Structural phase transitions in the ferromagnetic vanadium oxide NaV6O11

Yasushi Kanke, Fujio Izumi, Yukio Morii, Etsuo Akiba, Satoru Funahashi, Katsuo Kato, Mitsumasa Isobe, Eiji Takayama-Muromachi, Yoshishige Uchida

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29 Citations (Scopus)

Abstract

Neutron and X-ray diffraction experiments revealed that ferromagnetic NaV6O11 (Tc = 64.2 K) undergoes two-step second-order structural phase transitions upon cooling: hexagonal (P63/mmc) → hexagonal (P63mc) → orthorhombic (Cmc21). Its structure at 200 K was determined by single-crystal X-ray analysis: hexagonal, P63mc, a = 5.7049(2) Å, c = 13.0796(8) Å, and Z = 2. The P 63/mmc → P63mc transition is believed to accompany a magnetic transition at 245 K. V(1) octahedra, which construct an edge-sharing kagomé-type network, form a trimer on the P63/mmc → P 63mc transition. V(2) octahedra, which form face-sharing dimers, separate into two nonequivalent types on the hexagonal-hexagonal transition. The P63mc → Cmc 21 transition occurs at a temperature between 35 and 40 K, which is lower than Tc. V(1) octahedra split into two nonequivalent types on the P63mc → Cmc 21 transition. The transitions are compared with those in V2O3, V2O4, and LixVO2. The crystal structure of NaV6O11 lacks the center of symmetry below Tc, which allows a canted-spin arrangement for the ferromagnetic state if the Dzyaloshinski-Moriya interaction exists. No structural phase transition was observed for SrV6O11 (Tc = 70 K) between 22 and 373 K.

Original languageEnglish
Pages (from-to)429-437
Number of pages9
JournalJournal of Solid State Chemistry
Volume112
Issue number2
DOIs
Publication statusPublished - Oct 1994

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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