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Effect of milling on the anisotropic grain growth in a sintered Ba 5 Nb 4 O 15 specimen and its effect on microwave dielectric properties
Author(s) -
Tsao ChungYa,
Tuan WeiHsing,
Feng KueiChih
Publication year - 2019
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13233
Subject(s) - materials science , microstructure , grain growth , grain size , dielectric , slurry , anisotropy , microwave , electroceramics , ceramic , barium , composite material , mineralogy , chemical engineering , metallurgy , optics , optoelectronics , fabrication , physics , chemistry , quantum mechanics , engineering , medicine , microfabrication , alternative medicine , pathology
In this study, relationships between the processing, microstructure, and properties of barium niobate (Ba 5 Nb 4 O 15 ) are investigated. The milling of a Ba 5 Nb 4 O 15 powder in water is effective with respect to size reduction. However, after milling in water, BaCO 3 is formed within the slurry. With the increase in the amount of BaCO 3 formed, the aspect ratio of the elongated Ba 5 Nb 4 O 15 grains increases. The formation of the elongated Ba 5 Nb 4 O 15 grains prohibits the densification. Hence, the microwave dielectric properties, including permittivity and quality factor, are poor because of the low density. In addition, milling in ethanol is carried out for comparison: A lower amount of BaCO 3 is formed after milling in ethanol; the extent of anisotropic grain growth is thus reduced.