Effects of milling condition on the formation of core-shell structure in BaTiO3 grains

• Published in: Journal of the European Ceramic Society Vol. 28; no. 13; pp. 2589 - 2596
• Main Authors: KIM, Chang-Hoon, PARK, Kum-Jin, YOON, Yeo-Joo, SINN, Dong-Sook, KIM, Young-Tae, HUR, Kang-Heon
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier 01.09.2008
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Chemical industry and chemicals; Electrotechnical and electronic ceramics; Exact sciences and technology; Technical ceramics; Scanning electron microscopy; Core shell structure; BaTiO3; Grinding(comminution); Titanates; Experimental study; X ray diffraction; Core-shell; Oxide ceramics; Submicron particle; Mechanical treatment; Milling; Barium Titanates; Manufacturing; Raman spectrum; Electroceramics
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2008.03.030

The effects of ball-milling conditions on the formation of a core-shell structure in BaTiO3 grains were studied. As the ball-milling time increased from 12 h to 48 h, the stress given by the milling process was accumulated in the powders. The primary powder size was reduced at 24 h milling and additional comminution of powders occurred at 48 h milling. The change of powder characteristics did not induce any difference in the sinterability but influenced the formation of the core-shell structure. The increase in milling time facilitated the shell formation leading to an increased shell portion in the core-shell grain. At 48 h milling, the comminution effect as well as the increased milling stress resulted in the extensive formation of shell which was reflected by a remarkable rise of the low temperature part of the relative dielectric constant vs temperature curve. 20 refs.