Abstract
The solid solutions of the Cd3P2-Zn3P2 system have been prepared by either a direct melting method or a sintering method, and their physical, electrical and thermal properties have been measured. The main results are as follows:
The Cd3P2-Zn3P2 system is pseudo-binary, and a continuous series of solid solutions having lattices of tetragonal symmetry is formed throughout the whole range of composition. However, in the temperature range above the solidus line of the system, the phase diagram would be rather complicated, probably being influenced by the intricate phases at high temperatures of the Cd3P2 composition. The Cd3P2-Zn3P2 system has two solid phase transformations. The one is a kind of polymorphic transformations which occurs over the whole composition range above 730°C, and the other is probably a second order transformation which exists in the composition range from about 10 to 50 mol%Cd3P2 below about 500°C. The transition of the type of conductivity in the system takes place at a composition between 40 and 50 mol%Cd3P2. All the solid solutions show rather low total thermal conductivities of 0.012∼0.024 W/cm·deg at room temperature.
