KTa1-xNbxO3晶体生长过程中气泡与界面的相互作用

doi:10.15541/jim20170068

摘要/Abstract

摘要：

本研究通过高温实时观察系统可视化研究了钽铌酸钾晶体的熔化和生长过程中气泡的产生及其与界面的相互作用。研究发现气泡在熔化过程中主要从固液界面处而不是熔体中产生。半径小于0.7 $\overline{r}$ (其中$\overline{r}$ 为气泡平均半径)的气泡大多来源于在固液界面处的成核, 而半径大于1.5 $\overline{r}$ 的气泡则为多个小气泡合并的结果。气泡的存在不仅会使临近界面生长速度降低, 还会影响晶体结构。单个气泡对生长界面的影响不仅取决于二者的长度比例, 还取决于界面的移动速度。实验证明了三种典型的包裹体结构(帽子状、球状以及椭球状)。本文对于气泡行为的研究有助于了解KTN晶体生长过程中包裹体的形成过程。

关键词: 钽铌酸钾, 晶体生长, 气泡, 实时观察, CT

Abstract:

The generation of bubbles and its interaction with the interface during melting and growth process of potassium tantalate niobate (KTa_1-_xNb_xO₃) crystals were visualized by a high temperature in-situ observation system. It was found that bubbles are generated mainly from the solid-liquid interface during melting, rather than from the melt. Bubbles with radii smaller than 0.7 $\overline{r}$ (where $\overline{r}$ is the mean radius of bubbles) arise mostly from nucleation at the interface while radii larger than 1.5 $\overline{r}$ are the result of coalescence. The existence of the bubble not only lowers the growth velocity of the near interface, but also affects the structure of the crystal. The effect of a bubble on the growing interface depends on their dimension ratio together with the moving speed of the interface. There are three typical kinds (hat-, sphere- and ellipsoid-shaped) of vapor inclusion morphologies being demonstrated. The analysis of the bubble behavior can promote the understanding of the formation of inclusion defects in KTN crystal growth process.

Key words: potassium tantalate niobate, crystal growth, bubble, in situ observation, computed tomography

中图分类号:

O781

李淑慧, 潘秀红, 刘岩, 金蔚青, 张明辉, 余建定, 陈锟, 艾飞. KTa_1-_xNb_xO₃晶体生长过程中气泡与界面的相互作用[J]. 无机材料学报, 2017, 32(11): 1223-1227.

LI Shu-Hui, PAN Xiu-Hong, LIU Yan, JIN Wei-Qing, ZHANG Ming-Hui, YU Jian-Ding, CHEN Kun, AI Fei. Interactions Between Bubble and Interface During KTa_1-_xNb_xO₃ Crystal Growth[J]. Journal of Inorganic Materials, 2017, 32(11): 1223-1227.

图/表 6

Fig. 1 The photo of the growth cell (a) Pt wire heater, (b) Pt-10% Rh thermocouple, (c) and (d) are electrodes

Fig. 2 Bubble behaviors during melting process (10 ×)The moment the crystal began to melt is defined as t = 0 s

Fig. 3 Interaction process between small single bubble and large S-L interface (20 ×) The moment the crystal began to crystalized is defined as t = 0 s

Fig. 4 Three views and stereo image of an inclusion L/D = 2.6, v0 = 87 μm/s

Fig. 5 Three views and stereo image of an inclusion L/D =1.3, v0 = 23 μm/s

Fig. 6 Three views and stereo image of an inclusion L/D = 0.6, v0 = 9 μm/s

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KTa_1-_xNb_xO₃晶体生长过程中气泡与界面的相互作用

Interactions Between Bubble and Interface During KTa_1-_xNb_xO₃ Crystal Growth

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