Phase Relations in the Tl9TbTe6-Tl9BiTe6 System andSome Properties of Solid Solutions

摘要

By using X-ray powder diffraction and differential thermal analyses, scanning electron microscopy technique and microhardness measurements the phase equilibria in the Tl_(9)TbTe_(6)-Tl_(9)BiTe_(6) system were investigated. According to the obtained experimental results the T-x diagram and concentration dependence of the cell parameters and microhardness of alloys of the Tl_(9)TbTe_(6)-Tl_(9)BiTe_(6) system were constructed. It is shown that the system is not quasi-binary due to the peritectic melting of Tl_(9)TbTe_(6), but stable below the solidus. In the system, it is found to be continuous solid solutions with Tl_(5)Te_(3) structure. These phases may be of interest to thermoelectric and magnetic materials.