摘要
利用溶胶凝胶法制备出(Ca_(0.96)D_(0.04))MnO_3(D=Ca,Sr,Rb,Sm)氧化物粉末后,先分别采用氩气气氛的放电等离子烧结和空气气氛的常压烧结制备出CaMnO_3(CMO)块体,并对其进行相组成分析,选择出更为优异的CaMnO3块体制备方法。再进一步制备出(Ca_(0.96)D_(0.04))MnO_3(D=Sr, Rb, Sm)氧化物块体,最后对(Ca_(0.96)D_(0.04))MnO_3(D=Ca, Sr, Rb, Sm)块体的物相组成、显微组织和热电性能进行测试分析。实验结果表明:氩气气氛放电等离子烧结制备的CaMnO_3块体发生物相分解,原因是放电等离子烧结的烧结环境贫氧;空气气氛的常压烧结可以得到物相较纯净的(Ca_(0.96)D_(0.04))MnO_3(D=Ca, Sr,Rb, Sm)块体;在整个测试温度范围内,(Ca_(0.96)D_(0.04))MnO_3(D=Sr, Rb, Sm)的ZT值在873 K时达到最大,分别为0.11、0.08和0.07,相比于未掺杂试样提高了1.3～2.2倍。
The(Ca0.96D0.04)MnO3(D=Ca, Sr, Rb, Sm) oxide powders were prepared by a sol-gel method firstly, and the CaMnO3(CMO)bulk samples were prepared thereafter by spark plasma sintering in an argon atmosphere and air atmospheric sintering at ordinary pressure.After analyzing their phase composition, a better preparation method for CaMnO3 bulk samples were selected and then the(Ca0.96D0.04)MnO3(D=Sr, Rb, Sm) oxide bulks were prepared. Finally, the phase composition, microstructure and thermoelectric properties of(Ca0.96D0.04)MnO3(D=Ca, Sr, Rb, Sm) bulk samples were measured and analyzed. The results show that the CaMnO3(CMO) bulk samples prepared by spark plasma sintering in argon atmosphere have undergone phase decomposition, which is due to the poor oxygen sintering environment of SPS. High quality(Ca0.96D0.04)MnO3(D=Ca, Sr, Rb, Sm) bulk samples with single phase can be prepared by air atmospheric sintering at ordinary pressure. For(Ca0.96D0.04)MnO3(D= Sr, Rb, Sm) bulk samples, the dimensionless figure of merit ZT is improved with peak values of 0.11, 0.08 and 0.07 at 873 K, which are 1.3~2.2 times higher than that of the un-doped samples.
作者
张静文
张飞鹏
杨新宇
王盼
杨之
张久兴
Zhang Jingwen;Zhang Feipeng;Yang Xinyu;Wang Pan;Yang Zhi;Zhang Jiuxing(Anhui Provincial Key Laboratory of Advanced Functional Materials and Devices,Hefei University of Technology,Hefei 230009,China;Henan Provincial Engineering Laboratory of Building-Photovoltaics,Henan University of Urban Construction,Pingdingshan 467036,China;Key Laboratory of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第2期644-649,共6页
Rare Metal Materials and Engineering
基金
国家自然科学基金(51572066)
第一届河南省自然科学基金(162300410007)
