Effect of atmosphere on the vaporization behavior of CsFeSiO4

Effects of atmospheres on the vaporization behavior of Cs chemisorbed compound CsFeSiO4 was experimentally investigated. A pure CsFeSiO4 sample was synthesized by a powder metallurgical route and was subjected to the thermogravimetric analysis. Weight loss of CsFeSiO4 was larger in the order of those under Ar-5 %H2 and Ar-5 %H2O-5 %H2, Ar-5 %H2O, Ar and air. This would correspond to the varied vapor pressures of CsFeSiO4 by different oxygen potentials in the atmospheres. On the other hand, larger weight losses under H2 containing atmospheres were observed regardless of the oxygen potential. An X-ray diffraction analysis and a chemical equilibrium calculation have indicated the possible decomposition of CsFeSiO4 by the interaction with H2 in the vapor phase.