Frustrated and Unfrustrated Magnetic Orders in the 10H Perovskite Ba5Sb1-xMn4+xO15-delta

Congling Yin, Guobao Li, Winfried A. Kockelmann, Fuhui Liao, J. Paul Attfield, Jianhua Lin

Research output: Contribution to journalArticlepeer-review

Abstract

A 10-layer hexagonal perovskite Ba5Sb1-xMn4-1-xOj5-delta solid solution (0.24 <= x <= 0.36; space group P6(3)/mmc, a = 5.7095(1) angstrom, and c = 23.4866(3) angstrom for x = 0.36) has been synthesized by solid state reaction and studied using powder X-ray and neutron diffraction and magnetization measurements. This 10H polytype structure contains one corner-sharing (Sb,Mn)O-6 octahedron and a tetramer of four face-sharing MnO6 octahedra per formula unit. Two magnetic transitions are observed at 129-167 K (T-M) and 13-22 K (T-F). The frustration index vertical bar theta vertical bar/T-M, where theta is the Weiss temperature, is very close to unity, but considerable magnetic frustration is evidenced through the long-range order of a small similar to 0.5 mu B antiferromatznetic moment below T-M, and the formation of ferro- or ferrimagnetic clusters. These freeze at T-F with the vertical bar theta vertical bar/T-F approximate to -10 index representing high magnetic frustration. T(F)increases directly with the excess of Mn,x, in Ba5Sb1-xMn4+xO15-delta rather than with the overall Mn content, showing that the occupation of the corner-sharing Sb/Mn sites is key to the extended magnetism.

Original languageEnglish
Pages (from-to)3269-3276
Number of pages8
JournalChemistry of Materials
Volume22
Issue number10
DOIs
Publication statusPublished - 25 May 2010

Keywords

  • HEXAGONAL PEROVSKITE
  • STRUCTURAL CHEMISTRY
  • CRYSTAL-STRUCTURE
  • PHASE-SEPARATION
  • BAMNO3-X
  • OXIDES

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