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Title

Magnetic ordering of Mn3B7O13X (X = Cl, Br, I) boracites determined by magnetic measurements and neutron diffraction

Authors
Schobinger-Papamantellos, Penelope
Suard, E.
Ritter, C.
Published in Ferroelectrics. 1997, vol. 204, no. 1, p. 45-55
Abstract A new method for the prepn. of Mn311B7O13I powder sample, used for neutron diffraction, is presented. Magnetization measurements on powder samples of Mn3B7O13X (X = Cl, Br, I) have shown that their Neel temps. are 11 ± 0.5 K for Mn3B7O13Cl, 14 ± 0.5 K for Mn3B7O13Br and 26 ± 0.5 K for Mn3B7O13I. The crystal and the magnetic structures of Mn3B7O13I were investigated by neutron diffraction. The neutron diffraction pattern in the paramagnetic phase at 35 K was refined in space group Pca211'. The neutron diffraction data confirm the onset of magnetic ordering at 26 K. The magnetic structure was detd. at 1.5 K in the magnetic space group Pc'a21'. The magnetic moments of the 3 Mn sites order with a 2D canted spin arrangement. The moments of 2 sites point along c with μz(Mn2) = μz(Mn3) = 3.8(2) μB/atom while the Mn(1) site has a magnetic moment of 5.4(2) μB/atom located in the (101) orthorhombic plane, forming an angle of 12.0(3) degrees with the a direction. The effect of the antiferromagnetic/ferromagnetic compromise on the Mn-I-Mn pathways is discussed.
Keywords Manganese iodine boraciteNeutron diffractionNBel temperatureMagnetic phase transitionMagnetic structure
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Project FNS: 1995
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CROTTAZ, Olivier et al. Magnetic ordering of Mn3B7O13X (X = Cl, Br, I) boracites determined by magnetic measurements and neutron diffraction. In: Ferroelectrics, 1997, vol. 204, n° 1, p. 45-55. https://archive-ouverte.unige.ch/unige:31137

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Deposited on : 2013-11-19

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