Magnetic properties of the spin tetramer compound Ba6la 2Fe4O15

Kyosuke Abe, Yoshihiro Doi, Yukio Hinatsu, Kenji Ohoyama

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3 Citations (Scopus)

Abstract

The crystal structure and magnetic properties for quaternary oxide Ba 6La2Fe4O15 have been investigated. This compound has a hexagonal structure in which four Fe ions per formula unit occupy the sites in one FeO6 octahedron and three FeO4 tetrahedra. These polyhedra form a larger unit Fe4O15 cluster by corner sharing. This cluster shows behavior characteristic of a magnetic tetramer with a ferrimagnetic ground state of the total spin S T = 5 by the antiferromagnetic interaction between Fe3+ ions. From the magnetic susceptibility and specific heat measurements, we observed an antiferromagnetic transition at 12.8 K. The magnetic structure was determined by power neutron diffraction at 2.3 K, which indicates that the transition is due to the long-range antiferromagnetic ordering of the Fe 4O15 clusters. The ordered magnetic moment for each Fe3+ ion is determined to be ∼4μB. In addition, it is found that the antiferromagnetic structure changes to a ferromagnetic structure of clusters in an applied field of ∼2 T (at 1.8 K).

Original languageEnglish
Pages (from-to)785-789
Number of pages5
JournalChemistry of Materials
Volume18
Issue number3
DOIs
Publication statusPublished - 2006 Feb 7

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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