Frustrated and Unfrustrated Magnetic Orders in the 10H Perovskite Ba5Sb1−xMn4+xO15−δ
作者： Congling Yin , Guobao Li , Winfried A. Kockelmann , Fuhui Liao , J. Paul Attfield
DOI: 10.1021/CM100578U
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摘要: A 10-layer hexagonal perovskite Ba5Sb1−xMn4+xO15−δ solid solution (0.24 ≤ x 0.36; space group P63/mmc, a = 5.7095(1) A, and c 23.4866(3) for 0.36) has been synthesized by state reaction studied using powder X-ray neutron diffraction magnetization measurements. This 10H polytype structure contains one corner-sharing (Sb,Mn)O6 octahedron tetramer of four face-sharing MnO6 octahedra per formula unit. Two magnetic transitions are observed at 129−167 K (TM) 13−22 (TF). The frustration index |θ|/TM, where θ is the Weiss temperature, very close to unity, but considerable evidenced through long-range order small ∼0.5 μB antiferromagnetic moment below TM, formation ferro- or ferrimagnetic clusters. These freeze TF with |θ|/TF ≈ 7−10 representing high frustration. increases directly excess Mn, x, in rather than overall Mn content, showing that occupation ...
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