Transmission electron and optical microscopy of the domain structure of Ni₃B₇O₁₃Br ferroic boracite

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• 作者：Castellanos-Guzman ; A.G. ; Trujillo-Torrez ; M. ; Czank ; M.
• 关键词：Boracite crystals ; Domains ; Polarised-light microscopy ; Transmission electron microscopy ; Ferroelectricity ; Ferroelasticity
• 刊名：Materials Science & Engineering B
• 出版年：2005
• 出版时间：July 15, 2005
• 年：2005
• 卷：120
• 期：1-3
• 页码：59-63
• 全文大小：231 K

文摘

The study investigated the domain structure of nickel bromine boracite single crystals, by means of polarised-light in conjunction with transmission electron microscopy. Single crystals of Ni₃B₇O₁₃Br were grown by chemical transport reactions in closed quartz ampoules, in the temperature range of 1130 K and were examined by polarising optical microscopy (PLM), and transmission electron microscopy (TEM). PLM was also used in order to study the behaviour of birefringence as a function of temperature. For TEM the single crystals were crushed and mounted on holey carbon films. Comparative electron microscope images were useful for revealing the domain structure of this fully ferroelectric/fully ferroelastic material previously observed between the crossed polars of an optical microscope. X-ray diffraction analysis of the crystal under study was performed at room temperature.