Abstract
The coexistence curve of EuNH 3 solutions has been determined by visual observation and electron paramagnetic resonance (EPR). A nonmetal-metal transition is evident in EuNH 3 solutions, and the miscibility gap is the most pronounced among the metal-ammonia ( MNH 3) systems that have been studied. The critical concentration and temperature are 1.30 mole% metal and 321 K, respectively. The coexistence curve has a parabolic shape within close vicinity of the critical point, which strongly suggests the existence of long-range interactions and cluster formation. EPR spectra indicate that the cation-electron interactions in these solutions are weak, so that the valence-electron concentration in MNH 3 solutions is probably the primary factor in determining the nature of the nonmetal-metal transition. The coexistence curve and associated critical parameters for EuNH 3 solutions are compared to those obtained for other MNH 3 solutions.
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