Grain growth kinetics of textured-BaTiO3 ceramics

Bulletin of materials science

Zhengkui Xu¹  Xi Yao³  Fang Fu²  Jiwei Zhai³  Bo Shen³ 

[1] Department of Physics and Materials Science, City University of Hong Kong, Hong Kong$$Department of Physics and Materials Science, City University of Hong Kong, Hong KongDepartment of Physics and Materials Science, City University of Hong Kong, Hong Kong$$;Luoyang Institute of Science and Technology, Luoyang 471023, China$$Luoyang Institute of Science and Technology, Luoyang 471023, ChinaLuoyang Institute of Science and Technology, Luoyang 471023, China$$;Functional Materials Research Laboratory, Tongji University, Shanghai 200092, China$$Functional Materials Research Laboratory, Tongji University, Shanghai 200092, ChinaFunctional Materials Research Laboratory, Tongji University, Shanghai 200092, China$$

关键词: Textured-BT ceramics;    tape casting;    grain growth;    phenomenological kinetic.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Textured BaTiO₃ (BT) ceramics were fabricated by templated grain growth method. Effects of sintering conditions on the grain growth process of textured-BT ceramics were investigated. Orientation degree increased initially and then decreased with increasing soaking time. The ceramics were composed of equiaxed matrix grains and brick-like template particles. The brick-like particles aligned parallel to the casting direction by observing from SEM images. A (â„�?00)-preferred orientation was confirmed by SAED and XRD patterns. Mechanism of grain growth in textured-BT ceramics was studied. Both consumption of matrix by templates and grain growth of templates determined the orientation degree of ceramics. The kinetic mechanism for grain orientation was also discussed by the simplified phenomenological kinetic equation. The average activation energies were 364 kJ/mol for matrix grain and 918 kJ/mol for template particle, respectively. Finally, a dense ceramic with 85% grain orientation was obtained after sintering at 1400°C for 2 h.

【 授权许可】

Unknown