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Liquid-phase sintering and chemical inhomogeneity in the BaTiO3–BaCO3–LiF system

Published online by Cambridge University Press:  31 January 2011

Sea-Fue Wang ,
Thomas C. K. Yang ,
Wayne Huebner  and
Jinn P. Chu
Sea-Fue Wang
Affiliation:
Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, Republic of China
Thomas C. K. Yang
Affiliation:
Department of Materials and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan, Republic of China
Wayne Huebner
Affiliation:
Ceramic Engineering Department, University of Missouri—Rolla, Rolla, Missouri 65401
Jinn P. Chu
Affiliation:
National Taiwan Ocean University, Institute of Materials Engineering, Keelung, Taiwan, Republic of China
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Abstract

An ongoing goal of multilayer capacitor research is to lower the firing temperature of the dielectric. This paper gives a detailed study of sintering BaTiO3 with LiF flux, which lowers the firing temperature through liquid-phase sintering. A detailed set of experiments is discussed concerning microstructural evolution and corresponding dielectric properties under a number of processing variables, including amount of LiF, sintering temperature, and particle size. Different scales of chemical inhomogeneity were observed in this system, which reflect two underlying mechanisms: solution reprecipitation with limited grain growth at low temperatures, which resulted in distinct core–shell structures, and flux volatility, which gave rise to microscopic chemical inhomogeneity at higher sintering temperatures.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 407 - 416
Copyright
Copyright © Materials Research Society 2000

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