Crystal growth of bismuth tungstate Bi2WO6 by slow cooling method using borate fluxes
Crystal growth of bismuth tungstate Bi2WO6 by slow cooling method using borate fluxes
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DOI：
10.1016/j.jeurceramsoc.2005.03.184
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发表时间：
2005
影响因子：
5.7
通讯作者：
H. Takeda;T. Nishida;S. Okamura;T. Shiosaki
中科院分区：
文献类型：
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作者：
H. Takeda;T. Nishida;S. Okamura;T. Shiosaki
采用助熔剂法在低于铁电-顺电相变温度下生长了Bi2WO6（BWO）单晶。选择氯化钠、LiBO_2、Li_2B_4O_7（LBO）、Na_2B_4O_7（NBO）和Na_2B_4O_7·10H_2O作为助熔剂。我们发现LBO和NBO是适合晶体生长的助熔剂。采用差热分析和急冷法相结合的方法研究了BWO-LBO（NBO）体系的相图。在BWO-LBO（NBO）二元体系中，观察到端元混合物，没有中间化合物。在相图的基础上，我们从BWO：LBO = 7：3的凝固熔体中获得了厚度达0.7mm的板状晶体。晶体是单畴的，黄色的，并且具有发育良好的光滑的{001}面。室温下晶体的介电常数为90，具有铁电性能。
Ferroelectric Bi2WO6(BWO) single crystals have been grown by a flux method below the phase transition (ferro- to paraelectric) temperature. Sodium chloride, LiBO2, Li2B4O7(LBO), Na2B4O7(NBO) and Na2B4O7·10H2O were selected as the flux. We found that LBO and NBO are suitable flux materials for crystal growth. The phase diagram of the BWO–LBO(NBO) system was investigated by the combination of the differential thermal analysis and the quench method. In the BWO–LBO(NBO) binary system, the mixtures of the end members without intermediate compounds were observed. On the basis of the phase diagram, we have obtained plate-like crystals with sizes up to 0.7mm thickness from the solidified melts with the mole ratio BWO:LBO of 7:3. The crystals are single domain, yellow in color, and have well developed smooth {001} faces. The dielectric constant, ɛ33/ɛ0, of the crystals is 90 at room temperature and the ferroelectric behavior is available.