Structural study of magnesium polyphosphate glasses

Walter, G.; Vogel, J.; Hoppe, Uwe; Hartmann, Peter

doi:10.1016/s0022-3093(03)00016-4

Cited by 55 publications

(63 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In Refs. [6,20], the short and intermediate range structure of these glasses was investigated. Thus the samples discussed in this study are differently old, but basically all samples have been stored under vacuum to reduce the water incorporation.…”

Section: Resultsmentioning

confidence: 99%

“…Their amount is smaller than 1%. For a given volume fraction, w P , the number of heterogeneities, N, can be estimated from (6). The smaller the difference between w P and (1 À w P ) the larger the magnitude of ðDqÞ 2 , i.e., the stronger the scattering effect [cf.…”

Section: Resultsmentioning

confidence: 99%

“…It becomes evident that with formation of an increasing cross-linked network containing more than about 13% Q 3 units the structure becomes more homogeneous. But for the glasses around metaphosphate composition and for all glasses up to y = 1.87 a weak small angle scattering was recorded [6]. (Fig.…”

Section: Small-scale Heterogeneities In Magnesium and Zinc Phosphate mentioning

confidence: 93%

“…Preparation procedures are detailed described in Ref. [6] (sample with y = 1.49) and in Ref. [20] (samples with y = 0.87 and 1.13) where also properties and structural analyzes of the short and intermediate range structure are presented.…”

Section: Glass Preparation and Characterizationmentioning

confidence: 99%

“…For the first time, small angle X-ray scattering experiments on metaphosphate glasses were reported in 1990 [4] which have shown that small heterogeneities of electron density of about 1 nm size are present in magnesium metaphosphate glass. More recently, the presence of such heterogeneities was established in a zinc polyphosphate and a sodium-zinc pyrophosphate glass by small angle X-ray scattering [5] and in magnesium [6] and zinc polyphosphate glasses [7] with varying composition. Moreover, a pronounced scattering at smallest s values was reported to be measured with X-rays for zinc phosphate glasses [7] and with neutrons for iron phosphate glass [8].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

The structure of phosphate glass evidenced by small angle X-ray scattering

Walter

Goerigk

Rüssel

2006

Journal of Non-Crystalline Solids

Self Cite

View full text Add to dashboard Cite

Numerous phosphate glass systems with compositions covering the entire glass forming range have been examined by small angle Xray scattering. The experiments were carried out in a widely extended interval of s values between 0.055 and 31 nm À1 . A small angle scattering effect was detected for all samples investigated with the exception of the aluminium metaphosphate glass. The small angle scattering recorded indicates the presence of two differently-sized heterogeneity regions of electron density. The small-scale heterogeneities are present in magnesium and zinc phosphate glasses only. Their size is about 1 nm diameter in the magnesium and about 2 nm in the zinc phosphate glasses. The species do not result from liquid-liquid phase separation. Examinations to extract information on the nature of these heterogeneity regions are described in detail. There is no fundamental knowledge on the large-scale heterogeneities established. The small angle scattering suggests that their occurrence is related to water contamination. Anomalous small angle X-ray scattering experiments of a series of zinc polyphosphate glasses and a strontium metaphosphate glass sample are performed to examine the distribution of the Zn or Sr atoms, respectively.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Small-scale Heterogeneities In Magnesium and Zinc Phosphate mentioning

confidence: 93%

Section: Glass Preparation and Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The structure of phosphate glass evidenced by small angle X-ray scattering

Walter

Goerigk

Rüssel

2006

Journal of Non-Crystalline Solids

Self Cite

View full text Add to dashboard Cite

show abstract

Phosphate Glasses

Brauer

2012

Bio‐Glasses

View full text Add to dashboard Cite

Exploring the structure of pure germanophospate glasses with different concentrations probed by magic angle spinning NMR spectroscopy

Hussein

Rekik

Chebaane

et al. 2022

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

Phosphate‐based glasses such as pure germanophosphate can be achieved at moderately low temperature by means of affordable chemical substances. Nowadays, they become more stimulating because they can be easily doped with alkali, transition metal ions, and rare earth oxides to afford the anticipated physical and/or chemical features for nanoscience applications. Herein, we report an experimental study dealing with the structure of pure germanophosphate glass samples of GeO2 prepared with different concentrations ranging from 20 up to 70 mole%. 31P magic angle spinning (MAS) nuclear magnetic resonance (NMR) spectroscopy has been employed to characterize the co‐formed glasses by two different glass‐forming oxides. The components of the phosphate species ( normalQn) in each sample were determined by analyzing the MAS NMR spectra. Interestingly, 31P MAS NMR spectrum for each sample was found to be characteristic powder patterns of the middle units Q2. Q2 unit found herein has one oxygen atom bonded towards one germanium atom (non‐bridging) and the other two oxygens are bonding towards two phosphorus atoms (bridging) of phosphate group (PO4). The results show that Q2 split into two units, Q2I and Q2II, due to different shielding of the phosphorus nucleus provided by the next nearest neighbor atoms. The chemical shift is interpreted in terms of the structure of each building unit of the phosphate group. The results obtained herein shed light on the way how to explore the revealed structure of the prepared glasses for the development of supported catalysts. Indeed, owing to their high chemical/thermal stability, the co‐formed germanophosphate glasses obtained may prove as useful substrates for potential nanocatalysts.

show abstract

Structural study of magnesium polyphosphate glasses

Cited by 55 publications

References 32 publications

The structure of phosphate glass evidenced by small angle X-ray scattering

The structure of phosphate glass evidenced by small angle X-ray scattering

Phosphate Glasses

Exploring the structure of pure germanophospate glasses with different concentrations probed by magic angle spinning NMR spectroscopy

Contact Info

Product

Resources

About