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Title

Magnetic properties and phase transitions of iron boracites, Fe3B7O13 X (X = Cl, Br or I)

Authors
Senthil Kumar, M.
Published in Ferroelectrics. 1997, vol. 204, no. 1, p. 73-81
Abstract Magnetic measurements for Fe-X (X = Cl, Br, and I) boracites at 3.6-300 K were performed. Temp. dependence of the magnetization and magnetic susceptibility for all compds. shows an antiferromagnetic order with Neel temps. of 11.5 K, 18.5 K, and 31 K, resp. The Curie-Weiss law holds for the temp. dependence of the magnetic susceptibility up to room temp. The effective magnetic moment obtained from the inverse susceptibility slope, for all compds., is higher than but close to the spin only value of the Fe2+ ion. From hysteresis measurements the temp. dependence of the coercive field was obtained, the 4 K value of the coercive field of Fe-Cl being approx. 5 times smaller than that of Fe-Br boracite and 25 times smaller than that of Fe-I boracite. For Fe-I the mm21' ↹ mL' ↹ 3 mL' phase transitions were evidenced by magnetic measurements, as a small thermal hysteresis in the temp. dependence of the reciprocal magnetization. [on SciFinder(R)]
Keywords Magnetic domain (ferromagneticSwitching in iron boracites Fe3B7O13X (X = ClBrOr I))Antiferromagnetic orderingCoercive forceMagnetic momentMagnetic susceptibilityMagnetizationNeel temperatureStructural phase transitionBoron iron halide oxide magnetic propertyPhase transition boron iron halide oxide
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Project FNS: 1995
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ANDREICA, Daniel Aurelian et al. Magnetic properties and phase transitions of iron boracites, Fe3B7O13 X (X = Cl, Br or I). In: Ferroelectrics, 1997, vol. 204, n° 1, p. 73-81. https://archive-ouverte.unige.ch/unige:31136

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