Influence of Yb-doping on the thermoelectric properties of Pb_{1鈭?span style='font-style: italic'>x}Yb_xTe alloy synthesized using solid-state microwave

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• 作者：A. Hmood ; ^{Arshad.phy73@gmail.com} ; A. Kadhim ; H. Abu Hassan
• 关键词：Thermoelectric materials ; Thin films ; Microstructure ; Electrical transport
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 April, 2012
• 卷：520
• 期：Complete
• 页码：1-6
• 文件大小：1530 K

摘要

The semi-magnetic semiconductor thermoelectric alloy Pb_1鈭?em>xYb_xTe (0.0 > x < 0.075) was synthesized by solid-state microwave. Polycrystalline was prepared by high-purity powders for the three elements Pb, Yb, and Te from microwave irradiation-induced equilibrium reaction of initial components to obtain ingots with a large grain size. The morphology of the microstructure and polycrystalline stoichiometric ratio for these ingots was performed using scanning electron microscopy (SEM) and energy dispersive X-ray spectra (EDX). High-quality polycrystalline thin films of Pb_1鈭?em>xYb_xTe were deposited onto clean glass substrates using the vacuum evaporation technique at 10^鈭? mbar. The structures of the polycrystalline powders and thin films were examined by X-ray diffraction (XRD) patterns. A rock salt structure was observed, and the lattice constant increased with increasing amount of Yb, but not in accordance with Vegard's law. The thermoelectric properties were measured at a temperature range of 298-523 K. Carrier concentrations of the films were determined using Hall effect measurements at 300 K.