CAJ | 학술논문

采用简单的自燃法, 以去离子水为溶剂, 柠檬酸为螯合剂, 硝酸盐为原料制备了金属钠掺杂的(Na_xCa_(1-x))_3Co_4O_9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, 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温度区间内, 测试了材料的电阻率和Seebeck系数.研究表明,试样(x=0.15)在973K时的电阻率可达ρ=5.899mΩ·cm,Seebeck系数S=185μV/K,热电转换功率因子值p=5.802×10~(-6)W/(m·K2).
채용간단적자연법, 이거리자수위용제, 저몽산위오합제, 초산염위원료제비료금속납참잡적(Na_xCa_(1-x))_3Co_4O_9열전재료전구분.전구분경단소、구마、냉압、소결등공예획득괴체재료.통과X사선연사, 소묘전경관찰등방법대양품적결구여형모진행료분석표정.재573～1073K온도구간내, 측시료재료적전조솔화Seebeck계수.연구표명,시양(x=0.15)재973K시적전조솔가체ρ=5.899mΩ·cm,Seebeck계수S=185μV/K,열전전환공솔인자치p=5.802×10~(-6)W/(m·K2).
Na-doped Ca_3Co_4O_9, (Na_xCa_(1-x))_3Co_4O_9 (x=0,0.05,0.1,0.15,0.2), thermoelectric powders have been prepared by a simple self-ignition and calcinations route, using the analytic grade Ca(NO_3)_2·3H_2O, NaNO_3, Co(NO_3)_2·6H_2O were as reagents. The stripy samples were obtained by cold compacting and sintering process after the powders ground by ball milling. The microstructures of the ceramic samples were characterized by using X-ray diffraction and scanning electron microscopy. The electrical resistivities and Seebeck coefficients were studied in the temperature range from 573 to 1073K. The results show that the electrical resistivity (ρ), Seebeck coefficient (S) and power factor (p) of Na-doped (0.15) sample are 5.899mΩ·cm, 185μV/K, and 5.802×10~(-6)W/(m·K~2) at 973K, respectively.