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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

O'Dell, Luke A. and Guerry, Paul and Wong, Alan and Neel, Ensanya A. Abou and Pham, Tran N. and Knowles, Jonathan C. and Brown, Steven P. and Smith, Mark E. (2008) Quantification of crystalline phases and measurement of phosphate chain lengths in a mixed phase sample by P-31 refocused INADEQUATE MAS NMR. Chemical Physics Letters, 455 (4-6). pp. 178-183.

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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.

Item Type: Article
Journal or Publication Title: Chemical Physics Letters
Subjects: UNSPECIFIED
Departments: VC's Office
ID Code: 52846
Deposited By: ep_importer_pure
Deposited On: 29 Feb 2012 09:04
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 23:10
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/52846

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