Abstract
The sound velocity and magnetic susceptibility as a function of temperature and composition were measured to investigate critical sound wave propagation and metal-non-metal transition in the liquid Sb-Sb2S3 system. The sound velocity in a homogeneous alloy around 60 at.% of Sb decreases very rapidly and the rate of decrease increases as the two melts phase is approached, which is the typical temperature dependence of the sound velocity in a liquid with a miscibility gap. Below the critical point, the sound velocity was measured along the phase boundary. Using those data, the phase boundary was precisely determined. The critical point is located at 901±2 o C and 41.5 ±0.5 at.% S, and the critical exponent of the phase boundary is about 1/3. On the other hand, the magnetic susceptibility as a function of temperature and composition indicates that the electronic state is metallic in liquid Sb and non-metallic in molten Sb2Se3, and crossover form the metallic to non-metallic state occurs around the critical composition.
Highlights
Experimental procedureThere reported many binary elemental systems which have miscibility gaps in the liquid state
The critical sound propagation in alloy close to a critical composition has been observed as the temperature is approached to the two-melt critical point from above
The sound velocity along the phase boundary has not been determined, because such measurements are timeconsuming and it is not known the characteristics of the sound velocity along the phase boundary so far
Summary
Experimental procedureThere reported many binary elemental systems which have miscibility gaps in the liquid state. This system has two immiscible regions between Ag-Ag2Se and Ag2Se-Se. For both immiscible regions, the critical sound propagation in alloy close to a critical composition has been observed as the temperature is approached to the two-melt critical point from above.
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