Novel hexagonal rods and characterization of Bi_0.4Sb_1.6Se_3xTe_{3(1 鈭?#xa0;x)} using solid-state microwave synthesis

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• 作者：A. Kadhim ; ^{areejkadhim@yahoo.com} ; A. Hmood ; H. Abu Hassan
• 关键词：Crystal structure ; Defects ; Electrical properties ; X-ray techniques
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 August, 2012
• 卷：81
• 期：Complete
• 页码：31-33
• 文件大小：744 K

摘要

Novel hexagonal rods of Bi_0.4Sb_1.6Se_3xTe_{3(1 鈭?#xA0;x)} (0.0 鈮?#xA0;x 鈮?#xA0;1.0) were synthesized successfully through solid-state microwave synthesis. These hexagonal rods were explored using field emission scanning electron microscopy and transmission electron microscopy images. The X-ray diffraction results indicate that the powders (0.0 鈮?#xA0;x 鈮?#xA0;0.8) can be indexed as the rhombohedral phase, whereas the sample with x = 1.0 has an orthorhombic phase structure. The hole concentration gradually decreases as Se increased, resulting in a decrease in electrical conductivity and an increase in the Seebeck coefficient. Ascribing to the increased Seebeck coefficient for the sample with x = 0.8, the maximum power factor is 7.47 mW/mK² at 373 K.