Abstract
AbstractThe formation of four hitherto unknown lead tellurium oxides – PbTeO3, PbTe2O5, Pb2TeO4 and Pb2Te2O6 – was observed in the gas phase by means of a mass‐spectrometric Knudsen‐cell method. Other ternary oxides of group 14–16 elements were not observed in the gas phase. The enthalpies of formation for these oxides were obtained experimentally by means of a mass‐spectrometric Knudsen‐cell method and confirmed theoretically by using quantum chemical (QC) calculations. Appearance potential measurements were conducted for PbTeO3 and Pb2TeO4. The structures of the ternary oxides that represent the minima on the potential‐energy surfaces were found by using QC calculations. The behaviour of the related compounds PbTeO3, X2O3, Pb2Te2O6 and X4O6 in the gas phase has been discussed (for which X = P, As, Sb, Bi).
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