研究目的
Investigation of thermal and electrical properties of As–Se glasses modified with Cu using DSC and AC impedance spectroscopy
研究成果
The introduction of copper into the As–Se glass system significantly affects the thermal and electrical properties, increasing the complexity of the structural network and enhancing conductivity. The presence of different polarization processes due to copper modification influences the dielectric properties, with high values of the real part of dielectric permittivity observed at low and medium frequencies. The study provides insights into the structural and electrical behavior of Cu-modified As–Se glasses, suggesting potential applications in optoelectronics.
研究不足
The study is limited to the investigation of thermal and electrical properties of CuxAs50Se50 ? x chalcogenide glasses with x ≤ 15 at%. The interpretation of results is based on the assumption of certain structural models and may not account for all possible structural variations.
1：Experimental Design and Method Selection:
The study involved the synthesis of CuxAs50Se50 ? x chalcogenide glasses using the method of cascade heating from high purity elementary components. The amorphous character of the samples was confirmed with X-ray measurements. Thermal properties were investigated using a differential scanning calorimeter (DSC) in a non-isothermal regime. Electrical properties were determined through DC and AC conductivity measurements and impedance spectroscopy.
2：Sample Selection and Data Sources:
Samples with x = 5, 10, and 15 at% of Cu were prepared. The samples were mechanically polished to obtain plane-parallel plates for electrical measurements.
3：List of Experimental Equipment and Materials:
DSC METTLER TOLEDO 822 differential scanning calorimeter, Novocontrol Concept 90 for DC conductivity measurements, picoammeter Keithley 6517B, LCR Hi-tester Hioki 3522-50 for AC conductivity and dielectric permittivity measurements, SP-200 Biologic device for impedance spectroscopy.
4：Experimental Procedures and Operational Workflow:
DSC measurements were carried out at a heating rate of 10 K/min in the temperature range 23–500°C. DC conductivity was measured at a constant voltage of 1 V in the temperature range from ?160°C up to 120°C. AC conductivity and dielectric permittivity were measured in the temperature range 20–120°C. Impedance spectra were recorded at room temperature in the frequency range of 100 Hz to 1 MHz.
5：Data Analysis Methods:
The data were analyzed using EIS Spectrum Analyzer software for fitting and analysis of the impedance data. The temperature dependence of conductivity was described by the Arrhenius equation.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
