A MAS-NMR and Combined Rietveldt Study of Mixed Calcium/Strontium Fluorapatite Glass-Ceramics

Characterisation of fluorine containing glasses and glass-ceramics by 19F magic angle spinning nuclear magnetic resonance spectroscopy

“…A similar situation also exists in the fluorapatite glassceramics where we have F-Ca(n) species in the glass and in the fluorapatite crystal phase. 20 Thus the authors propose that the local environment of fluorine in the glass reflects the fluorine structure of the crystal phase or phases that form on heat treatment.…”

“…MAS-NMR is capable of detecting the earliest stages of fluorapatite crystallisation since unlike XRD it is not sensitive to crystallite size effects. 20,33 Can 4 has, like the other canasite glasses a 19 F spectra (Fig. 5) that is similar to fluorite with a broad peak at about 108 ppm.…”

“…28 Chemical shifts were calculated from the F-cation distances for the crystalline phases found in the glass-ceramics from the literature: fluorcanasite, 29 tetrasilicic fluormica 30,31 and fluorrichterite. 32 The data for the other fluorine containing phases; fluorphlogopite, calcium fluo- [18][19][20]33 are shown on the plot in Fig. 1 and Table 3 and were used to generate the line of best fit in addition to the NMR data on binary fluoride salts.…”

A study of bioactive glass–ceramic's mechanical properties, apatite formation, and medical applications

“…6 Nonetheless, sintered porous or even dense HAp bone implants frequently fail because to mechanical properties inferior to those of real bone. Glass-ceramic systems are not one-component systems, 7 and the crystal composition differs from the parent glass. As a result, the leover glass in the glass-ceramic must be designed differently than the parent glass.…”

Bioactive fluorapatite-containing glass ceramics

“…materials with which the live bone tissue would interact, it should contain apatite phase Ca 3 (PO 4 ) 2 . This phase is part of the natural bones and provides strength and growth ability [12][13][14][15][16][17].…”