T he phase equilibrium diagram for the system Nb,Os-GeO, has been dete rmined experimentally, using the quenc hing tec hnique and examining the samples by optical microscopy and xray powder diffractometry. The system contains one compound, 9Nb,Os' GeO" wh ic h melts Inco ngruently at 1420 0c. A eutectic be tween this compou nd and GeO, is located at about 97 mol pe rcent GeO, and 1090 C . The system doe s not show liquid immiscibility, and it is concluded that the ionic fi eld strength limit for twoliquid separation in the series of glass form ers occurs with the Nb+ s cation .
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Ernest M. Levin (1966) studied this question.
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