Effect of Mn doping on the physical properties of misfit-layered Ca3Co4O9+δ

被引：31

作者：

Chen, J. L. ^{[1
]}

Liu, Y. S. ^{[1
]}

Liu, Chia-Jyi ^{[2
]}

Huang, L-C ^{[2
]}

Dong, C. L. ^{[1
]}

Chen, S. S. ^{[1
]}

Chang, C. L. ^{[1
]}

机构：

[1] Tamkang Univ, Dept Phys, Tamsui, Taiwan

[2] Natl Changhua Univ Educ, Dept Phys, Changhua, Taiwan

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2009年 / 42卷 / 13期

关键词：

X-RAY-ABSORPTION; THERMOELECTRIC PROPERTIES; CRYSTAL; SYSTEM;

D O I：

10.1088/0022-3727/42/13/135418

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have carried out an x-ray absorption near-edge structure (XANES) study on a series of misfit-layered cobaltites Ca3Co4-xMnxO9+delta (x = 0, 0.05, 0.1, 0.15). In this system, the average valences of Co and Mn, according to Co and Mn K-edge measurements are about 3.50+ and 3+, respectively. Both the trivalent and tetravalent Co are of low-spin configurations as confirmed by our magnetization measurements. The variations of absorption intensities of Co L-2,L-3-edge and O K-edge XANES with respect to the Mn doping concentration (x) are analysed. Co L-2,L-3-edge results show that the Co 3d unoccupied states decrease with x, which correlate well with the trend of variation of thermoelectric power. O K-edge results indicate that the number of O 2p unoccupied states decreases with x, which implies a decrease in the majority charge carriers (hole) concentration upon partial substitution of Mn for Co.

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页数：5

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