Phase Relations in the Ca 2 Ta 2 O 7 -Nd 3 TaO 7 System.-The phase relations in the title system from 1200 • C to the melting point are studied by X-ray methods. The existence of four modifications of Ca 2 Ta 2 O 7 with distorted pyrochlore structure and a high-temp. modification with perovskite-type layer structure is established. Moreover, the existence of a 2:1 compound (Ca 4 Nd 3 Ta 5 O 21 ) with cubic pyrochlore structure and a 1:2 compound (Ca 2 Nd 6 Ta 4 O 21 ) having a rhombic, distorted defect fluori…
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