Structure and Magnetic Properties of New Trigonal Iron-Boracite, Fe^sub 3^B^sub 7^O^sub 13^(OH)

The magnetic properties of a newly synthesized compound, ... (OH), are reported. The space group and lattice constants at room temperature are R 3 c H ( trigonal , #161), a = 8.590(3) A and c = 21.107(7) A. In this compound, three Fe 2+ ions form an equilateral triangular trimer sharing a hydroxide...

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Veröffentlicht in:Journal of the Physical Society of Japan 2011-01, Vol.80 (1), p.1
Hauptverfasser: Nomoto, Ippei, Sato, Hirohiko, Fukui, Tomoya, Narumi, Yasuo, Kindo, Koichi, Nakamura, Shin, Tsunoda, Yorihiko
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container_start_page 1
container_title Journal of the Physical Society of Japan
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creator Nomoto, Ippei
Sato, Hirohiko
Fukui, Tomoya
Narumi, Yasuo
Kindo, Koichi
Nakamura, Shin
Tsunoda, Yorihiko
description The magnetic properties of a newly synthesized compound, ... (OH), are reported. The space group and lattice constants at room temperature are R 3 c H ( trigonal , #161), a = 8.590(3) A and c = 21.107(7) A. In this compound, three Fe 2+ ions form an equilateral triangular trimer sharing a hydroxide ion, and the trimers further construct a trigonal lattice. The magnetic susceptibility exhibits an antiferromagnetic phase transition accompanied by a steep drop in susceptibility at T ...4.8 K under small magnetic fields. Mossbauer spectroscopy indicates that Fe ions are divalent. It also suggests a simple spin structure in which all of the spins are equally canted from the principal axis of the electric-field gradient below T ... This magnetic ground state is, however, easily destroyed by almost 1 T of magnetic field regardless of its direction. In addition to this transition, successive metamagnetic transitions are induced by larger magnetic fields. The additional transitions are strongly dependent on the direction of the applied magnetic field, resulting in a rich magnetic phase diagram. (ProQuest: ... denotes formulae/symbols omitted.)
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subjects Electric fields
Ions
Magnetic fields
Phase transitions
Spectrum analysis
title Structure and Magnetic Properties of New Trigonal Iron-Boracite, Fe^sub 3^B^sub 7^O^sub 13^(OH)
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