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Effect of Powder Characteristics on Microstructures and Dielectric Properties of (Ba,Nb)‐Doped Titania Ceramics
Author(s) -
Wu JennMing,
Chen ChiJen
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06528.x
Subject(s) - materials science , crystallite , abnormal grain growth , microstructure , coprecipitation , ceramic , grain growth , agglomerate , sintering , doping , homogeneity (statistics) , grain size , particle size , dielectric , particle size distribution , mineralogy , chemical engineering , metallurgy , composite material , chemistry , statistics , mathematics , optoelectronics , engineering
The effect of powder characteristics on the microstructures and dieletric properties of (Ba,Nb)‐doped TiO 2 ceramics was investigated. Two powders were prepared: one by coprecipitation and the other from mixing of reagent oxides. The powder characteristics were determined by TEM, X‐ray powder diffraction, SEM, and centrifugal particle analysis. Extensive abnormal grain growth is observed in samples sintered from coprecipitated powder, while it is not found in samples sintered from reagent oxide powder. The effects of crystallite size, agglomerate distribution, and chemical homogeneity on abnormal grain growth are discussed. A mechanism of abnormal grain growth is given, and chemical homogeneity is determined to be the main factor which caused abnormal grain growth. The effect of powder characteristics on dielectric properties is also described.