Impact of the cation field strength on physical properties and structures of alkali and alkaline-earth borosilicate glasses

Lv, Panpan; Wang, Chunting; Stevensson, Baltzar; Yang, Yuehai; Wang, Tieshan; Edén, Mattias

doi:10.1016/j.ceramint.2022.03.022

Cited by 23 publications

(48 citation statements)

References 89 publications

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“…The MME strongly manifests cation mobility/conductivity properties, nonadditive scaling of viscosity, hardness, glass transition temperature, and chemical durability. A relatively small or no deviation from linearity occurs for the density, refractive index, and elastic properties with MME [ 51 , 52 , 53 ]. In comparison with the mixed alkali effect, very little attention has been paid to the mixed alkaline earth effect.…”

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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“…For most glasses except oxynitride ones, the atomic packing density decreases as the cross-linking degree of the atomic network increases. This is because as the cross-link develops, the glass network becomes less compliant, and the atomic topology is governed more and more by the glass former-oxygen skeleton [ 34 , 35 , 36 , 37 ]. For instance,

is typical of the order of 0.45 for amorphous silica (

= 4 and

= 2.67), 0.5 for soda–lime–silica glasses (typical window glasses,

is between 2 and 3), and above 0.7 for most bulk metallic glasses.…”

Section: Discussionmentioning

confidence: 99%

Impact of the Atomic Packing Density on the Properties of Nitrogen-Rich Calcium Silicate Oxynitride Glasses

Ali

2022

Materials

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In this work, the impact of the atomic packing density/fractional glass compactness of Ca–Si–O–N glasses on glass transition and crystallization temperatures, glass density, microhardness, molar volume, and refractive index were examined. It was found that the atomic packing density increased with increasing the nitrogen content and decreased with increasing the Ca content in the glass network. Furthermore, density, glass transition and crystallization temperatures, and refractive index, increased with an increasing atomic packing density of the glass, while molar volume increased with decreasing atomic packing density values. The change in hardness with atomic packing density is less clear and suggests that the atomic packing density does not solely control the underlying deformation mechanism. There is indeed competition between densification (favored at low packing density values) and isochoric shear (at larger packing density). Despite that, the effects of nitrogen as a network former and Ca as a modifier are significantly independent. The obtained results indicate that the atomic packing density of the prepared samples linearly depends on many mechanical and optical properties, suggesting that the glass network and cross-linking are proportional to the ionic radius of the Ca and the nitrogen content, respectively.

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“…The nonlinear dependence of the glass properties, such as glass transition temperature, Young's modulus, and hardness, has recently been attempted to be explained with the formation and amount of NBO and N4 in borosilicate glasses. 48 Based on this, in the section, we will be suggesting some studies for consideration of NBO and N4 as a result of different feature interactions mentioned in this study.…”

Section: Composition-based Descriptors With Thresholdsmentioning

confidence: 92%

“…19,47 This is also used for the explanation of the boron's suppressing effect toward nepheline formation. 48 Furthermore, these structural parameters can express the effect of cation type and size. In other words, as it was not trivial to observe the local environment and network character in these complex glasses, we use these structural parameters hypothesizing that they may encompass and indirectly provide statistical insight.…”

Section: Methodsmentioning

confidence: 99%

“…We have involved the structural parameters because it is known that the nature of the glass network is a determining factor for nepheline tendency 19,47 . This is also used for the explanation of the boron's suppressing effect toward nepheline formation 48 . Furthermore, these structural parameters can express the effect of cation type and size.…”

Section: Methodsmentioning

confidence: 99%

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Multivariate analysis: An essential for studying complex glasses

2022

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Understanding the impact of individual compositional components on the devitrification of complex multicomponent glasses, for example, 10-50+ oxides, typically requires numerous studies to examine each component's impact. Here we apply exploratory data analysis (EDA) to a heterogeneous data set of silicate glasses to determine the cations' individual and interacting effects on the crystallization of nepheline (nominally NaAlSiO 4 ). Our data consisted of 795 simulated high-level nuclear waste glasses composed of, on average, 50 oxide components.We determine the interactions in the heterogeneous data that cause deviations from the behavior found in simplified composition studies. Using both univariate and bivariate EDA techniques, we demonstrate the importance of including calculated structural glass parameters on nepheline's devitrification, including field strength, cation-to-anion radius ratio, and single-bond strength. We also show that studies with simplified glass compositions may fall short in generating knowledge directly transferrable to complex glass compositions. The method used in this study has the potential to inform experimental design for simplified compositions (∼6+ oxides) that can generate knowledge directly transferrable to complex, multivariable compositions. The observations reported here have broad implications for any study attempting to map the physical properties of a complex glass containing numerous cations.

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Impact of the cation field strength on physical properties and structures of alkali and alkaline-earth borosilicate glasses

Cited by 23 publications

References 89 publications

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Impact of the Atomic Packing Density on the Properties of Nitrogen-Rich Calcium Silicate Oxynitride Glasses

Multivariate analysis: An essential for studying complex glasses

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