Fe掺杂CuAlO_2的微结构和热电性能的正电子湮没研究  

Positron annihilation study on microstructure and thermoelectric properties of Fe-doped CuAlO_2

作　　者：陈松[1] 唐宇[1] 王选理[1] 韩艳玲[1] 黄宇阳[1] 邓文[1] 

机构地区：[1]广西大学物理科学与工程技术学院,南宁530004

出　　处：《核技术》2010年第7期517-521,共5页Nuclear Techniques

基　　金：国家自然科学基金(10764001);广西自然科学基金(桂科回0832003)资助

摘　　要：测量了CuAl1-xFexO2样品的X射线衍射图、热电性能、符合正电子湮没辐射多谱勒展宽谱和寿命谱。结果表明,在CuAlO2中加入少量的Fe(x≤0.10),样品的正电子湮没辐射多谱勒展宽谱的3d信号增强,正电子S参数、正电子平均寿命和电阻率降低;当Fe含量较高(x>0.10)时,随Fe含量增加,CuAl1-xFexO2样品的正电子湮没辐射多谱勒展宽谱的3d信号降低,正电子S参数、正电子平均寿命和电阻率升高。CuAl1-xFexO2室温Seebeck系数随样品中缺陷浓度升高。讨论了Fe掺杂对CuAlO2微结构和热电性能的影响。The measurements of XRD, thermoelectric properties, positron lifetime and its coincidence Doppler broadening spectra for the samples of CuAl1-xFexO2 （0≤x≤0.20） were performed. The results show that doping the CuAlO2 with small amount of Fe （x〈0.10） enhances the 3d electron signals of positron coincidence Doppler broadening spectra of the sample, and reduces the S parameter and mean lifetime of the positrons, and resistivity of the sample as well, whereas for x〉0.10, the S parameter, and lifetime of positron, and the sample resistivity, increase with the Fe contents, but the 3d electron signal decreases with increasing Fe contents. The Seebeck coefficients of CuAl1-xFexO2 at room temperature increase with defect concentration. The Fe dopant effects on microstructure and thermoelectric properties of CuAlO2 are discussed.

关 键 词：CuAlO2热电性能 3d电子 微观缺陷 正电子湮没 

分 类 号：TB34[一般工业技术—材料科学与工程]