Journal of Inorganic Materials ›› 2017, Vol. 32 ›› Issue (11): 1223-1227.DOI: 10.15541/jim20170068

• RESEARCH LETTER • Previous Articles     Next Articles

Interactions Between Bubble and Interface During KTa1-xNbxO3 Crystal Growth

LI Shu-Hui1,2, PAN Xiu-Hong1, LIU Yan1, JIN Wei-Qing1, ZHANG Ming-Hui1, YU Jian-Ding1, CHEN Kun1, AI Fei1   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China;
    2. University of Chinese Academy of Sciences, Beijing 100039, China
  • Received:2017-02-14 Online:2017-11-20 Published:2017-10-20
  • About author:LI Shu-Hui (1992-), female, candidate of master degree. E-mail: lishuhui@student.sic.ac.cn
  • Supported by:
    National Natural Science Foundation of China (51472263, 51602330);Shanghai Sailing Program (16YF1413100)

Abstract:

The generation of bubbles and its interaction with the interface during melting and growth process of potassium tantalate niobate (KTa1-xNbxO3) 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

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