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Effect of the Liquid‐Phase Characteristic on the Microstructures and Dielectric Properties of Donor‐ (Niobium) and Acceptor‐ (Magnesium) Doped Barium Titanate
Author(s) -
Yoon SeokHyun,
Lee JeHun,
Kim DohYeon,
Hwang g M.
Publication year - 2003
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.1151-2916.2003.tb03282.x
Subject(s) - materials science , acceptor , sintering , microstructure , barium titanate , grain growth , grain boundary , dielectric , doping , niobium , magnesium , electroceramics , ceramic , mineralogy , chemical engineering , metallurgy , chemistry , condensed matter physics , optoelectronics , medicine , microfabrication , physics , alternative medicine , pathology , fabrication , engineering
Changes in the microstructure and dielectric properties with the variation of the donor/acceptor ratio in BaTiO 3 ceramics were investigated. In donor‐rich specimens, a liquid that appeared during sintering did not penetrate into grain boundaries. However, in the acceptor‐rich specimens, the grains were separated by a liquid film during sintering. The much higher mobility of the liquid film than that of the grain boundaries was suggested to cause extensive grain growth in acceptor‐rich BaTiO 3 . The macroscopic homogenization of dopants because of grain growth in acceptor‐rich specimens resulted in changes in the dielectric properties.