Role of Liquid Phase in Achieving a Fine Microstructure and Diffusive Phase Transition of MgO-Doped BaTiO3

Volume 6 Issue 6, Pages 679 – 686

Shin-Tae Bae, Dong Kyun Yim, Kug Sun Hong, Jin-Soo Park, Hyunho Shin,
Hyun Suk Jung
Published Online: Nov 5 2008 3:15PM

DOI: 10.1111/j.1744-7402.2008.02319.x

ABSTRACT
Two types of glass compositions, with MgO and CaO modifiers,
respectively, were used to promote liquid-phase sintering of 2 mol%
MgO–BaTiO₃ at 1280°C in reducing atmosphere (pO₂=10⁻⁹ atm).
By combining the observations of the grain size of about 1 μm for both
specimens and the diffusive phase transition only when MgO modifier was
used, it has been interpreted that an appropriate solubility of BaTiO₃
is necessary to yield the fine and composite microstructures via a
dissolution–reprecipitation process. Further, a reasonable dopant
provision to BaTiO₃ has been shown to be
required to achieve the diffusive phase transitions.

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