results of a study of the influence of silver content on the absorption edge and optical band gap of the newly synthesized glasses of the Ag_{x}(As_{40}S_{30}Se_{30})_{100-x} type for x=0, 0.5, 1, 2, 3, 5 at.% and of the corresponding films. The synthesis of bulk samples was performed in a rocking furnace from high-purity elemental components by a melt quenching method. Films were prepared from the synthesized bulk samples by pulsed laser deposition. Transmission spectra of the investigated samples were recorded at room temperature. The absorption edge and the optical band gap were determined by extrapolating the linear parts of the absorption spectra. It was found that the investigated range of Ag doping concentrations has a great influence on the absorption edge and optical band gap. Namely, with the increase of the silver content in the material the optical band gap showed a decrease. For films, it decreased from 2.02 eV, for the glass without silver, to 1.805 eV for the composition with 5 at.% Ag, whereas for the analogous bulk samples this decrease was from 1.84 eV to 1.609 eV.
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Kinetic Analysis of Thermal Processes in Ag-As-S-Se System Based on DSC Measurements

100%
Čajko K., Lukić-Petrović S., Štrbac G., Ivetić T.
Acta Physica Polonica A
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2016
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vol. 129
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issue 4
509-513
EN
Thermal properties of glasses from the system Ag_x(As_{40}S_{30}Se_{30})_{100-x} for x=0, 0.5, 1, 3, and 5 at.% were investigated by differential scanning calorimetry. The DSC curves were obtained under non-isothermal conditions which allowed determination of the glass transition temperature T_{g} (onset temperature), crystallization temperature T_{p} (corresponding to the crystallization peak maximum), melting temperature T_{m}, crystallization enthalpy H_{c}, and melting enthalpy H_{m}. The DSC curves obtained at the same heating rate were analyzed in order to study the variation of glass transition temperature with Ag concentration. Observed T_{g} shift toward higher values, with increase in the heating rate, is in agreement with the Lasocka equation. Samples with 3 at.% and 5 at.% Ag were further thermally treated at different heating rates with the aim of analyzing kinetic processes of crystallization. The Moynihan and Kissinger models were used to calculate the activation energy of glass transition and activation energy of crystallization. For the samples that showed the crystallization processes an assessment of the thermal stability was done based on different criteria.
3
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Influence of the Introduction of Copper into Amorphous As_2Se_3 Matrix on Its Thermal and Structural Characteristics

88%
Štrbac G., Lukić-Petrović S., Štrbac D., Čajko K., Turyanytsa I.
Acta Physica Polonica A
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2013
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vol. 123
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issue 2
256-258
EN
This paper describes the results of the determination of some thermal and structural parameters of glasses from the Cu_{x}(As_2Se_3)_{100-x} system for x=0, 1, 5, 10 and 15 at.%. Based on the differential scanning calorimetry curves taken at different heating rates, glass transition temperature T_{g}, onset temperature of crystallization T_{onset}, and melting temperature T_{m} of crystalline units formed are determined. The values of activation energy E_{g} of glass transition process are calculated. These characteristic temperatures served as the basis for the calculation of the parameters of thermal stability of the glasses towards crystallization.
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