Gaseous CePO has been identified by Knudsen effusion mass spectrometry during vaporization of CeO and magnesium diphosphate from tungsten double, two-temperature effusion cell. Structure and molecular parameters of gaseous cerium phosphate under study were determined using quantum chemical calculations. On the basis of equilibrium constants measured for gas-phase reaction, standard formation enthalpy of CePO was determined to be -508 ± 41 kJ ⋅ mol at the temperature 298 K.
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