Abstract
The binary system CdO-Nb/sub 2/O/sub 5/ was studied using quenching methods and sealed platinum tubes. Pure CdO and samples containing free CdO showed a decrease of crystallinity of the CdO structure with grinding, and attempts to determine the melting point of pure CdO up to 1500 deg C resulted only in sublimation. Two compounds are formed in the system, 2CdO - Nb/sub 2/O/ sub 5/, and CdO - Nb/sub 2/O/sub 5/, and their structures are reported. The eutectic compositions for the pairs 2CdO - Nb/sub 2/O/sub 5/-CdO - Nb/sub 2/O/sub 5/ and CdO - Nb/sub 2/O/sub 5/-Nb/sub 2/O/sub 5/ a re estimated to lie at 66.7 to 60 and 33.3 mole% CdO, respectively; the eutectic composition and temperature for the other pair, CdO -2CdO - Nb/sub 2/O/sub 5/, could not be determined. Liquidus data were difficult to obtain because of the high volatility and fluidity of CdO at high temperatures. A phase equilibrium diagram with tentative liquidus curves is presented. (D.L.C.)
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