Thermodynamic properties of the gaseous lead phosphates

• Gaseous lead phosphates PbPO2, PbPO3 and PbP2O6 were produced and identified.
• Their thermodynamic properties were studied using both high temperature mass spectrometry and quantum chemistry computations.
• The obtained data allows to predict the formation enthalpies of gaseous lead salts.

Wide use of phosphates in different areas motivates interest to investigation of these compounds. Knudsen effusion mass spectrometry was used to study thermodynamic properties of gaseous lead phosphates. On the basis of the measured constants of the equilibrium of gas-phase reactions the standard formation enthalpies of PbPO2, PbPO3 and PbP2O6 have been defined. For these gaseous lead phosphates thermodynamic function were calculated by statistical thermodynamic method in “rigid rotor-harmonic oscillator” approximation. The molecular parameters obtained by different quantum chemistry method.