Structural and magnetic properties of a new type of ordered oxygen-deficient perovskite, KMnVO 4

H. Ben Yahia, E. Gaudin, C. Lee, M. H. Whangbo, J. Darriet

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A new ternary vanadate KMnVO 4 was prepared by a solid-state reaction and was shown to be a new type of ordered oxygen-deficient perovskite ABO 3 - δ with δ = 1/3. Its formula can be rewritten as (K 2,Mn)[Mn,V 2]O 81. An ordered distribution of potassium and manganese atoms in the A site and of vanadium and manganese atoms in the B site is observed. The manganese atoms are in distorted octahedral and tetrahedral sites, whereas all of the vanadium atoms form VO 4 3- tetrahedra. This oxide contains four different types of high-spin Mn 2+ ions in equal number. Magnetic susceptibility and specific heat measurements as well as spin dimer analysis show that substantial antiferromagnetic spin-exchange interactions occur primarily among three of the four different types of Mn 2+ ions, and the fourth Mn 2+ ion remains paramagnetic down to 2 K.

Original languageEnglish
Pages (from-to)5563-5569
Number of pages7
JournalChemistry of Materials
Issue number23
Publication statusPublished - 13 Nov 2007


ASJC Scopus subject areas

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

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