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- W2950174080 abstract "Electronic structure calculations are carried out to estimate the heats of formation of rare-earth orthophosphates from their oxides. The calculated heats of formation are systematically about 40 kJ/mol less exothermic than the measured values. Based on estimated corrections for zero-point energies and H(298.15)-H(0), the discrepancy is almost entirely electronic in origin. The decreasingly exothermic {Delta}Hfox with decreasing ionic radius (i.e. LaPO4 more exothermic than ScPO4) results from the higher charge localization on the oxide anion (O2-) relative to the phosphate anion (PO43-). The lattice energy, of course, becomes more negative with decreasing ionic radius for both oxide and phosphate phases, but does so more rapidly for the oxide, making the reaction less exothermic as ionic radius becomes smaller. This effect should carry over to {Delta}Hfox other oxyacids, such as silicates and sulfates." @default.
- W2950174080 created "2019-06-27" @default.
- W2950174080 creator A5071845259 @default.
- W2950174080 date "2011-07-21" @default.
- W2950174080 modified "2023-09-27" @default.
- W2950174080 title "Density functional calculation of the heats of formation of rare-earth orthophosphates" @default.
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