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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >THE GROWTH AND CHARACTERIZATION OF BI4TI3O12 SINGLE CRYSTALS USING A FLOATING-ZONE METHOD
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THE GROWTH AND CHARACTERIZATION OF BI4TI3O12 SINGLE CRYSTALS USING A FLOATING-ZONE METHOD

机译：浮动区法研究Bi4TI3O12单晶的生长和表征

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Single-crystal rods and fibres of Bi4Ti3O12 of various sizes oriented along [100] direction were successfully produced by a floating-zone method. Each of these crystals has a purely orthorhombic structure and a clear Curie transition at 668.8 degrees C (with a peak at 675.9 degrees C). Investigation of the growth characteristics revealed that the vaporization of Bi2O3 is dependent on the quality of the source rod, the growth rate and the length of the molten zone. For a source rod of pure Bi4Ti3O12, a growth rate of 30-35 mm h(-1) and a sufficiently short molten zone (for example 1.7-2.0 mm for growth of a 2.8-3.2 mm diameter crystal), a good (transparent, without cracks or inclusions) Bi4Ti3O12 single crystal can be produced directly from the stoichiometric source rod. Otherwise, a source rod with excess Bi2O3 is necessary to compensate for the vaporization of Bi2O3 during the growth process. The excess amount of Bi2O3 required is dependent on the sintered state of the source rod, the growth rate and the phase structures of the original powders from which the source rod had been pressed. In general, an increase in growth rate or in sintering temperature can decrease the required excess amount of Bi2O3 in the source rod. However, the excess amount of Bi2O3 required can be dramatically decreased by making the source rod from Bi12TiO20 and TiO2. [References: 23]
机译：通过浮区法成功制备了沿[100]方向取向的各种尺寸的Bi4Ti3O12单晶棒和纤维。这些晶体中的每一个均具有纯正交晶结构和在668.8摄氏度（峰值在675.9摄氏度）清晰的居里跃迁。对生长特性的研究表明，Bi2O3的汽化取决于源棒的质量，生长速率和熔融区的长度。对于纯Bi4Ti3O12的源棒，生长速率为30-35 mm h（-1），熔融区域足够短（例如，对于直径为2.8-3.2 mm的晶体，生长区域为1.7-2.0 mm），良好（透明） ，没有裂纹或夹杂物）Bi4Ti3O12单晶可以直接从化学计量的源棒生产。否则，必须使用具有过量Bi2O3的源棒来补偿Bi2O3在生长过程中的蒸发。所需的Bi 2 O 3的过量量取决于源棒的烧结状态，生长速度和已从中挤压源棒的原始粉末的相结构。通常，增加生长速度或烧结温度可以减少源棒中所需的Bi2O3过量。但是，通过由Bi12TiO20和TiO2制成源棒，可以大大减少所需的Bi2O3过量。 [参考：23]

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