Spontaneous birefringence and polarization studies on boracite Cr3B7O13Cl

Ye, Zuo-Guang; Rivera, Jean-Pierre; Burkhardt, Ernst; Schmid, Hans

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Title		Spontaneous birefringence and polarization studies on boracite Cr₃B₇O₁₃Cl
Authors		Ye, Zuo-Guang Rivera, Jean-Pierre Burkhardt, Ernst Schmid, Hans
Published in		Phase Transitions. 1991, vol. 36, no. 1, p. 13-26
Abstract		Cr-Cl boracite single crystals (Cr3B7O13Cl) were studied at 10-300 K by optical and elec. characterizations under simultaneous visual control of the ferroelec. domain states. The temp. dependence of both the spontaneous birefringence Dns and the spontaneous polarization PS indicates clearly the 1st-order feature of both the .hivin.43m/.hivin.42m phase transition at T1 = 264 K and the .hivin.42m/mm2 one at T2 ~ 160 K. The optical indicatrix of the orthorhombic phase is biaxial pos. with the optical axes lying in the a-b plane and the index nb//PS//{001}cub. The important role played by the simultaneous optical domain control and the influence of the nature of electrodes on the measurements are also pointed out.
Keywords		Cr-Cl boracite — Spontaneous birefringence — Spontaneous polarization — Phase transitions — Magnetic ordering
Full text		Article (Published version) (2.1 MB) - Limited access to UNIGE
Structures		Faculté des sciences / Section de chimie et biochimie / Département de chimie minérale, analytique et appliquée
Project		FNS: 1990
Citation (ISO format)		YE, Zuo-Guang et al. Spontaneous birefringence and polarization studies on boracite Cr₃B₇O₁₃Cl. In: Phase Transitions, 1991, vol. 36, n° 1, p. 13-26. https://archive-ouverte.unige.ch/unige:32036