Ba和Y掺杂对Ca_3Co_4O_9热电性能的影响  

Thermoelectric Properties of Ba and Y Doped Ca_3Co_4O_9

作　　者：卢喜凤 郜超军[1] 郭娟[1] 王世举[1] 侯晓强[1] 

机构地区：[1]郑州大学物理工程学院,郑州450001

出　　处：《河南师范大学学报（自然科学版）》2015年第6期35-39,共5页Journal of Henan Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51302249)

摘　　要：采用固态反应法制备了Ca_(3-x)Ba_xCo_4O_9(0.00≤x≤0.20)和Ca_(3-y)Y_yCo_4O_9(0.00≤y≤0.20)热电材料.X射线衍射(XRD)分析结果表明,对于Ba掺杂和Y掺杂,在掺杂范围内,样品为单一的Ca_3Co_4O_9相.在室温至1000K的范围内样品的电阻率和Seebeck系数测量结果显示,用Ba^(2+)替代Ca^(2+)时,随着x的增加,电阻率逐渐减小、Seebeck系数几乎不变;用Y3+替代Ca2+时,Seebeck系数随着y的增加逐渐增大、而电阻率在x等于0.025时最小.当T=1000K时,样品Ca_(2.95_Ba_(0.05)Co_4O_9和Ca_(2.97)5Y_(0.025)Co_4O_9的功率因子与Ca_3Co_4O_9相比都明显提高.Thermoelectric materials Ca3-xBaxCo4O9（0.00≤x≤0.20）and Ca3-yYyCo4O9（0.00≤y≤0.20）were synthesized using solid state reactions.The X-ray diffraction（XRD）patterns revealed that all the samples are single phase.Their thermoelectric properties have been studied from room temperature to 1000 K.Such as with Ba doping,the electricity resistivity decreases gradually and the Seebeck coefficient almost has no change when xchanges.For samples with Y doping,the Seebeck coefficient increases gradually with y,and the electricity resistivity has a minimum value at y equal to 0.025.The power factor of Ca2.95Ba0.05Co4O9 and Ca2.975Y0.025Co4O9 at 1000Kare higher than Ca3Co4O9.

关 键 词：CA3CO4O9 Ba掺杂 Y掺杂 热电性能 

分 类 号：O482[理学—固体物理]