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- W1970264132 abstract "The vaporization of solid alkali metal phosphides, Na3P7, K3P7, Rb3P7 and Cs3P7. has been characterized using the Knudsen effusion technique in combination with a quadrupole mass spectrometer and a thermobalance. Mass spectra correlated with previous accounts of the sublimation of phosphides and thermodynamic calculations show that the vapor species above these compounds are the monatomic alkali metals, P4(g) and P2(g). These compounds were found to sublime congruently according to the general reaction M3P7(s) = 3M(g) + 7/4p4(g) where M = Na, K, Rb, Cs. Total pressures were determined from mass-loss data and second-law entropies and enthalpies of sublimation were also calculated. The standard enthalpies of formation, ΔHo298.f, for Na3P7(s), K3P7(s), Rb3P7(s) and Cs3P7(s) were found to be −119 ± 10, −114 ± 16, −118 ± 8 and −66 ± 6 kJ mol−1, and the standard entropies, So298, of these compounds are 509, 612, 689 and 756 J K−1 mol−1. respectively. The large entropy contribution to the stability of these compounds makes them unique among alkali metal phosphides. The values of ΔH0T and ΔS0T for the crystalline to plastically crystalline phase transition were found to be 35.5 kJ mol−1 and 47 J K−1 mol−1 (Na3P7), 10.1 kJ mol−1 and 19 J K−1 mol−1 (K3P7), 5.8 kJ mol−1 and 12 J K−1 mol−1 (Rb3P7), and 19.6 kJ mol−1 and 35 J K−1 mol−1 (Cs3P7), respectively, by DSC measurements." @default.
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- W1970264132 date "1986-02-01" @default.
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- W1970264132 title "The sublimation and thermodynamic properties of the alkali metal phosphides Na3P7(s), K3P7(s), Rb3P7(s) and Cs3P7(s)" @default.
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- W1970264132 doi "https://doi.org/10.1016/0040-6031(86)87100-3" @default.
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