Abstract
Raman (Ra) and infrared (ir) spectra of Co 2P 2O 7·6H 2O are interpreted using factor group analysis. No coincidences of most of Raman and infrared spectra bands confirms a centrosymmetric structure for this salt. The vibrational spectra point to a bent POP bridge angle in this compound. Thermal dehydration of Co 2P 2O 7·6H 2O in the range 25–800 °C was investigated by thermogravimetric analysis (TG and DSC), and infrared spectroscopy. According to the TG–DSC curves, the dehydration takes place in two stages. The results of the thermal analysis of the compound (heated at different temperatures) showed that, after dehydration, Co 2P 2O 7·6H 2O first decomposes in Co 2P 2O 7·2H 2O, then in an amorphous product, which crystallizes at 592 °C giving rise to the anhydrous form α-Co 2P 2O 7. The Δ H enthalpy of the dehydration and phase transition of the Co 2P 2O 7·6H 2O salt has been calculated from the thermogravimetric data.
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