A knudsen cell-mass spectrometer study of the vaporization of cesium telluride and cesium tellurite

Thermodynamic assessment of the Cs–Te binary system

“…The thermodynamic properties of the gaseous species CsTe 2 observed by two groups of authors [30,44] have not been determined in TBASE [38]. This species is taken into account in this work based on the data of Appendix A.11 in Drowart and Smoes [30].…”

“…The vaporization of stoichiometric Cs 2 Te has been studied by both Portman et al [44] and Drowart and Smoes [30]. -The three major species in [44] are Cs, Cs 2 Te 2 and Te with a ratio P(Cs)/P(Cs 2 Te 2 )E 2.5, the other minor species being CsTe 2, CsTe, Te 3, Cs 2 Te and Te 2 by order of decreasing abundance, -The three major species in [30] are Cs, Cs 2 Te 2 and CsTe with a ratio P(Cs)/P(Cs 2 Te 2 )E1, the minor species being CsTe 2 and Cs 2 Te by order of decreasing abundance.…”

“…-The three major species in [44] are Cs, Cs 2 Te 2 and Te with a ratio P(Cs)/P(Cs 2 Te 2 )E 2.5, the other minor species being CsTe 2, CsTe, Te 3, Cs 2 Te and Te 2 by order of decreasing abundance, -The three major species in [30] are Cs, Cs 2 Te 2 and CsTe with a ratio P(Cs)/P(Cs 2 Te 2 )E1, the minor species being CsTe 2 and Cs 2 Te by order of decreasing abundance. Portman et al mentioned overlap between peaks in the mass spectra and difficulties in calibrating their quadrupole spectrometer resulting in large errors in the determination of partial pressures of species of molecular weight much above 300.…”

“…Johnson and Johnson [42] observed the presence of CsTe in the gas by mass spectrometry. Wren et al [43] and Portman et al [44] reported the enthalpy of vaporization of the following species in the gas: Cs, Te, Te 2 , Te 3 , CsTe and Cs 2 Te. In 1992, the study of Drowart and Smoes [30] has shown the presence of the following species in the vapour: Cs, Te,Te 2 , CsTe, Cs 2 Te, CsTe 2 , Cs 2 Te 2 , and Cs 2 Te 3 .…”

Matrix-isolation studies on the vaporisation of alkali-metal tellurites: the characterisation of molecular M2TeO3 species (M = K, Rb or Cs)

“…Two Knudsen-cell mass spectrometric studies of the vaporisation of caesium tellurite have been reported. The first of these 8 established the existence of Cs 2 TeO 3 as a probable molecular species, and obtained the standard enthalpy of vaporisation, whilst a more recent paper 9 established the congruent vaporisation of caesium tellurite and also studied the thermal dissociation of caesium tellurate. A calculation of the entropy of the gaseous ion TeO 3 2Ϫ has been reported 10 based on data taken from the solid phase.…”