Effects of Ag Doping on the Electrical Properties of La2/3A1/3MnO3(A=Ca, Sr, Ba) Composites Materials

doi:10.3724/SP.J.1077.2013.13186

Abstract

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

CLC Number:

TB321

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

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