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Quantification of crystalline phases and measurement of phosphate chain lengths in a mixed phase sample by P-31 refocused INADEQUATE MAS NMR

Research output: Contribution to Journal/Magazine › Journal article › peer-review

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  • Luke A. O'Dell
  • Paul Guerry
  • Alan Wong
  • Ensanya A. Abou Neel
  • Tran N. Pham
  • Jonathan C. Knowles
  • Steven P. Brown
  • Mark E. Smith
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<mark>Journal publication date</mark>1/04/2008
<mark>Journal</mark>Chemical Physics Letters
Issue number4-6
Volume455
Number of pages6
Pages (from-to)178-183
Publication StatusPublished
<mark>Original language</mark>English

Abstract

A P-31 refocused INADEQUATE pulse sequence has been used in combination with XRD to identify and quantify the crystalline phases present in a ternary sodium calcium phosphate ceramic of composition (CaO)(0.4)(Na2O)(0.1)(P2O5)(0.5). Both the NMR and XRD identified the two main phases present as NaCa(PO3)(3) and beta-Ca(PO3)(2). A third unidentified calcium phosphate phase was also observed by MAS NMR, featuring a chain of six crystallographically distinct PO4 units, the P-31 MAS NMR chemical shifts of which have been identified in the correct sequence along the chain. (C) 2008 Elsevier B.V. All rights reserved.