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Phase Equilibria in the System Barium Titanate—Strontium Titanate

1992; Wiley; Volume: 75; Issue: 4 Linguagem: Inglês

10.1111/j.1151-2916.1992.tb04170.x

1551-2916

B. A. Wechsler, Kevin W. Kirby,

Thermal and Kinetic Analysis

Phase equilibria in the system BaTiO 3 –SrTiO 3 (with 0 to 7 mol% SrTiO 3 ) were studied at temperatures above 1600°C in air. Quenching experiments were performed using high‐purity starting materials, and run products were examined by X‐ray diffraction and differential scanning calorimetry to determine phase composition and Sr concentration. Melting involves a binary loop intersected by the invariant reaction hexagonal (Ba, Sr)TiO 3 ( ss ) ⇌ cubic (Ba, Sr)TiO 3 ( ss ) + liquid. In contrast with earlier work, these results indicate that there is no depression of the melting point with Sr addition and no congruent melting point in this compositional range.