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XRD and Solid-State NMR Study of Magnesium Oxide–Magnesium Orthophosphate Systems

✍ Scribed by Maria Angeles Aramendı́a; Victoriano Borau; César Jiménez; José Maria Marinas; Francisco José Romero; José Rafael Ruiz

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
259 KB
Volume
135
Category
Article
ISSN
0022-4596

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✦ Synopsis

Various magnesium oxide-magnesium orthophosphate systems in different Mg/P ratios were synthesized and examined by XRD and 1 H and 31 P MAS NMR. The results thus obtained are compared with those for commercially available pure MgO and Mg 3 (PO 4 ) 2 . The crystallization temperature of magnesium orthophosphate was found to increase with increasing MgO content in the sample. The NMR technique revealed the absence of interactions between the two species. 31 P MAS NMR allowed the amorphous-to-crystalline ratio for magnesium orthophosphate in solids calcined at different temperatures to be determined. Also, 1 H MAS NMR revealed the qualitative nature of hydroxyl sites in the solids.

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