Abstract
The thermal decomposition of Ca2Os2O7 by DTA, thermogravimetry and X-ray powder diffraction has been studied. Orthorhombic Ca2Os2O7 evolves oxygen slowly above 855± 5°C transforming into the intermediate orthorhombic Ca2Os2O7−x up to x ∼ 0.16. At x = 0.16–0.20 a new cubic phase begins to form. The cubic phase Ca2Os2O7−y has a pyrochlore structure type and its homogeneity region is spread to y ∼ 0.60. The cubic Ca2Os2O7−y stability is discussed. Above 1018 ± 7°C pyrochlores Ca2Os2O7−y decompose completely into CaO, osmium metal, osmium tetroxide and oxygen.
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