The influence of the mixed alkaline earth effect on the structure and properties of (Ca, Mg)–Si–Al–O–N glasses

Wang, Huili; Hou, Xinghui; Zhao, Dakui; Li, Si; Huang, Wenjiang; Zhou, Ying

doi:10.1016/j.ceramint.2021.01.078

Cited by 11 publications

(5 citation statements)

References 32 publications

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“…Previous numerous investigations of alkali and alkaline earth oxynitride glasses revealed the absence of a mixed modifier effect. Exceptionally, Wang et al [ 54 ] very recently showed that (Ca,Mg)–Si–Al–O–N glasses prepared using the sol–gel method had a mixed modifier effect but only for the glass transition temperature, whereas no mixed effect was observed for the reported density, molar volume, Vickers hardness, and compressive strength. Furthermore, the authors only reported the nominal composition of the glasses; thus, the concentration of N in the glass network is unclear.…”

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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“…reported that, for a given Al/B ratio, cations with higher field strength (greater charge to radius ratio) result in rising amount of NBOs and a reduce in the boron N 4 . As a consequence of CFS, mixed modifier effect (MME) becomes operational 37,38 . MME can be defined as the nonlinear variation of glass properties with gradual substitution of certain metal ions 39 .…”

Section: Introductionmentioning

confidence: 99%

“…MME can be defined as the nonlinear variation of glass properties with gradual substitution of certain metal ions 39 . These glass properties are associated with the ionic mobility of different pairs such as alkali/alkali, alkali–alkaline earth or alkaline earth/alkaline earth 38 . Wu and Stebbins 28,33 linked the rise of NBOs to the conversion of boron coordination through the structural reaction:

\begin{equation}^{\left[ 4 \right]}{\rm{B}}{ \leftrightarrow ^{[3]}}{\rm{B}} + {\rm{NBO}}\end{equation}

When there is an increase of modifier with higher CFS, this equilibrium shifts to the right to avoid formation of linkages such as [4] B–O– [4] B that are energetically less favorable.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence of CFS, mixed modifier effect (MME) becomes operational. 37,38 MME can be defined as the nonlinear variation of glass properties with gradual substitution of certain metal ions. 39 These glass properties are associated with the ionic mobility of different pairs such as alkali/alkali, alkali-alkaline earth or alkaline earth/alkaline earth.…”

Section: Introductionmentioning

confidence: 99%

“…39 These glass properties are associated with the ionic mobility of different pairs such as alkali/alkali, alkali-alkaline earth or alkaline earth/alkaline earth. 38 Wu and Stebbins 28,33 linked the rise of NBOs to the conversion of boron coordination through the structural reaction: [4] B↔ [3] B + NBO…”

Section: Introductionmentioning

confidence: 99%

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Effect of modifier cation field strength on the structures of magnesium oxide containing aluminoborosilicate glasses

Tuheen

2022

Int J of Appl Glass Sci

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Network glass structures are commonly characterized by the network formers and their linkage but modifiers can also play an important role on various features of glass structures. In this work, we investigated the effect of cation field strength (CFS) of common modifier cations with large differences of CFS on the structures of aluminoborosilicate glasses by performing molecular dynamics (MD) simulations with recently developed potentials. It was found that modifier cations with higher CFS such as Mg 2+ significantly reduced the fraction of fourfold coordinated boron, suggesting that the cations with higher field strength favor nonbridging oxygen generation in the silicate network and are less effective for charge compensation. The findings from our MD simulations are compared with the results from NMR and Raman spectroscopy studies in the literature as well as those from other MD simulations. Insights of the CFS effect on glass structures and the structural role of Mg 2+ ions are gained from these simulations results and related discussions.

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Rapidly treatment of simulated An4+ radioactive contaminated soil by microwave sintering: The influence of Al/Si ratio and mechanism

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Yuan

et al. 2023

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The influence of the mixed alkaline earth effect on the structure and properties of (Ca, Mg)–Si–Al–O–N glasses

Cited by 11 publications

References 32 publications

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Elastic Properties and Hardness of Mixed Alkaline Earth Silicate Oxynitride Glasses

Effect of modifier cation field strength on the structures of magnesium oxide containing aluminoborosilicate glasses

Rapidly treatment of simulated An4+ radioactive contaminated soil by microwave sintering: The influence of Al/Si ratio and mechanism

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