Interactions Between Bubble and Interface During KTa1-xNbxO3 Crystal Growth

doi:10.15541/jim20170068

Abstract

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

CLC Number:

O781

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.

Figures/Tables 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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Interactions Between Bubble and Interface During KTa_1-_xNb_xO₃ Crystal Growth

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