Thermodynamics of sublimation and crystal chemistry of Tm0.77Te

Article abstract of DOI:10.1016/0022-5088(89)90217-8

The congruent vaporization of solid Tm_0.77Te (rhombohedral, with hexagonal lattice parameters a = 430.9 pm, c = 1083.8 pm) was investigated by the Knudsen effusion weight-loss technique over the temperature range 1624 - 1798 K. Using literature data for the enthalpies of dissociation of gaseous TmTe and Te₂ and for the free energy functions of gaseous TmTe, Te₂, thulium and tellurium, an equation for vaporization to the atoms is given. A vapor pressure equation is provided. Second and third law calculations based on estimated thermodynamic data for Tm_0.77Te yielded the standard enthalpies and entropies of reaction. The crystal chemistry and thermochemical properties are discussed.