Author/Authors :
O’Dell، نويسنده , , Luke A. and Guerry، نويسنده , , Paul and Wong، نويسنده , , Alan and Abou Neel، نويسنده , , Ensanya A. and Pham، نويسنده , , Tran N. and Knowles، نويسنده , , Jonathan C. and Brown، نويسنده , , Steven P. and Smith، نويسنده , , Mark E.، نويسنده ,
Abstract :
A 31P 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 β-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 31P MAS NMR chemical shifts of which have been identified in the correct sequence along the chain.
