Ultrasonic and FT-IR studies on Bi2O3–Er2O3–PbO glasses

Gaafar, M.S.; Marzouk, Samir Y.; Mady, H.A.

doi:10.1080/14786430903022663

Cited by 29 publications

(8 citation statements)

References 32 publications

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“…The behaviour of the last parameters with the decrease in PbO content is attributed to the role of the structural units MoO 4 and MoO 6 (Saddeek et al 2009a, b) confirming the increased rigidity of the glass network structure due to the replacement of PbO with lower bond strength by MoO 3 with higher bond strength (Lide 2004). This behaviour was noticed (Gaafar et al 2009) in the experimental analysis of Bi 2 O 3 -Er 2 O 3 -PbO content glasses and was attributed to the role of PbO. Moreover, the decrease in the values Poisson's ratio confirm the increased rigidity and strength of cross-link density of these glasses through the change in the type of bonds which would lead to the increase in the cross-link density (i.e.…”

Section: 1b V 2 O 5 -Li 2 O-pbo Seriessupporting

confidence: 54%

Study of rigidity of semiconducting vanadate glasses and its importance in use of coatings

Saddeek

Gaafar

2014

Bull Mater Sci

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The elastic moduli of some multicomponent vanadate based glasses were analysed in terms of the bond compression model by some physical parameters such as, the density, average stretching force constant and average atomic ring size. These parameters were calculated for all the glass series and for all the glass composition to estimate the rigidity of these glasses. The results showed that the average force constant and the elastic moduli of these glasses are sensitive to the decrease in PbO content. This behaviour was attributed to the increase in the molar volume and the role of different modifiers. These parameters along with the coordination number of the glasses affect the glass transition temperature. The correlation between the elastic moduli and thermal properties of these samples showed that 0⋅25MoO 3-0.25PbO-0⋅5V 2 O 5 glass is the most rigid and has an applicable glass transition temperature for coating.

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Section: 1b V 2 O 5 -Li 2 O-pbo Seriessupporting

confidence: 54%

Study of rigidity of semiconducting vanadate glasses and its importance in use of coatings

Saddeek

Gaafar

2014

Bull Mater Sci

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“…It is affected by structural softening/compactness, change in geometrical configuration, coordination number, crosslink density and dimension of interstitial spaces of the glass [61]. The observed behaviour in the density and molar volume of (Table 1); this irregular increase in molar volume along with the decrease in the density values above 0.06 mol% of Cr 2 O 3 suggests that chromium ions are no longer filling the interstices of the glass network indicating the formation of Cr-O-Cr linkages.…”

Section: Discussionmentioning

confidence: 99%

Vibrational spectral analysis of structural modifications of Cr2O3 containing oxyfluoroborate glasses

Sudhakar¹,

Chand²,

Prasanna³

et al. 2010

Journal of Non-Crystalline Solids

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“…Hence, the density is a tool in revealing the degree of change in the structure with any glass composition. 11 The increase in density for the glass system reveals the change in the structure of the glass with replacement of alkaline earth content. The density of a glass is found to be very sensitive to the ionic size and atomic weight.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic characterization of manganese-doped alkaline earth lead zinc phosphate glasses

Sastry

Rao

2015

Bull Mater Sci

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Alkaline earth lead zinc phosphate glasses doped with Mn(II) are characterized by spectroscopic techniques like X-ray diffraction (XRD), UV-visible, differential scanning calorimetry (DSC), electron paramagnetic resonance (EPR), Fourier transform infrared (FTIR) and Raman. Optical absorption spectrum exhibits four bands which are characteristic of Mn(II) in distorted octahedral site symmetry. The crystal field parameter Dq and Racah interelectronic-repulsion parameters B and C have been evaluated. All investigated samples exhibit EPR signals which are characteristic to the Mn 2+ ions. The shapes of spectra are also changed with varying alkaline earth ions content. FTIR spectra show specific vibrations of phosphate units. The characteristic Raman bands of these glasses due to stretching and bending vibrations were identified and analysed by varying alkaline earth content. The intensity and frequency variations for the characteristic phosphate group vibrations have been correlated with the changes of the structural units present in these glasses. Depolymerization of the phosphate chains in all the glasses is observed with replacement of alkaline earth content by spectroscopic studies. This leads to a strong decrease of the average chain length and a small decrease of the average P-O-P bridging angle with replacement of alkaline earth content.

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Ultrasonic and FT-IR studies on Bi₂O₃–Er₂O₃–PbO glasses

Cited by 29 publications

References 32 publications

Study of rigidity of semiconducting vanadate glasses and its importance in use of coatings

Study of rigidity of semiconducting vanadate glasses and its importance in use of coatings

Vibrational spectral analysis of structural modifications of Cr2O3 containing oxyfluoroborate glasses

Spectroscopic characterization of manganese-doped alkaline earth lead zinc phosphate glasses

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