Crystal structure and magnetism of Fe2(OH)[B2O4(OH)]

Yotaro Kurayoshi, Shigeo Hara, Hirohiko Sato, Cathrine Frandsen, Steen Mørup, Helge Kildahl Rasmussen, Shin Nakamura

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The structure and magnetism of Fe2(OH)[B2O4(OH)] are reported. Powder x-ray diffraction reveals a characteristic structure containing two crystallographically independent zigzag-ladder chains of magnetic Fe2+ ions. Magnetization measurements reveal a phase transition at 85 K, below which a weak spontaneous magnetization (approximate to 0.15 μB/Fe) appears. Below 85 K, magnetization increases with decreasing temperature down to 70 K, below which it decreases and approaches a constant value at low temperature. The Mossbauer spectrum at room temperature is composed of two paramagnetic doublets corresponding to the two crystallographic Fe2+ sites. Below 85 K, each doublet undergoes further splitting because of the magnetic hyperfine fields. The temperature dependence of the hyperfine field is qualitatively different for the two distinguishable Fe2+ sites. This is responsible for the anomalous temperature dependence of the magnetization.
Original languageEnglish
JournalJOURNAL OF PHYSICS-CONDENSED MATTER
Volume26
Issue number26
ISSN0953-8984
DOIs
Publication statusPublished - 2014

Keywords

  • Crystal structure
  • magnetization
  • Mössbauer spectroscopy
  • Iron oxide

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