Abstract
The new ternary compounds Na1.5Te2Mo0.5O6.25 and K6(Te94+Te6+)Mo6O42 have been revealed by the study of the phase relation in the systems Na2O–TeO2–MoO3 and K2O–TeO2–MoO3. The structure of the compounds has been investigated by X-ray Single-Crystal Analysis. The Na1.5Te2Mo0.5O6.25 compound belongs to anti-glass tellurium phase with fluorite-type structure and space group Fm3‾m, Z = 1, a = 5.4087 Å, where the oxygen atoms are strongly disordered near the 8a site. The K6(Te94+Te6+)Mo6O42 mixed-valence tellurium compound possesses trigonal space group P3‾, Z = 1, a = 12.0074 Å, c = 7.8979 Å. The K6(Te94+Te6+)Mo6O42 structure contains rare units of two [TeO6] octahedron sharing three common oxygen. The decomposition temperatures are 378 °C and 410 °C for Na1.5Te2Mo0.5O6.25 and K6(Te94+Te6+)Mo6O42, respectively.
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