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Ferroelectrics Volume 204, 1997 - Issue 1
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Magnetoelectric materials

Magnetic properties and phase transitions of iron boracites, Fe3B7O13X (X = Cl, Br or I)

D. Andreica Département de Chimie Minérale, Analytique et Appliquée, Faculté des Sciences, Unirersité de Genève, 30, quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
,
J.-P. Rivera Département de Chimie Minérale, Analytique et Appliquée, Faculté des Sciences, Unirersité de Genève, 30, quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
,
S. Gentil Département de Chimie Minérale, Analytique et Appliquée, Faculté des Sciences, Unirersité de Genève, 30, quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
,
Z.-G. Ye Niigata University, Faculty of Engineering, Ikarashi 2-nocho, 950-21, Niigata, Japan
,
M. Senthil Kumar Département de Chimie Minérale, Analytique et Appliquée, Faculté des Sciences, Unirersité de Genève, 30, quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
&
H. Schmid Département de Chimie Minérale, Analytique et Appliquée, Faculté des Sciences, Unirersité de Genève, 30, quai Ernest-Ansermet, CH-1211, Genève 4, Switzerland
Pages 73-81 | Received 15 May 1997, Published online: 26 Oct 2011
 
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Abstract

Magnetic measurements for Fe-X (X = C1, Br and I) boracites in the temperature range of 3.6—300K have been performed. Temperature dependence of the magnetization and magnetic susceptibility for all compounds shows an antiferromagnetic order with Néel temperatures of 11.5K, 18.5K and 31K, respectively. The Curie-Weiss law holds for the temperature dependence of the magnetic susceptibility up to room temperature. The effective magnetic moment obtained from the inverse susceptibility slope, for all compounds, is higher than but close to the spin only value of the Fe2+ ion. From hysteresis measurements the temperature dependence of the coercive field was obtained, the 4K value of the coercive field of Fe-Cl being approximately 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' ⇔ 3ml' phase transitions have been evidenced by magnetic measurements, as a small thermal hysteresis in the temperature dependence of the reciprocal magnetization.

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Related Research Data

Magnetic and structural phase transitions of multiferroic boracites M3B7O13X (M=3d transition metal Cr-Zn or Mg; X = halogen Cl, Br, I)
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