On the system Sr/Mo/O: Phase diagram, synthesis and characterization of ternary compounds

The phase diagram of the ternary system Sr/Mo/O has been determined at a temperature of 1000 degrees C. Powder samples of the ternary compounds SrMoO4, Sr3MoO6, SrMoO3, Sr2MoO4 and SrMo5O8 were prepared by solid state reactions. The thermochemical data of all ternary compounds were determined. A new compound, Sr3Mo2O7, With a layered perovskite structure (a = 3.967(1), c = 20.588(5) Angstrom, I4/mmm) was found. Rietveld analysis based on powder X-ray diffraction data confirms that the compound Sr2MoO4 has the K2NiF4 structure (I4/mmm) with a = 3.9176(1), c = 12.8545(4) Angstrom.

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