Solid State Reaction between Barium Titanate and Strontium Titanate

The first stage of the sintering process between barium titanate and strontium titanate powders, which are responsible for the formation of solid solution, was investigated. We measured the variation of permittivity vs . temperature characteristics and crystal structure of the mixtures, with sintering conditions. The shift of the effective Curie temperature and the broadening of diffracted lines were observed in the transient states of the reaction. A diffusion mechanism was introduced in order to interpret these phenomena qualitatively.