Mass spectrometric study of vapor composition over germanium telluride

The vapor phase over germanium telluride was studied by Knudsen cell mass spectrometric measurements. All of the signals in its mass spectrum were identified for the first time. The GeTe+, Te-2(+), Te+, Ge+, and GeTe2+ appearance potentials and temperature-dependent (700-850 K) GeTe and Te-2 partial pressures were refined (for the first time for GeTe2). Conclusive evidence is presented that germanium telluride sublimes incongruently.