Abstract
The solid solubility of CaTiOGeO 4 with CaZrOGeO 4 and the structural phase transitions occurring in this solid solution as a function of temperature and composition were examined using in situ high temperature X-ray powder diffraction. Structural phase transitions were identified based on the determination of spontaneous strain. The transition P 2 1 / a - A 2/ a , which is typical for titanite and CaTiOGeO 4 , was observed in samples with Zr concentrations up to 10%. The addition of Zr destabilizes the ordered P 2 1 / a phase and T c decreases accordingly. The aristotype structure of titanite in space group symmetry A 2/ a was observed for intermediate compounds. Compounds with high Zr contents exhibit a triclinically distorted titanite structure. Their structure was modeled in space group A 1. The triclinic structure appears at Zr contents of about 70% with T c close to ambient temperature. Further increase of the Zr content stabilizes the triclinic structure and leads to an increase of T c up to T c = 488 K in CaZrOGeO 4 .
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