Abstract
The NdAs2Se4-Nd2Se3 system was investigated by methods of differential thermal (DTA), X- ray phase (XRF), microstructural (MSA) analysis, as well as microhardness and density measurements, and a T-x phase diagram was constructed. It has been established that this system is a non-quasi-binary section of the ternary Nd-As-Se system. Above the solidus temperature (6750C) the NdAs2Se4-Nd2Se3 system is not quasi-binary, and below the solidus is stable. In the NdAs2Se4-Nd2Se3 system solid solutions based on the initial components are practically not detected.