Synthesis, Structural, Magnetic, and Electrical Study of BaSrCo2O5, a Highly Disordered Cubic Perovskite

被引：7

作者：

Boulahya, K. ^{[1
]}

Ruiz-Morales, J. C. ^{[2
]}

Hernando, M. ^{[1
]}

Gonzalez-Calbet, J. M. ^{[1
]}

Parras, M. ^{[1
]}

机构：

[1] Univ Complutense Madrid, Fac Quim, Dept Quim Inorgan, E-28040 Madrid, Spain

[2] Univ La Laguna, Dept Quim Inorgan, Canary Isl 38200, Spain

来源：

CHEMISTRY OF MATERIALS | 2009年 / 21卷 / 10期

关键词：

MIXED-CONDUCTING OXIDES; TRANSPORT-PROPERTIES; ELECTRONIC-STRUCTURE; NEUTRON-DIFFRACTION; CRYSTAL-STRUCTURE; PHASE; BROWNMILLERITE; SRCOO2.5;

D O I：

10.1021/cm802606s

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of the partial substitution of Sr by Ba in the SrCoO3-y on its structure and properties has been investigated. SrBaCo2O5 is stable at room temperature as a cubic phase with a high oxygen vacancy concentration. This structure is stable up to 800 K. Above this temperature, the phase decomposes into a monodimensional rhombohedral (SrBa)(7)Co6O18 phase. At 1200 K, a reversible rhombohedral -> cubic transformation is observed, the rhombohedral phase remaining stable until room temperature. SrBaCo2O5 shows antiferromagnetic behavior with T-N approximate to 525 K. As determined by neutron diffraction data, the magnetic Co spins align ferromagnetically on the (111) planes and these planes are stacked antiferromagnetically in the normal direction (type II anti ferromagnet). The temperature dependence of the electrical conductivity indicates SrBaCo2O5 to be a semiconducting p-type material with an activation energy of similar to 0.3 eV.

引用

页码：2045 / 2054

页数：10

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