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Spontaneous magnetization and magnetic susceptibility of a ferroelectric/ferromagnetic/ferroelastic single domain crystal of nickel bromine boracite Ni3B7O13Br

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Published in Journal of Magnetism and Magnetic Materials. 1999, vol. 195, no. 1, p. 65-75
Abstract Using a SQUID magnetometer, the magnetic field-induced magnetization was measured on a ferroelastically 'poled' orthorhombic ferroelec./ferroelastic single domain of Ni3B7O13Br. Measurements were performed along the three principal orthorhombic crystallog. axis directions at 0.5, 1.0, 3.0, and 5.0 kOe in the range 4-40 K, and at 10 kOe in the range 4-300 K. The corresponding magnetic susceptibilities were derived. The sequence of magnetic phases at low temp., their magnetic point groups and transition temps. Tcl = 30 K and Tc2 = 21 K were confirmed: mm21' <= Tc1 => m'm2' <= Tc2 +> 1. In the weakly ferromagnetic/ferroelec./ferroelastic orthorhombic phase with Shubnikov-Heesch point group m'm2' in the range 21 K < T < 30 K, the spontaneous magnetization vector Ms lies along the orthorhombic bo-axis, with a value of Ms = 0.71 emu/g at 25 K. In the triclinic phase with point Group 1, below Tc2 = 21 K, Ms assumes a temp.-dependent crystallog. general direction lying nearly in the pseudo-orthorhombic (001)0-plane, for example at 5 K with a value of Ms = (2.7a0 + 1.76b0 + 0.34c0) emu/g. [on SciFinder(R)]
Keywords FerroelasticityFerroelectric domainMagnetic domainMagnetic transitionPhase transition temperature (of ferroelec./ferromagnetic/ferroelastic single domain crystal of nickel bromine boracite) Ferroelastic materialsFerroelectric materialsFerromagnetic materials Magnetic susceptibilityMagnetization (spontaneous magnetization and magnetic susceptibility of ferroelec./ferromagnetic/ferroelastic single domain crystal of nickel bromine boracite)Magnetism nickelBromine boracite
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Project FNS: 1995
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MAO, Shao Yu et al. Spontaneous magnetization and magnetic susceptibility of a ferroelectric/ferromagnetic/ferroelastic single domain crystal of nickel bromine boracite Ni3B7O13Br. In: Journal of Magnetism and Magnetic Materials, 1999, vol. 195, n° 1, p. 65-75. https://archive-ouverte.unige.ch/unige:31111

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Deposited on : 2013-11-18

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