材料科学
烧结
热电效应
塞贝克系数
陶瓷
电阻率和电导率
粒度
活化能
兴奋剂
分析化学(期刊)
冶金
复合材料
热导率
物理化学
热力学
光电子学
电气工程
化学
工程类
物理
色谱法
作者
Yi-Cheng Liou,Wen-Chou Tsai,Jian-Yi Yu,Hsiao-Chun Tsai
标识
DOI:10.1016/j.ceramint.2015.01.157
摘要
New thermoelectric ceramics Sr2Nb2−xTixO7 prepared by a reaction-sintering process were investigated. The calcinations and subsequent pulverization stages were bypassed. Dense Sr2Nb2O7 with 5.15 g cm−3 (97.9% of the theoretical density) was observed after 1400 °C/6 h sintering. Grain size decreased as Ti was doped into Sr2Nb2O7 ceramics. Resistivity of Sr2Nb2O7 is 3.07×108 Ω cm at 200 °C and decreased to 4.77×104 Ω cm at 700 °C. Activation energy Ea for Sr2Nb2O7 is 0.7 eV at 200–700 °C. Ea for Sr2Nb1.97Ti0.03O7 and Sr2Nb1.95Ti0.05O7 increased from 0.23–0.4 eV at 200–400 °C to 0.77 eV at 400–700 °C. For Sr2Nb2O7, Seebeck coefficient S=26.93 μV K−1 at 200 °C and increased to 57.15 μV K−1 at 500 °C. For Sr2Nb1.97Ti0.03O7, S=25.57 μV K−1 at 200 °C and it increased to 50.21 μV K−1 at 500 °C.
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