Conductivity and morphological studies on iron borosilicate glasses

El-Damrawi, G.; Abdelghany, A.M.; Hassan, A. K.; Faroun, B.

doi:10.1016/j.jnoncrysol.2020.120233

Cited by 10 publications

(6 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…c, d, e). Some of the well-formed crystalline phases, such as crystalline apatite (calcium phosphate crystals), are categorized as bioactive phases that are useful for the material to be used in the eld of biodental and bioactive use [19][20][21][22][23][24][25][26].…”

Section: Microhardnessmentioning

confidence: 99%

“…It was found that the density of glass samples increases with increasing Nd 2 O 3 concentration as shown in gure 6. This is due to the higher molecular weight of Nd 2 O 3 (336.4822 g/mol) than the host structures of the glass samples (B 2 O 3 is 69.6202 g/mol) [19][20][21][22]. Therefore, the molar volume (M v ) shows a reverse behavior to density as shown in gure 6.…”

Section: Density Molar Volume Free Volume and Packing Densitymentioning

confidence: 99%

See 1 more Smart Citation

Structural role of Nd2O3 as a dopant material in modified borate glasses and glass ceramics

Shaalan

El-Damrawi

Hassan

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

Glasses in the system xNd 2 O 3 -(46-x)B 2 O 3 -27CaO-24.4Na 2 O-2.6 P 2 O 5 (0 ≤ x ≤ 4 mol%) have been prepared via conventional melt quenching technique. X-ray diffraction (XRD) spectra have showed that the amorphous structure is dominant in glasses of Nd 2 O 3 concentrations ≤ 0.5 mol%. But formation of a more ordered structure is con rmed at higher Nd 2 O 3 values. Result based on differential scanning calorimetry (DSC) shows an increase in glass transition temperature (T g ) with increasing Nd 2 O 3 at expense of B 2 O 3 contents. Vicker hardness (H v ) and density (D) are used to correlate the glass structure with its properties. The measured density is found to be increased whereas the molar volume is decreased with increasing Nd 2 O 3 content. The calculated molar volume (V m ) and free spaces (V f ) are both decreased due to lling process which is suggested to be carried out by Nd 3+ of larger size than that of B 3+ . Decreasing of V m and V f can re ect the increase in bridging bonds in the glass network which in turns results in increasing of both T g and of the investigated compositions.

show abstract

Section: Microhardnessmentioning

confidence: 99%

Section: Density Molar Volume Free Volume and Packing Densitymentioning

confidence: 99%

Structural role of Nd2O3 as a dopant material in modified borate glasses and glass ceramics

Shaalan

El-Damrawi

Hassan

et al. 2021

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

show abstract

“…3+ means V 3+δ , not V 3+2δ as in Eqs. (1,2). At these stages, covalent bonds were taken in the form of harmonic potentials with the spring constant of 10- 30 eVÅ -2 and the corresponding equilibrium distance.…”

Section: Simulation Detailsmentioning

confidence: 99%

“…Oxide semiconducting glasses possess electron conductivity due to the electron transfer between ions of transition metals (V 4+ /V 5+ , Fe 2+ /Fe 3+ , Pb 2+ /Pb 4+ , etc.) [1][2][3]. Such glasses attract scientific attention because of the combination of electron conductivity and features of the vitreous state: glasses can be given any shape, and their composition can be varied in a wide range of concentrations, achieving the required properties.…”

Section: Introductionmentioning

confidence: 99%

Structural changes in V₂O₅-P₂O₅ glasses: non-constant force field molecular dynamics and IR spectroscopy

2021

View full text Add to dashboard Cite

Quasi-binary phosphate-vanadate glasses have been studied by both IR spectroscopy and a novel method of molecular dynamics with a non-constant force field. This method is used for the self-assembly of structural models of glasses. The obtained models and the glass network structure are analyzed quantitatively using element distribution by the number of R–O–R bonds (R is phosphorous or vanadium) and 4-, 6-, and 8-membered cycles. The bends on the concentration dependences of atoms distribution in the second coordination sphere agree well with changing the shape of IR spectra. Based on the cycle analysis, the formation of cycles is shown to be more characteristic for vanadate fragments that can form 4-membered cycles, which, according to Zachariasen’s rule, negatively affects glass-forming ability.

show abstract

“…This interpretation may account on the presence of several diffraction lines in spectra of glasses modi ed by more than 0.5 mol% Nd 2 O 3 (spectra c, d, e). Some of the well-formed crystalline phases, such as crystalline apatite (calcium phosphate crystals), are categorized as bioactive phases that are useful for the material to be used in the eld of biodental and bioactive use[19][20][21][22][23][24][25][26].…”

mentioning

confidence: 99%

Structural Role of Nd2O3 as Dopant Material in Modified Borate Glasses and Glass Ceramics

Shaalan

El-Damrawi

Hassan

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Glasses in the system xNd2O3-(46-x)B2O3-27CaO-24.4Na2O-2.6 P2O5 (0 ≤ x ≤ 4 mol%) have been prepared via conventional melt quenching technique. X-ray diffraction (XRD) spectra have showed that the amorphous structure is dominant in glasses of Nd2O3 concentrations ≤ 0.5 mol%. But formation of a more ordered structure is confirmed at higher Nd2O3 values. Result based on differential scanning calorimetry (DSC) shows an increase in glass transition temperature (Tg) with increasing Nd2O3 at expense of B2O3 contents. Vicker hardness (Hv) and density (D) are used to correlate the glass structure with its properties. The measured density is found to be increased whereas the molar volume is decreased with increasing Nd2O3 content. The calculated molar volume (Vm) and free spaces (Vf) are both decreased due to filling process which is suggested to be carried out by Nd3+ of larger size than that of B3+. Decreasing of Vm and Vf can reflect the increase in bridging bonds in the glass network which in turns results in increasing of both Tg and of the investigated compositions.

show abstract

Conductivity and morphological studies on iron borosilicate glasses

Cited by 10 publications

References 16 publications

Structural role of Nd2O3 as a dopant material in modified borate glasses and glass ceramics

Structural role of Nd2O3 as a dopant material in modified borate glasses and glass ceramics

Structural changes in V₂O₅-P₂O₅ glasses: non-constant force field molecular dynamics and IR spectroscopy

Structural Role of Nd2O3 as Dopant Material in Modified Borate Glasses and Glass Ceramics

Contact Info

Product

Resources

About

Conductivity and morphological studies on iron borosilicate glasses

Cited by 10 publications

References 16 publications

Structural role of Nd2O3 as a dopant material in modified borate glasses and glass ceramics

Structural role of Nd2O3 as a dopant material in modified borate glasses and glass ceramics

Structural changes in V2O5-P2O5 glasses: non-constant force field molecular dynamics and IR spectroscopy

Structural Role of Nd2O3 as Dopant Material in Modified Borate Glasses and Glass Ceramics

Contact Info

Product

Resources

About

Structural changes in V₂O₅-P₂O₅ glasses: non-constant force field molecular dynamics and IR spectroscopy