Resumo

GARCIA, S. et al. Grain growth in polycrystalline Ba_0,5Sr_0,5TiO₃ ceramics prepared at different sintering times. Rev. mex. fis. [online]. 2003, vol.49, n.1, pp.15-19. ISSN 0035-001X.

A grain size study based on the measurements of the maximum permittivity and the microstructure of samples of Sr_0,5Ba_0,5TiO₃ sintered at different time lengths at a fixed temperature is reported. A linear law of grain growth is found from the experimental results and properly described by the Johnson-Mehl-Avrami theory. The model predicts a zero nucleation rate.

Palavras-chave : Grain size; sintering time; BST; dielectric permittivity.

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