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- W4251034719 abstract "Abstract Crystals of tricalcium germanate having a monoclinic structure and a rhombohedral one have been obtained, the former being denoted C 3 G – 3 M and the latter C 3 G – 9R. The crystal data are: C 3 G – 3 M: a = 12.546(2), b = 7.196(2), c = 9.515(2) Å, β = 116.43(2)°, space group P 2 1 / m and cell contents 6×Ca 3 GeO 5 , C 3 G – 9R: a = 7.190(2), c = 25.243(3) Å, space group R 3 m , cell contents 9 × Ca 3 GeO 5 with A1 2 O 3 1.2 wt%. Both structures have been determined based on diffraction intensities measured with a single-crystal diffractometer giving final values of R = 3.9% and R = 5.9%, respectively. Compared with other tricalcium silicates and germanates, the degree of orientational disorder of the GeO 4 tetrahedra of C 3 G –9R widely spread from highly ordered state to highly disordered. Unlike the case of the rhombohedral phase of tricalcium silicate, the GeO 4 tetrahedra of C 3 G –9R are not tilted with respect to the threefold axis. While all the cations and all the separate oxygens show splittings in C 3 G –9R, only one of the three separate oxygen atoms is split in C 3 G –3M. The mean coordination numbers of C 3 G –3M and C 3 G –9R are 6.10 and 5.94, respectively. The distortions of the polyhedra about Ca's in C 3 G – 3M are larger than those in C 3 G – 9 R, consisting with the earlier observation that C 3 G – 9 R is stable at higher temperatures than C 3 G–3M." @default.
- W4251034719 created "2022-05-12" @default.
- W4251034719 date "1986-10-02" @default.
- W4251034719 modified "2023-09-26" @default.
- W4251034719 title "Structures of two modifications of Ca3GeO5" @default.
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- W4251034719 doi "https://doi.org/10.1524/zkri.1986.176.3-4.303" @default.
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