Solid Solubility and Polymorphism in the System Sr 2 SiO 4 ‐Sr 2 GeO 4 ‐Ba 2 GeO 4 ‐Ba 2 SiO 4
Abstract
The reciprocal salt pair Sr 2 SiO 4 ‐Sr 2 GeO 4 ‐Ba 2 GeO 4 ‐Ba 2 SiO 4 was investigated using X‐ray powder diffraction and DTA. Unlimited solubility in the low‐K 2 SO 4 structure type (α′) occurs throughout the system above 85°C. The nonlinear changes of some lattice constants of the solid solutions are discussed. A stable monoclinic low‐temperature (β) form of Sr 2 SiO 4 was found which converts reversibly to the high‐temperature α′‐modification at 85°C. The enthalpy of the β‐α’ transition is 51 cal/mol. In the reciprocal salt pair the β‐form solid solutions occur in a very narrow region below 85°C.
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