Study of elastic moduli of lithium borobismuthate glasses using ultrasonic technique

Saddeek, Yasser B.

doi:10.1016/j.jnoncrysol.2011.03.034

Cited by 22 publications

(5 citation statements)

References 38 publications

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“…A similar trend was also observed for the bulk and shear moduli of these mixed-modifier oxynitride glasses, as shown in Figure 4 c, and 4d respectively. In the case of oxynitride glasses, the bulk modulus is related to the bond density (number of bonds in a unit volume) and the bond stretching force, which are related to the cation field strength of the modifier cations [ 47 ]. Glasses in the Mg-series had higher values of both bulk and shear moduli than those in the Sr- and Ba-series.…”

Section: Resultsmentioning

confidence: 99%

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Ali

2022

Materials

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The incorporation of nitrogen as a second anion species into oxide glasses offers unique opportunities for modifying glass properties via changes in glass polymerization and structure. In this work, the compositional dependence of elastic properties and the nanoindentation hardness of mixed alkaline-earth silicate oxynitride glasses containing a high amount of nitrogen (>15 at.%, c.a. 35 e/o) were investigated. Three series of silicon oxynitride glass compositions AE–Ca–Si–O–N glasses (where AE = Mg, Sr, and Ba) having varying amounts of modifiers were prepared using a new glass synthesis route, in which a precursor powder of metal hydrides was used. The obtained glasses contained high amounts of N (19 at.%, c.a. 43 e/o) and modifier cations (26 at.%, c.a. 39 e/o). Mg–Ca–Si–O–N glasses had high values of nanohardness (12–16 GPa), along with a reduced elastic modulus (130–153 GPa) and Young’s modulus (127–146 GPa), in comparison with the Sr–Ca- and Ba–Ca-bearing oxynitride glasses. Both the elastic modulus and the nanohardness of AE–Ca–Si–O–N glasses decreased with an increase in the atomic number of the AE element. These property changes followed a linear dependence on the effective cation field strength (ECFS) of the alkaline earth (AE) modifier, according to their valences and ionic radii. No mixed alkaline-earth effect was observed in the current investigation, indicating that the properties were more dictated by the nitrogen content.

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Section: Resultsmentioning

confidence: 99%

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Ali

2022

Materials

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“…The increase in the elastic moduli is associated with an increase in the glass rigidity in the glass network as confirmed by the increased packing density and decreased molar volume of the glass system [30], [31]. The moduli of elasticity are structural configuration dependent parameters [22].…”

Section: Young Modulus Bulk Modulus Shear Modulusmentioning

confidence: 87%

“…Although the packing density depends on the glass's bulk density, the increase in the packing density observed in these glasses might not be associated with density increase. The packing density value increase with SiO2 concentration might be mostly associated with the decrease in the molar volume [22]. The molar volume decrease leads to a decrease in the interstitial spaces between atoms of the glass network.…”

Section: Makishima-mackenzie Modelmentioning

confidence: 97%

Theoretical Elastic Moduli of TeO2 – B2O3 – SiO2 Glasses

Umar

Ibrahim

2020

EJSMT

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In this work, the elastic moduli of silica based borotellurite glass system with compositional formula; [(TeO2)0.7 (B2O3)0.3]1-x (SiO2)x with x= 0.0, 0.1, 0.2, 0.3 and 0.4 was studied using theoretical models. Makishima and Mackenzie, bond compression, Rocherulle, and ring deformation models were employed in the calculation of the elastic moduli, Poisson ratio, packing density, dissociation energy, cross-link density, average stretching force constant and the glass network ring size of the studied glasses. The values of the elastic moduli obtained from the Makishima and Mackenzie model were found to be lower than those obtained from the Rocherulle model and the value from the bond compression model was reported to be highest among the three models. In all the models, the elastic moduli increased with an increase in the concentration of silica in the glass composition. Therefore, it satisfied the original intention of improving mechanical strength to achieve high Young modulus which is considered in glasses fiber drawing/ manufacturing.

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“…As the glass's physical properties are correlated to the formed bonds, it is useful to calculate the glasses' degree of ionicity (Ion). According to Pauling [50], Ion can be calculated using the relation: T 44 2 Then one can estimate: the elastic bulk modulus (K ) [51,52]:…”

mentioning

confidence: 99%

“…The propagation of both the longitudinal and shear wave velocities through a glass depends on the glass structure [51,52]. The behavior of v L and v T reflects the observed trend of the longitudinal (C 11 ), shear (C 44 ), Young (Y), and elastic bulk (K) moduli as well as the microhardness (H) and Debye's temperature (θ D ), where they have a maximum value near the stoichiometric composition as presented in table 1.…”

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confidence: 99%

Physical and mechanical properties of ternary Ge-Se-Sb glasses for near-infrared applications

et al. 2021

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Many physical properties such as the average coordination number (CN), the compactness (δ), the overall bond energy (〈E〉), the cohesive energy (CE), the mean bond energy (E s), and the overall electronegativity difference (Δχ) as well as the degrees of ionicity (Ion) and covalency (Cov) were estimated theoretically. The chemical bond approach (CBA) was used to predict the type and proportion of the formed bonds in the studied glasses. Consequently, several structural and physical properties have been estimated. The results show that the studied glasses are rigidly connected, having an average coordination number increase from 2.41 to 2.61. Two approaches have been successfully used to estimate the band gap (E g) theoretically compared with the previously published experimental values for the Ge18Se82−xSbx (5 ≤ x ≤ 25 at. %) glasses. Values of E g decrease from 1.59 to 1.15 eV by an increase of the Sb content from 5 to 25 at. %. i.e. the wavelengths corresponding to E g values lie in the near-infrared range of spectra, which make these glasses candidates for the near-infrared applications. Furthermore, the ultrasonic longitudinal (v L ) and shear wave (v T ) velocities propagating through the glasses have been used to estimate the mechanical parameters such as the elastic bulk modulus, Poisson’s ratio, Young’s modulus, micro-hardness, and temperature of Debye. It was found that a change in slope occurs for various physical, mechanical, and structural properties near the stoichiometric composition (x ≈ 18 at. %) at which the glass structure consists of heteropolar bonds only.

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Study of elastic moduli of lithium borobismuthate glasses using ultrasonic technique

Cited by 22 publications

References 38 publications

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Theoretical Elastic Moduli of TeO2 – B2O3 – SiO2 Glasses

Physical and mechanical properties of ternary Ge-Se-Sb glasses for near-infrared applications

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