Mass spectrometric investiaation into thermal decomposition of scandium, yttrium and lanthanum perrhenates in vacuum

the composition of gaseous phase during thermal decomposition of scandium, yttrium and lanthanum perrhenates in vacuum is studied by the mass spectrometric method. the character of processes in thermolysis is specified. on heating scandium, yttrium and lanthanum perrhenates no gaseous rhenium-containing compounds of these elements are prepared. scandium perrhenate decomposes during heating on sco and reo. yttrium and lanthanum perrhenates decompose with production of oxides of these matals, different rhenium- containing compounds, rhenium oxides and metallic rhenium. decomposition proceeds in a step-by-step the thermolysis product composition depends on temperature. thermal stability of perrhenates increases from scandium to lanthanum