Crystal and magnetic structures of the brownmillerite Ca2Cr2O5

Angel M. Arevalo-Lopez, J. Paul Attfield*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Powder neutron diffraction and magnetic susceptibility measurements at 10-300 K have been used to determine the crystal and magnetic structures of brownmillerite type Ca2Cr2O5, which was obtained by reduction of the high pressure phase CaCrO3 through hard-soft chemistry. The ambient temperature crystal structure of Ca2Cr2O5 is refined in space group I2mb and the unusual tetrahedral coordination of Cr3+ results in local structural distortions. Cr3+ spins order antiferromagnetically below 220 K and a substantial observed canting of moments shows that Heisenberg exchange is weak or frustrated and competes with antisymmetric Dzialoshinskii-Moriya interactions.

Original languageEnglish
Pages (from-to)10661-10664
Number of pages4
JournalDalton Transactions
Volume44
Issue number23
DOIs
Publication statusPublished - 2015

Keywords

  • HARD-SOFT SYNTHESIS
  • DIFFRACTION
  • PEROVSKITES
  • VACANCY
  • SERIES

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