In situ observation of NaBi(WO_4)_2 dendrite growth and the study on microstructure of solidification

作     者：AI Fei, HONG Yong, JIN WeiQing, LUO HaoSu, LIU Yan & PAN XiuHong Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China 

作者机构：Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2007年第50卷第4期

页      面：525-530页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0702[理学-物理学] 

基　　金：the National Natural Science Foundation of China (Grant No. 50331040) the Innovation Funds from Shanghai Institute of Ceramics,Chinese Academy of Sciences (Grant No. SCX0623) 

主　　题：oxide dendrite in-situ observation solidification structure 

摘      要：The dendrite growth process of transparent NaBi(WO4)2 with small prandtl and high melting point was studied by using the in-situ observation system. According to the dynamic images and detailed information, there are two kinds of restriction effect on the dendrite growth, the competition between arms and branches and the convection in the melt. The dendrite growth rate was time dependent, and the rate of arm growth reached the maximum 5.8 mm/s in the diffusive-advective region and rapidly decreased in the diffusive-convective region. The growth rate of branch had the same change trends as the arm’s. Based on the EPMA-EDS data of solidifica- tion structure of quenched NaBi(WO4)2 melt, it was found that there were compo- nent differences from stoichiometric concentration in the melt near the interface during the growth process.