Thermodynamic properties of the gaseous lead phosphates

Thermodynamic properties of gaseous cerium phosphate studied by Knudsen effusion mass spectrometry

“…Unfortunately, the intensity of CePO 2 + was too low to measure an exact value of its AE. However, by analogy with molecular ions, MPO 2 + (M = Ca, Sr, Ba, Sn, Pb, V, Cr, Mn, Fe, Ni, Co, and Eu) produced in similar systems, and the absence of the CePO 3 + ion with higher m/z value in mass spectra we can conclude that CePO 2 + is a product of the direct ionization of CePO 2 molecule. Analysis of the vapor mass spectra and the values of the AEs of the PO + , PO 2 + , CeO + , and CeO 2 + ions shows that the vapor above the system CeO 2 ‐Mg 2 P 2 O 7 consists of PO, PO 2 , CeO, CeO 2 , and CePO 2 .…”

“…By now existence and stability of gaseous europium, gallium, indium, germanium, tin, lead, some 3d‐elements, alkali, and alkali earth phosphates were reported.…”

“…These values were recalculated to 298 K and equal (−346 ± 11 kJ ⋅ mol −1 ). The combination of this value with Δ f H 0 (CeO, gas, 298 K) (−134.0 ± 5.0 kJ⋅mol −1 ) 51 and Δ f H 0 (PO, gas, 298 K) (−28 ± 5 kJ⋅mol −1 ) 29 determined in the present work allowed us to obtain the standard formation and atomization enthalpies for CePO 2 , gas, 298 K (−508 ± 12 kJ ⋅ mol −1 ) and (1745 ± 13 kJ ⋅ mol −1 ), respectively.The reliability of determined enthalpies of reaction(8) by Equation 9 is connected with the precision of determination of equilibrium constants (K eq ) and free energy functions (Φ 0 (Т)). At 100% relative error of determination of equilibrium constant the value of…”