31P nuclear magnetic resonance and X-ray diffraction study of Na-Sr-phosphate g...

• Autor(es): Pires, R. A. ; Abrahams, I. ; Nunes, Teresa G. ; Hawkes, G. E.
• Data: 2004
• Identificador Persistente: http://hdl.handle.net/1822/17595
• Origem: RepositóriUM - Universidade do Minho
• Assunto(s): Glass-ceramics; Phosphates; NMR; X-ray powder diffraction
• Tipo de Documento: Artigo
• Idioma: Inglês

Descrição

A set of Na-Sr-phosphate glass and glass-ceramic samples, with general formula xSrO:(0.55-x)Na2O:0.45P2O5, were prepared and analysed by solid state 31P nuclear magnetic resonance spectroscopy and X-ray powder diffraction. The results show the presence of Q1 and Q2 phosphate species in all samples. At low concentrations of Sr2+ (x £ 0.20) the strontium is preferentially incorporated in Sr2+-Q1 crystalline phases, and only at higher Sr2+ concentrations are crystalline phases present which Sr2+ is associated with Q2 phosphate units.