CHARACTERIZATION AND INVESTIGATION TRIPLE SYSTEM Ho-As-Te BY THE CROSS SECTION OF As2Te3-Ho2Te3 AND HoAs-Te

Abstract

It has been investigated and construced T-X diagram in the triple system Ho-As-Te in the cut of As2Te3-Ho2Te3 and HoAs-Te by the trivial complex methods of physico-chemical analysesdifferential-thermal (DTA), X-ray phase (RFA), microstructure (MSA), microhardness and density. It has been determinated that the As2Te3-Ho2Te3 system is quasi-binary and participated in the triangulation of the ternary system. An incongruent compound is formed in the system, containing HoAsTe3 at 1050 K in a 1:1 component ratio and a solid solution of 5 mol.% Ho2Te3 at room temperature based on As2Te3. It has been determinated the crystal chemical parameters of the HoAsTe3 compound. The HoAsTe3 compound crystallizes in tetragonal systems, lattice parameters: a=17.81, c=11.58 Å, density: ρrent=5.91, ρpik=5.85 g/cm3. The HoAs-Te cross section is non-quasi-binary and passes through the region of 4 subordinate triangles of the ternary system.