Study on Tellurium Vapor Composition by Static Method
The static method using a zero-manometer enables with high accuracy to perform measurements of the vapor pressure. The data on the temperature dependence of the substance non-saturated vapor (the condensed phase is absent) in the static experiment allow the determination of the vapor composition. In this work a multi-component system, consisting of molecules, containing the i -th quantity of atoms, has been considered. The mathematical regularities during studying molecular composition of multicomponent vapor have been developed. Jointly with the initial equations the system of n linear equations with n unknowns has been obtained. The system of equations is compatible and has only one solution, as a determinant, composed by the coefficients at unknown partial pressure of the components, differs from zero. The tellurium vapor composition has been investigated by the experimental static method. It has been shown that the tellurium vapor mainly consists of the equilibrium of one-, two- and four atom molecules Te2 =2Te and Te4 =2T2. The processing of the obtained experimental data has enabled to obtain the equations of the temperature dependence of the constants and to reveal the change of the tellurium average number of atoms in a gas phase in a broad interval of pressures and temperatures.