Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca2Co1.6Ga0.4O5期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Synthesis, crystal and magnetic structure of a novel brownmillerite-type compound Ca₂Co_1.6Ga_0.4O₅

Authors:	SYa Istomin SV Abdyusheva EV Antipov

Institution:	^a Department of Chemistry, Moscow State University, 119899 Moscow, Russia ^b Department of Materials Chemistry, Moscow State University, 119899 Moscow, Russia ^c Department of Structural Chemistry, Stockholm University, SE-10691 Stockholm, Sweden

Abstract:	The novel compound Ca₂Co_1.6Ga_0.4O₅ with brownmillerite (BM) structure has been prepared from citrates at 950 °C. The crystal structure of Ca₂Co_1.6Ga_0.4O₅ was refined, from neutron powder diffraction (NPD) data, in space group Pnma, , , , χ²=1.798, , R_wp=0.0378 and R_p=0.0292. On the basis of the NPD refinement the compound was found to be a G-type antiferromagnet (space group Pn^′m^′a) at room temperature, with the magnetic moments of cobalt atoms directed along chains of tetrahedra in the BM structure. Electron diffraction and electron microscopy studies revealed disorder in the crystallites, which can be interpreted as the presence of slabs with BM-type structure of Pnma and I2mb symmetry.

Keywords:	Ca₂Co₁ 6Ga₀ 4O₅ Brownmillerites Neutron diffraction Electron diffraction Structure Antiferromagnetism
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