Infrared and Raman spectra of Ga2O3–P2O5 glasses

Ilieva, D.; Jivov, Bojidar; Bogachev, G.G.; Petkov, Christo; Penkov, Ivan; Dimitriev, Y.

doi:10.1016/s0022-3093(01)00361-1

Cited by 108 publications

(85 citation statements)

References 27 publications

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“…31 P MAS NMR results showed an increase in linewidth interpreted as an increase in Q 1 phosphorus species whose chemical shift occurs at a more negative position due to the effect of the titanium cation. 23 Na results suggest that the addition of TiO 2 to the system does not significantly affect the average sodium environment. Like NMR, FTIR also showed that substituting Na 2 O with TiO 2 increases the strength of the phosphate chains, O/P ratio while it introduces more Q 1 units into the structure at the expense of the Q 2 units.…”

Section: Resultsmentioning

confidence: 86%

Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Neel

Chrzanowski

Valappil

et al. 2009

Journal of Non-Crystalline Solids

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a b s t r a c tThis study investigates the effect of doping a high calcium oxide containing metaphosphate glass series (CaO) 40 (Na 2 O) 10 (P 2 O 5 ) 50 with TiO 2 (1, 3, and 5 mol%). TiO 2 incorporation increased the density and glass transition temperature while reduced the degradation rate (5 mol% in particular) by twofold compared with (CaO) 30 system reported previously. This has been confirmed by ion release and the minimal pH changes. TiP 2 O 7 , NaCa(PO 3 ) 3 and CaP 2 O 6 phases were detected for all TiO 2 -containing ceramics. XPS showed that the surface is composed of Ca, P, and Ti. Ti was recognized mainly as TiO 2 , but its total amount was lower than theoretical values. 31 P magic angle spinning (MAS) NMR showed a downfield shift of the 31 P lineshape with increasing TiO 2 , interpreted as an effect of the titanium cation rather than an increase in the phosphate network connectivity. FTIR showed that incorporation of TiO 2 increased the strength of the phosphate chains, and the O/P ratio while introducing more Q 1 units into the structure at the expense of the Q 2 units. There were no differences, however, in surface topography roughness and free energies between these glasses. These results suggested that TiO 2 and CaO were acting synergistically in producing glasses with controllable bulk and structural properties.

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Section: Resultsmentioning

confidence: 86%

Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Neel

Chrzanowski

Valappil

et al. 2009

Journal of Non-Crystalline Solids

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“…The absorption bands have been assigned according to the literature. [23][24][25][26] assigned to the asymmetric stretching modes of the P-O-P linkages,  as (P-O-P), and the partially split band centred around 750 cm −1 is assigned to the symmetric stretching modes of these linkages,  s (P-O-P). The peak at 540 cm −1 is attributed to OPO deformation modes.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Preparation, structural characterisation and antibacterial properties of Ga-doped sol–gel phosphate-based glass

et al. 2009

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A sol-gel preparation of Ga-doped phosphate-based glass with potential application in antimicrobial devices has been developed. Samples of composition (CaO) 0.30 (Na 2 O) 0.20-x (Ga 2 O 3 ) x (P 2 O 5 ) 0.50 where x = 0 and 0.03 were prepared, and the structure and properties of the gallium-doped sample compared with those of the sample containing no gallium. Analysis of the 31 P MAS NMR data demonstrated that addition of gallium to the sol-gel reaction increases the connectivity of the phosphate network at the expense of hydroxyl groups. This premise is supported by the results of the elemental analysis which showed that the gallium-free sample contains significantly more hydrogen and by FTIR spectroscopy, which revealed a higher concentration of OH groups in that sample. Ga K-edge EXAFS and XANES data revealed that the gallium ions are coordinated by six oxygen atoms. In agreement with the X-ray absorption data, the high-energy XRD results also suggest that the Ga 3+ ions are octahedrally coordinated with respect to oxygen. Antimicrobial studies demonstrated that the sample containing Ga 3+ ions had significant activity againstStaphylococcus aureus compared to the control.

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“…The other noticeable change is a general broadening of the spectral features as Na 2 O is replaced by SrO. Generally, the absorption bands in the above spectra can be assigned according to the data in table 3 (Byun et al 1995;Moustafa & El-Egili 1998;Ilieva et al 2001;Shih & Shiu 2007).…”

Section: Structural Characterizationmentioning

confidence: 99%

Structure and properties of strontium-doped phosphate-based glasses

Neel

Chrzanowski

Pickup

et al. 2008

J. R. Soc. Interface.

139

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Owing to similarity in both ionic size and polarity, strontium (Sr 2C ) is known to behave in a comparable way to calcium (Ca 2C ), and its role in bone metabolism has been well documented as both anti-resorptive and bone forming. In this study, novel quaternary strontium-doped phosphate-based glasses, containing 1, 3 and 5 mol% SrO, were synthesized and characterized.31 P magic angle spinning (MAS) nuclear magnetic resonance results showed that, as the Sr 2C content is increased in the glasses, there is a slight increase in disproportionation of Q 2 phosphorus environments into Q 1 and Q 3 environments. Moreover, shortening and strengthening of the phosphorus to bridging oxygen distance occurred as obtained from FTIR. The general broadening of the spectral features with Sr 2C content is most probably due to the increased variation of the phosphate-cation bonding interactions caused by the introduction of the third cation. This increased disorder may be the cause of the increased degradation of the Sr-containing glasses relative to the Sr-free glass. As confirmed from elemental analysis, all Sr-containing glasses showed higher Na 2 O than expected and this also could be accounted for by the higher degradation of these glasses compared with Sr-free glasses. Measurements of surface free energy (SFE) showed that incorporation of strontium had no effect on SFE, and samples had relatively higher fractional polarity, which is not expected to promote high cell activity. From viability studies, however, the incorporation of Sr 2C showed better cellular response than Sr 2C -free glasses, but still lower than the positive control. This unfavourable cellular response could be due to the high degradation nature of these glasses and not due to the presence of Sr 2C .

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Infrared and Raman spectra of Ga2O3–P2O5 glasses

Cited by 108 publications

References 27 publications

Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Doping of a high calcium oxide metaphosphate glass with titanium dioxide

Preparation, structural characterisation and antibacterial properties of Ga-doped sol–gel phosphate-based glass

Structure and properties of strontium-doped phosphate-based glasses

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