Mechanical and thermal properties of TeO2–Bi2O3–V2O5–Na2O–TiO2 glass system

Elkhoshkhany, N.; El-Mallawany, R.; Syala, Eslam

doi:10.1016/j.ceramint.2016.09.086

Cited by 73 publications

(13 citation statements)

References 34 publications

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“…In the Supporting Information, we discuss the assumptions (based on structural data) used to calculate C g with information from Refs. [18,46,49,53,66,68,76,81,86,87,90,96,97,99,110,111,122,123,125,126,128,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,145,146,147,148].…”

Section: Resultsmentioning

confidence: 99%

Revisiting the Dependence of Poisson’s Ratio on Liquid Fragility and Atomic Packing Density in Oxide Glasses

et al. 2019

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Poisson’s ratio (ν) defines a material’s propensity to laterally expand upon compression, or laterally shrink upon tension for non-auxetic materials. This fundamental metric has traditionally, in some fields, been assumed to be a material-independent constant, but it is clear that it varies with composition across glasses, ceramics, metals, and polymers. The intrinsically elastic metric has also been suggested to control a range of properties, even beyond the linear-elastic regime. Notably, metallic glasses show a striking brittle-to-ductile (BTD) transition for ν-values above ~0.32. The BTD transition has also been suggested to be valid for oxide glasses, but, unfortunately, direct prediction of Poisson’s ratio from chemical composition remains challenging. With the long-term goal to discover such high-ν oxide glasses, we here revisit whether previously proposed relationships between Poisson’s ratio and liquid fragility (m) and atomic packing density (Cg) hold for oxide glasses, since this would enable m and Cg to be used as surrogates for ν. To do so, we have performed an extensive literature review and synthesized new oxide glasses within the zinc borate and aluminoborate families that are found to exhibit high Poisson’s ratio values up to ~0.34. We are not able to unequivocally confirm the universality of the Novikov-Sokolov correlation between ν and m and that between ν and Cg for oxide glass-formers, nor for the organic, ionic, chalcogenide, halogenide, or metallic glasses. Despite significant scatter, we do, however, observe an overall increase in ν with increasing m and Cg, but it is clear that additional structural details besides m or Cg are needed to predict and understand the composition dependence of Poisson’s ratio. Finally, we also infer from literature data that, in addition to high ν, high Young’s modulus is also needed to obtain glasses with high fracture toughness.

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Section: Resultsmentioning

confidence: 99%

Revisiting the Dependence of Poisson’s Ratio on Liquid Fragility and Atomic Packing Density in Oxide Glasses

et al. 2019

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“…show some structural changes (glass former) and Ti 3+ (glass modifier) [14][15]. It is assumed that in the present glasses at lower concentration Ti 3+ ions dominate over Ti 4+ ions cause to increase the conductivity.…”

Section: Resultsmentioning

confidence: 99%

The Electrical characterization of sodium cadmium borate glasses doped with TiO2

Raheja¹,

Singh²,

Uddin³

2021

Preprint

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A glass series sodium cadmium borate glasses doped with titanium has been formed using melt quench technique within the composition 20Na2O-(20-x)CdO-60B2O3-xTiO2 (0 ≤ x ≤ 5 mol%). The composition was prepared to study the effect of dopant (TiO2) on physical, optical and electrical properties of the glass series under study. The results of physical parameter i.e. density and molar volume show some structural changes at higher concentration of TiO2 doping. Some theoretical optical parameter parameters (n, Rm, αm and ) were calculated and displayed in Table 2 & 3. The dc conductivity of the glasses is found temperature dependent. The conductivity value ranges in between 2.45x10 -6 -3.47x10 -6 Scm -1 at 523 K temperature indicates the insulating behavior of these glasses.

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“…The bond number per unit volume increased, decreased and then increased with the increase in the Er 2 O 3 concentration. The increase in the value might be due to the increase in the number of TeO 4 and BO 3 structures with decreasing number of TeO 3 and BO 2 O structures, indicating an increase in the number of bridging oxygen [31]. It can also be attributed with observed increase in cross-link density [36] as shown in Table 3.…”

Section: Bond Compression Model and Ring Deformation Modelmentioning

confidence: 85%

“…The decrease in the value maybe due to the introduction of more low dissociation energy Er 2 O 3 into the system. It may also relate to the observed increase in the molar volume of the glasses [31].…”

Section: Makashima Modelmentioning

confidence: 91%

“…The Poisson ratio is a rigidity dependent parameter, as such increase in the Poisson ratio maybe due to an increase in the rigidity of the glasses. This is due to the closure of the interstices between atoms in the glass network This allows large structural relaxation with the introduction of the sound waves, which makes the lateral strain to grow larger compared to the longitudinal strain [31]. The increase can also be attributed to the decrease in the iconicity caused by the introduction of more polar Er 3+ ions in the network [37].…”

Section: Rocherulle's Modelmentioning

confidence: 99%

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Investigations of the Elastic Moduli of Er2O3 NPs Doped TeO2 – B2O3 – SiO2 Glasses using Theoretical Models

Aliyu

Geidam

Otto

et al. 2022

J. Nig. Soc. Phys. Sci.

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Elastic moduli of {[(TeO2)0.7 (B2O3)0.3]0.8 (SiO2)0.2}1-y (Er2O3 NPs)y glasses with y = 0.01, 0.02, 0.03, 0.04, 0.05 were studied in this work using the theoretical elastic models. The Makishima & Mackenzie, Rocherulle and bond compression models were employed for the study. In the Makishima and Mackenzie model, the packing density was calculated from the bulk glass molar weight and the bulk glass density whereas in Rocherulle model it is determined as the individual oxides. Young, shear and bulk moduli as well as the Poisson ratio were calculated for the glasses in the Makishima and Rocherulle models, while longitudinal, was calculated in addition to young, bulk and shear moduli using the bond compression model. Bond per unit volume number (nb), bulk modulus, bulk modulus ratio (Kbc/Ke), atomic ring size (?) and stretching force constant were also calculated and presented. The values of the Young, bulk and shear moduli obtained from Makishima model increased from 52.854 to 55.335 GPa, 35.754 to 39.862 GPa and 21.080 to 21.809 GPa respectively with Er2O3 NPs composition increase from 1% to 5%.. The Rocherulle model presented increasing values for Young, bulk and shear moduli as 56.910 to 58.432 GPa, 41.452 to 44.450 GPa and 22.385 to 22.809 GPa respectively with Er2O3 NPs composition increase from 1% to 5%. The bond compression model presented much higher values of the elastic moduli compared to the experimentally obtained values and showed an increasing trend as the Er2O3 NPs concentration increases. In the glass network, the atomic ring size value decreased from 0.5698 to 0.5091 nm indicating an increase in the close packing of atoms. Based on the elastic moduli values presented by all the models, Makishima and Mackenzie model presented a more reliable data and hence represents the best model for the studied glass system.

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Mechanical and thermal properties of TeO2–Bi2O3–V2O5–Na2O–TiO2 glass system

Cited by 73 publications

References 34 publications

Revisiting the Dependence of Poisson’s Ratio on Liquid Fragility and Atomic Packing Density in Oxide Glasses

Revisiting the Dependence of Poisson’s Ratio on Liquid Fragility and Atomic Packing Density in Oxide Glasses

The Electrical characterization of sodium cadmium borate glasses doped with TiO2

Investigations of the Elastic Moduli of Er2O3 NPs Doped TeO2 – B2O3 – SiO2 Glasses using Theoretical Models

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