Abstract
Compound Mg2Ta2O7 crystallizing in the structure of cubic pyrochlore and stable in the temperature range from 1400°C to the melting point has been synthesized. The phase formation in the Mg2Ta2O7 – Nd3TaO7 system in the temperature range from 1300°C to the melting point has been studied. The formation of Mg2Ta2O7-based cubic solid solutions extending to 35 mol.% Nd3TaO7 has been established. A phase of varying composition with a fluorite-like structure stable to 1500 – 1550°C in the concentration range of 43 to 67 mol.% Nd3TaO7has been identified.
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