Grain Boundary Migration Induced by Alloying of PbTiO<TEX>$_3$</TEX> in BaTiO<TEX>$_3$</TEX> Ceramics

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J. Korean Ceram. Soc. > Volume 36(4); 1999 > Article

Journal of the Korean Ceramic Society 1999;36(4): 354.

PbTiO$_3$첨가에 의한 BaTiO$_3$의 입계이동

이호용, 김재석, 강석중¹

선문대학교 재료금속공학부
¹한국과학기술원 재료공학과

Grain Boundary Migration Induced by Alloying of PbTiO$_3$ in BaTiO$_3$ Ceramics

ABSTRACT

When PbTiO3 particles were scattered on a polished surface of sintered BaTiO3 and annealed at 125$0^{circ}C$ cchemically induced grain boundary migration of BaTiO3 grains occurred near the scattered PbTiO3 particles In some BaTiO3 grain surfaces chemically induced recrystallization was also observed. During the annealing the scattered PbTiO3 particles changed to a (Ba0.6Pb0.4)TiO3 solid solution by diffusion of Ba from the sint-ered BaTiO3. The coherency strain energy of a coherent (Ba0.8Pb0.2)TiO3 layer on BaTiO3 was calculated to be between 1.94 and 3.11 [MJ/m3] depending on crystallographic orientation. The experimental results and calculation showed that the chemically induced grain boundary migration could be induced in BaTiO3 with low elastic constants when the amount of solute alloying was high enough

Key words: Chemically induced grain boundary migration, Chemically induce recrystallization, Coherency strain energy BaTiO$_3$, PbTiO$_3$