CAJ | 학술논문

以柠檬酸为螯合剂,各种硝酸盐为原料,采用简单的自燃法制备了金属Bi掺杂的N型钙钛矿结构的La_(1-x)Bi_xNiO_3(x=0、0.025、0.05、0.075、0.1、0.15)热电材料前驱粉.前驱粉经煅烧、球磨、冷压、烧结等工艺获得块体材料.通过X射线衍射和扫描电镜观察等方法对样品的结构与形貌进行了分析表征.在573～1073K内测试了材料的电阻率和Seebeck系数,结果表明,该材料显示了较好的热电性能,掺杂Bi有助于显著降低材料的电阻率,优化材料的热电性能,其中试样La_(0.9)Bi_(0.1)NiO_3组分材料在973K时的电阻率ρ=3.9606mΩ·cm,Seebeck系数S=-29.253μV/K,热电转换功率因子值p=2.16×10~(-5)W/(m·K~2).
이저몽산위오합제,각충초산염위원료,채용간단적자연법제비료금속Bi참잡적N형개태광결구적La_(1-x)Bi_xNiO_3(x=0、0.025、0.05、0.075、0.1、0.15)열전재료전구분.전구분경단소、구마、냉압、소결등공예획득괴체재료.통과X사선연사화소묘전경관찰등방법대양품적결구여형모진행료분석표정.재573～1073K내측시료재료적전조솔화Seebeck계수,결과표명,해재료현시료교호적열전성능,참잡Bi유조우현저강저재료적전조솔,우화재료적열전성능,기중시양La_(0.9)Bi_(0.1)NiO_3조분재료재973K시적전조솔ρ=3.9606mΩ·cm,Seebeck계수S=-29.253μV/K,열전전환공솔인자치p=2.16×10~(-5)W/(m·K~2).
Perovskite La_(1-x)Bi_xNiO_3(x=0,0.025,0.05,0.075,0.1,0.15)thermoelectric powders have been prepared by a simple self-ignition and calcinations route,using the analytic grade La(NO_3)_3·6H_2O,Bi(NO_3)_3·6H_2O,Ni(NO_3)_3·5H_2O as reagents.The citric acid is used as chelating agent.The stripy samples are obtained by cold compacting and sintering process after the powders ground by ball milling.The microstructures of the ceramic samples are characterized by X-ray diffraction and scanning electron microscopy.The electrical resistivities and Seebeck coefficients are studied at the temperature ranging from 573K to 1073K.The results show that the materials display favorable thermoelectric properties;the electrical resistivity decreases significantly by Bi-doped method;the material thermoelectric properties are optimized obviously;the electrical resistivity(ρ),Seebeck coefficient(S) and power factor(p)of Bi-doped(0.1) sample are 3.9606mΩ·cm,-29.253μV/K,and 2.16×10 ~(-5)W/(m·K~2)at 973K,respectively.