Ag掺杂对La2/3A1/3MnO3(A=Ca、Sr、Ba)材料电学性能的影响

doi:10.3724/SP.J.1077.2013.13186

无机材料学报 ›› 2013, Vol. 28 ›› Issue (12): 1307-1312.DOI: 10.3724/SP.J.1077.2013.13186

Ag掺杂对La_2/3A_1/3MnO₃(A=Ca、Sr、Ba)材料电学性能的影响

刘翔, 晏益志, 陈清明, 张辉, 曹明刚, 张少春

(昆明理工大学材料科学与工程学院, 昆明 650093)

收稿日期:2013-04-02 修回日期:2013-06-27 出版日期:2013-12-20 网络出版日期:2013-11-15
基金资助:
国家自然科学基金(50974066); 云南省自然科学基金(2009ZC013M)

Effects of Ag Doping on the Electrical Properties of La_2/3A_1/3MnO₃(A=Ca, Sr, Ba) Composites Materials

LIU Xiang, YAN Yi-Zhi, CHEN Qing-Ming, ZHANG Hui, CAO Ming-Gang, ZHANG Shao-Chun

LIU Xiang, YAN Yi-Zhi, CHEN Qing-Ming, ZHANG Hui, CAO Ming-Gang, ZHANG Shao-Chun

Received:2013-04-02 Revised:2013-06-27 Published:2013-12-20 Online:2013-11-15
Supported by:
National Natural Science Foundation of China (50974066); Natural Science Foundation of Yunnan Province (2009ZC013M)

摘要/Abstract

摘要： 采用化学共沉淀法制备了La_2/3A_1/3MnO₃:Ag_x (A=Ca、Sr、Ba, LAMO:Ag_x, x=0、0.1、0.2、0.3、0.4 mol%)多晶复合材料。XRD结果表明实验制备了纯相LAMO:Agx样品, Ag⁺离子A位替代致使LCaMO:Ag_x和LSrMO:Ag_x晶格常数和晶胞体积发生微小膨胀, LBaMO:Ag_x晶格常数和晶胞体积发生微小收缩; R-T测试结果表明LCaMO:Ag_x的电阻温度系数(Temperature Coefficient of Resistance, TCR)数值在x=0.4、T_k=271.3 K(T_k为TCR位于最大值时对应的温度数值)时具有最大值为28%/K。SEM分析结果表明, 随着Ag掺杂量增加, LCaMO晶粒尺寸增大, 晶粒均匀性和规则性得以改善, 晶化质量得到提高。通过Ag微观掺杂机制对LAMO复合材料的TCR数值增强进行了分析讨论。

关键词: La_2/3A_1/3MnO₃; , Ag掺杂, 电阻温度系数, 金属绝缘转变温度

Abstract: La_2/3A_1/3MnO₃:Ag_x(A=Ca, Sr, Ba, LAMO:Ag_x, x=0, 0.1, 0.2, 0.3, 0.4, mol%) composites materials were prepared successfully by co-precipitation route. XRD results showed that the pure phase LAMO:Agx samples were obtained. By substitution of A site with Ag ion, the crystal lattice and cell volume were expanded slightly for LCaMO: Ag_x and LSrMO:Ag_x, but shrinked slightly for LBaMO:Ag_x R-T measurement results showed that the maximum temperature coefficient of resistance (TCR) of LCaMO:Ag_x composites reached 28%/K as x=0.4, T_k=271.3 K (T_k: temperature at the maximum TCR value). SEM images showed that for LCaMO composites, the particle size were enlarged. The uniform, homogeneity and crystal quality were improved with increase of Ag doping. The TCR enhancement of LAMO:Ag_x composites are discussed by the microscopic mechanism with Ag doping.

Key words: La_2/3A_1/3MnO₃, silver doping, temperature coefficient of resistance, metal insulator transition temperature

中图分类号:

TB321

刘翔, 晏益志, 陈清明, 张辉, 曹明刚, 张少春. Ag掺杂对La_2/3A_1/3MnO₃(A=Ca、Sr、Ba)材料电学性能的影响[J]. 无机材料学报, 2013, 28(12): 1307-1312.

LIU Xiang, YAN Yi-Zhi, CHEN Qing-Ming, ZHANG Hui, CAO Ming-Gang, ZHANG Shao-Chun. Effects of Ag Doping on the Electrical Properties of La_2/3A_1/3MnO₃(A=Ca, Sr, Ba) Composites Materials[J]. Journal of Inorganic Materials, 2013, 28(12): 1307-1312.

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Ag掺杂对La_2/3A_1/3MnO₃(A=Ca、Sr、Ba)材料电学性能的影响

Effects of Ag Doping on the Electrical Properties of La_2/3A_1/3MnO₃(A=Ca, Sr, Ba) Composites Materials

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