Abstract
Phase relations in the system BaOGeO 2 were investigated in the pressure range 20–70 kbar in the temperature range 750–1200°C. Several new phases were identified in this system: an atmospheric phase of BaGe 2O 5 (monoclinic BaGe 2O 5 I), two high-pressure phases of BaGe 2O 5 (monoclinic BaGe 2O 5 II and tetragonal BaGe 2O 5 III), and a high-pressure phase of Ba 2Ge 5O 12. The phase boundary curve between BaGe 2O 5 II and BaGe 2O 5 III was preliminarily determined as P(kbar) = 7.7 + 0.047 T (°C). The high-pressure phases of BaGeO 3, which were previously reported by Y. Shimizu, Y. Syono, and S. Akimoto ( High Temp.-High Pressures 2, 113 (1970)) in the pressure range 15–95 kbar, were interpreted to be not single-phase materials but complicated mixtures of more than two phases in the system BaOGeO 2. X-Ray powder diffraction data for the new compounds synthesized in this study are given.
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