Origin of Carrier-Type Reversal in Pb−Ge−Se Glasses: A Detailed Thermal, Electrical, and Structural Study§
Origin of Carrier-Type Reversal in Pb−Ge−Se Glasses: A Detailed Thermal, Electrical, and Structural Study§
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Pb−Ge−Se 玻璃中载流子类型反转的起源：详细的热、电和结构研究§
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
K. Rao
中科院分区：
文献类型：
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作者：
B. Vaidhyanathan;S. Murugavel;S. Asokan;K. Rao
半导体玻璃中的载流子类型反转(CTR)是玻璃科学中一个长期而重要的问题。这一现象在PbGe−−Se玻璃中也表现出来。这里通过进行详细的电学、热学和光谱学研究来解决这个问题。采用两步熔融冷却法制备了PbxGe42-xSe58(x=0−20)玻璃，并用X射线衍射仪、高分辨电子显微镜和X射线能谱分析对其进行了表征。测量了热电阻率和高压电阻率。用红外光谱、拉曼光谱和X射线近边吸收光谱研究了玻璃的结构，用差示扫描量热法(DSC)研究了玻璃的热性能。已经提出了一个基于组分化学性质的结构模型来解释这些玻璃的观察到的性质。铅掺杂对局域结构的影响以及对能带结构的定性影响。
A long-standing and important problem in glass science has been carrier-type reversal (CTR) in semiconducting glasses. This phenomenon is exhibited by Pb−Ge−Se glasses also. It has been addressed here by carrying out detailed electrical, thermal, and spectroscopic investigations. PbxGe42-xSe58 (x = 0−20) glasses were prepared by a two stage melt-quenching process and characterized using x-ray diffraction, high-resolution electron microscropy, and energy dispersive analysis of x-rays. Thermoelectric power and high-pressure electrical resistivity have been measured. IR, Raman, and X-ray adsorption near edge structure spectroscopies have been used for examining the glass structures as well as differential scanning calorimetry (DSC) for studying the thermal properties. A structural model based on the chemical nature of the constituents has been proposed to account for the observed properties of these glasses. Effect of Pb incorporation on local structures and qualitative consequences on the energy band struct...