Further insights on the thermal degradation of aluminum metaphosphate prepared from aluminum dihydrogen phosphate solution

A study of the high temperature (up to 1200 °C) degradation of aluminum metaphosphate Al(PO3)3 has been carried out to evaluate the stability of this compound used for many purposes. For the preparation of Al(PO3)3, an aluminum dihydrogen-phosphate Al(H2PO4)3 solution has been heated at 700 °C. Ther...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2021-08, Vol.41 (9), p.4970-4976
Main Authors: Rousseau, Guillaume, Montagne, Lionel, Méar, François O.
Format: Article
Language:English
Subjects:
31P MAS NMR
Aluminum metaphosphate
Chemical Sciences
Hydroxyl groups
Inorganic chemistry
Thermal degradation
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Summary:A study of the high temperature (up to 1200 °C) degradation of aluminum metaphosphate Al(PO3)3 has been carried out to evaluate the stability of this compound used for many purposes. For the preparation of Al(PO3)3, an aluminum dihydrogen-phosphate Al(H2PO4)3 solution has been heated at 700 °C. Thermal degradation of Al(PO3)3 has been followed through the measurement of weight loss on isothermal mode at 1000 and 1200 °C and by thermogravimetric analysis coupled with mass spectroscopy (TGA-MS). Structural data have been obtained by 27Al, 31P and 1H MAS NMR spectroscopy. NMR analyses have shown that [A] and [B] allotropic forms of Al(PO3)3 are formed after the preparation procedure. In addition, NMR revealed that hydroxyls groups are also present in the sample, and they form POH groups. TGA-MS showed that they are decomposed at a temperature of 875 °C, while the decomposition of Al(PO3)3 into AlPO4 and P2O5 begins at 1000 °C.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2021.03.023