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Huge differences in ferroelectric Curie temperature between growth sectors of boracite crystals

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Published in Japanese Journal of Applied Physics. 1985, vol. 24, p. 574-576
Abstract The cubic (̅43 m)/orthorhombic (mm2) phase transition temp. Tc of Mn-I, Zn-I, Ni-Br, and Cu-Br boracite was measured by polarized light microscopy in the pyramidal growth sectors. In either of the 5 compns. the (100), (110), (111), and (̅1̅1̅1) growth pyramids differ in a systematic way in Tc for each compn. A max. difference of ∼15 K between inequivalent sectors was obsd. in the same sample of both Zn-I and Cu-Br boracite. In a (100) growth sector of Ni-I boracite the cubic (̅43 mL')/monoclinic (m') transition is characterized by a sharp peak of dielec. const. ε', whereas in a strongly absorbing and birefringent (111) sector the anomaly is annihilated.
Keywords Ferroelectricity (Curie Point, of boracite crystals, growth sector effect on)
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Note P roceedings of the Sixth International Meeting on Ferroelecrricity, Kobe 1985
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Project FNS: 1984
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ROSSIGNOL, Jean-François, RIVERA, Jean-Pierre, SCHMID, Hans. Huge differences in ferroelectric Curie temperature between growth sectors of boracite crystals. In: Japanese Journal of Applied Physics, 1985, vol. 24, p. 574-576. https://archive-ouverte.unige.ch/unige:32168

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