THE CADMIUM-ZINC PHASE-DIAGRAM UNDER HIGH-PRESSURE

Phase relation of the Cd-Zn system at various pressures up to 7.0 GPa was determined by means of isobaric measurement of electrical resistan ce and in-situ X-ray diffraction analysis. The eutectic temperature an d melting temperatures of cadmium and zinc increase under pressure wit h mean values of the slopes (Delta T/Delta P)(P = 0-7 GPa) of 26 degre es C/GPa, 48 degrees C/GPa and 38 degrees C/GPa, respectively. The eut ectic composition moves toward Zn-rich phase from 26.6 at% Zn at atmos pheric pressure to 58 at% Zn at 6.0 GPa. The maximum solubility of zin c in the alpha phase (hcp solid solution on the Cd-rich side) and that of cadmium in the beta phase (hcp solid solution on the Zn-rich side) expand slightly under high pressure. Isobaric temperature-composition sections of the three-dimensional equilibrium phase diagram of the Cd -Zn system up to 7.0 GPa are constructed on the basis of the results.