Raman spectroscopy study of the structure of lithium and sodium ultraphosphate glasses

Hudgens, James J.; Brow, Richard K.; Tallant, D. R.; Martin, Steve W.

doi:10.1016/s0022-3093(97)00347-5

Cited by 291 publications

(236 citation statements)

References 18 publications

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“…The decrease in the T~has been attributed to the 10SSof the filly polymerized Q3 phosphate tetrahedral network (where in the Qn nomenclature, n refers to the number of bridging oxygens (BO) per phosphorous). [10,11] The increase in the T~above x -0.2 mole fraction is consistent with some restructuring or medium range ordering (MRO) that occurs in the glass structure, including an increase of alkalinonbridging oxygen (NBO) interactions.…”

Section: Introductionmentioning

confidence: 58%

“…[9] For example, in binary alkali ultraphosphate glasses, xLizO -(1 -X)P205 (x< 0.5 mole fraction alkali), a minimum in T~is observed near the x = 0.2 M20 (M = Li, Na) modifier concentration. [10,11 ] Figure 1 shows the T~behavior for the xLi20 "(1 -X)P205 glasses as function of Li20 concentration. [10,11] Similar reductions in the T~have been noted in silicate glasses with increasing alkali content, but the "anomalous" increasing T~behavior has not been previously reported.…”

Section: Introductionmentioning

confidence: 99%

“…[10,11 ] Figure 1 shows the T~behavior for the xLi20 "(1 -X)P205 glasses as function of Li20 concentration. [10,11] Similar reductions in the T~have been noted in silicate glasses with increasing alkali content, but the "anomalous" increasing T~behavior has not been previously reported. The decrease in the T~has been attributed to the 10SSof the filly polymerized Q3 phosphate tetrahedral network (where in the Qn nomenclature, n refers to the number of bridging oxygens (BO) per phosphorous).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

6Li, 7Li nuclear magnetic resonance investigation of lithium coordination in binary phosphate glasses

Alam

Conzone

Brow

et al. 1999

Journal of Non-Crystalline Solids

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Section: Introductionmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

6Li, 7Li nuclear magnetic resonance investigation of lithium coordination in binary phosphate glasses

Alam

Conzone

Brow

et al. 1999

Journal of Non-Crystalline Solids

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“…18 The peak at 1164 cm −1 is assigned to the symmetric stretch of the two NBO, present in a P P 2 unit, the (PO 2 ) sym mode, and the 1315 cm −1 peak is assigned to the phosphorus double bonded oxygen symmetric stretching mode found only in P P 3 units, the (PO) sym mode. 18,28 3.1.2. Raman Spectra of the 0.1 ≤ x ≤ 0.2 Glasses.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…28 The peaks at 1190 and 1330 cm −1 are "strained" variants of the symmetric and asymmetric P 2 stretches, respectively. 28 These units should also be present. 31 At this x = 0.1 composition, it is assumed that the B 4 unit bridges primarily to phosphorus given the small numbers of boron atoms in the glass at x = 0.1, B:P = 1:9.…”

Section: Experimental Methodsmentioning

confidence: 99%

Structural Studies of Mixed Glass Former 0.35Na₂O + 0.65[xB₂O₃ + (1 – x)P₂O₅] Glasses by Raman and ¹¹B and ³¹P Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopies

2013

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The mixed glass former (MGF) effect (MGFE) is defined as a nonlinear and nonadditive change in the ionic conductivity with changing glass former composition at constant modifier composition. In this study, sodium borophosphate 0.35Na2O + 0.65[xB2O3 + (1 -x)P2O5], 0 ≤ x≤ 1, glasses which have been shown to exhibit a positive MGFE have been prepared and examined using Raman and 11B and 31P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopies. Through examination of the short-range order (SRO) structures found in the ternary glasses, it was determined that the minority glass former, B for 0.1 ≤ x ≤ 0.7 and P for 0.7 ≤ x ≤ 0.9, is "overmodified" and contains more Na+ ions than would be expected from simple linear mixing of the binary sodium borate, x = 1, and sodium phosphate, x = 0, glasses, respectively. Changes in the intermediate range order (IRO) structures were suggested by changes in the NMR spectral chemical shifts and Raman spectra wavenumber shifts over the full composition range x in the Raman and MAS NMR spectra. The changes observed in the chemical shifts of 31P MAS NMR spectra with x are found to be too large to be caused solely by changing sodium modification of the phosphate SRO structural groups, and this indicates that internetwork bonding between phosphorus and boron through bridging oxygens (BOs), P-O-B, must be a major contributor to the IRO structure of these glasses. While not fully developed, a firstorder thermodynamic analysis based upon the Gibbs free energies of formation of the various SRO structural units in this system has been developed and can be used to account for the preferential formation of tetrahedral boron groups, B4, by the reaction of B3 with P2 groups to form B4 and P3 groups, respectively, where the superscript denotes the number of BOs on these units, in these glasses. This preference for B4 units appears to be a predominate cause of the changing modifier to glass former ratio with composition x in these ternary MGF glasses and appears to be associated with the large negative value of the Gibbs free energy of formation of this group. Disciplines Materials Science and Engineering | Physical Chemistry CommentsReprinted with permission from The Journal of Physical Chemistry B 117 (2013) P magic angle spinning nuclear magnetic resonance (MAS NMR) spectroscopies. Through examination of the short-range order (SRO) structures found in the ternary glasses, it was determined that the minority glass former, B for 0.1 ≤ x ≤ 0.7 and P for 0.7 ≤ x ≤ 0.9, is "overmodified" and contains more Na + ions than would be expected from simple linear mixing of the binary sodium borate, x = 1, and sodium phosphate, x = 0, glasses, respectively. Changes in the intermediate range order (IRO) structures were suggested by changes in the NMR spectral chemical shifts and Raman spectra wavenumber shifts over the full composition range x in the Raman and MAS NMR spectra. The changes observed in the chemical shifts of 31 P MAS NMR spectra with x are found to be too large to be ...

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Gallium‐ and Cerium‐Doped Phosphate Glasses with Antibacterial Properties for Medical Applications

et al. 2020

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Novel cerium‐ (Ce) and gallium (Ga)‐doped phosphate glasses (PGs) are successfully obtained by the peroxidation method. The new glasses are characterized using Fourier‐transform infrared spectroscopy (FTIR), Raman spectroscopy, X‐ray diffraction, inductively coupled plasma‐optical emission spectroscopy (ICP‐OES), and pH measurements. A strong correlation between glass properties and their composition is found. The incorporation of Ga/Ce in the glass structure is confirmed by peak shifts in Raman and FTIR spectra. Degradation tests conducted in water confirm the soluble character of the PGs and reveal the influence of Ga and Ce on the degradation rate. Ga‐doped glasses are found to be less soluble than Ce‐doped ones (43%, 33%, 21%, and 16% of dry mass remained after 7 weeks for 7Ga, 5Ga, 5Ce, and 7Ce, respectively). Biological evaluation using ST‐2 cells shows adequate cell response with a cell viability of 80% measured using the indirect contact method depending on the composition. The cell viability decreases with an increase in Ga content and increases with Ce content. The antibacterial character of Ga/Ce‐doped PGs is confirmed by turbidity measurements against Escherichia coli and Staphylococcus carnosus. The novel Ce/Ga‐doped PGs exhibiting antibacterial properties and biocompatibility reported here are interesting for tissue engineering and wound healing applications.

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Raman spectroscopy study of the structure of lithium and sodium ultraphosphate glasses

Cited by 291 publications

References 18 publications

6Li, 7Li nuclear magnetic resonance investigation of lithium coordination in binary phosphate glasses

6Li, 7Li nuclear magnetic resonance investigation of lithium coordination in binary phosphate glasses

Structural Studies of Mixed Glass Former 0.35Na₂O + 0.65[xB₂O₃ + (1 – x)P₂O₅] Glasses by Raman and ¹¹B and ³¹P Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopies

Gallium‐ and Cerium‐Doped Phosphate Glasses with Antibacterial Properties for Medical Applications

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Raman spectroscopy study of the structure of lithium and sodium ultraphosphate glasses

Cited by 291 publications

References 18 publications

6Li, 7Li nuclear magnetic resonance investigation of lithium coordination in binary phosphate glasses

6Li, 7Li nuclear magnetic resonance investigation of lithium coordination in binary phosphate glasses

Structural Studies of Mixed Glass Former 0.35Na2O + 0.65[xB2O3 + (1 – x)P2O5] Glasses by Raman and 11B and 31P Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopies

Gallium‐ and Cerium‐Doped Phosphate Glasses with Antibacterial Properties for Medical Applications

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Resources

About

Structural Studies of Mixed Glass Former 0.35Na₂O + 0.65[xB₂O₃ + (1 – x)P₂O₅] Glasses by Raman and ¹¹B and ³¹P Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopies