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|Title:||31P nuclear magnetic resonance and X-ray diffraction study of Na-Sr-phosphate glass-ceramics|
|Author(s):||Pires, R. A.|
Nunes, Teresa G.
Hawkes, G. E.
X-ray powder diffraction
|Journal:||Key Engineering Materials|
|Abstract(s):||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.|
|Appears in Collections:||3B’s - Artigos em revistas/Papers in scientific journals|