Role of Liquid Phase in Achieving a Fine Microstructure and Diffusive Phase Transition of MgO-Doped BaTiO3
January 28, 2010
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
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.