Comparison of magnetic and thermoelectric properties of (Nd,Ca)BaCo2O5.5 and (Nd,Ca)CoO3

被引：13

作者：

Kolesnik, S. ^{[1
]}

Dabrowski, B. ^{[1
,2
]}

Chmaissem, O. ^{[1
,2
]}

Wojciechowski, K. ^{[3
]}

Swierczek, K. ^{[4
]}

机构：

[1] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[3] AGH Univ Sci & Technol, Fac Mat Sci & Ceram, Dept Inorgan Chem, PL-30059 Krakow, Poland

[4] AGH Univ Sci & Technol, Fac Energy & Fuels, Dept Hydrogen Energy, PL-30059 Krakow, Poland

来源：

JOURNAL OF APPLIED PHYSICS | 2012年 / 111卷 / 07期

关键词：

112; LNBACO(2)O(5.50+/-DELTA);

D O I：

10.1063/1.3679561

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Magnetic and thermoelectric properties of Nd1-xCaxBaCo2O5.5 and Nd1-xCaxCoO3 have been studied. Ca doping in Nd1-xCaxBaCo2O5.5 (x <= 0.2) preserves the metal to insulator transition (MIT) at 340-360 K. While the antiferromagnetic state disappears upon doping, the Curie temperature is increasing and becomes close to MIT for x > 0.12. The magnetic susceptibility of Nd1-xCaxCoO3 is paramagnetic for x up to 0.2, similar to the parent compound, with some indication of cluster-glass-like behavior at temperatures below 30K. The increasing effective paramagnetic moments with doping suggest a low spin state of Co3+ and a high spin state of Co4+. Maximum observed ZT reaches a value close to 0.2 for x = 0.15 at 800K, which is one of the highest values for perovskite cobaltites. (C) 2012 American Institute of Physics. [doi:10.1063/1.3679561]

引用

页数：3

共 14 条

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