Thermal properties, density and structure of percalcic and peraluminus CaO–Al2O3–SiO2 glasses

Takahashi, Shoji; Neuville, Daniel R.; Takebe, Hiromichi

doi:10.1016/j.jnoncrysol.2014.12.019

Cited by 93 publications

(73 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As already found by Takahashi, T g tends to increase with increasing [Al 2 O 3 ]/[CaO] molar ratio (ACMR). This was found also in this glass series as shown in Fig.…”

Section: Resultssupporting

confidence: 74%

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al₂O₃–SiO₂ System

Veit

Rüssel

Houet

et al. 2016

Int J of Appl Glass Sci

View full text Add to dashboard Cite

Thermal properties of ternary glass-forming systems within the known CaO-Al 2 O 3 -SiO 2 system were evaluated. Different glass compositions near the lowest eutectic composition (around a liquidus temperature of 1170°C) within the CaOAl 2 O 3 -SiO 2 system were melted from pure raw materials. The investigated target range of compositions in wt% was between 60.5 and 63.5 SiO 2 , 13.1 and 16.1 Al 2 O 3 , and 21.4 and 25.4 CaO. The chemical compositions, the glass transition temperatures, and the temperatures attributed to viscosities of 10³ dPa*s were determined experimentally. It was of special interest to obtain information of all these properties of the glasses and the effect of small composition changes hereon. The liquidus temperature changed less than expected for a composition close to the eutectic composition. Temperatures at a viscosity of 10³ dPa*s varied between 1263 and 1363°C AE 6°C. A liquidus temperature of 1157°C AE 7°C (with a confidence interval of 95%) of the eutectic composition was found. The results reported here may be useful for understanding and improvement of the modeling within the CaO-Al 2 O 3 -SiO 2 glass system.

show abstract

“…As already found by Takahashi, T g tends to increase with increasing [Al 2 O 3 ]/[CaO] molar ratio (ACMR). This was found also in this glass series as shown in Fig.…”

Section: Resultssupporting

confidence: 74%

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al₂O₃–SiO₂ System

Veit

Rüssel

Houet

et al. 2016

Int J of Appl Glass Sci

View full text Add to dashboard Cite

show abstract

“…The formation of Al 5 species results in an increased network stiffness induced by the increase in packing density . However, any depolymerization associated with the creation of additional NBOs on the borosilicate network due to the modifying Al 5 units is neglected.…”

Section: Structural Reviewmentioning

confidence: 99%

Elasticity, hardness, and fracture toughness of sodium aluminoborosilicate glasses

Januchta

Bødker

et al. 2019

J Am Ceram Soc

View full text Add to dashboard Cite

Due to an increasing demand for oxide glasses with a better mechanical performance, there is a need to improve our understanding of the composition-structuremechanical property relations in these brittle materials. At present, some properties such as Young's modulus can to a large extent be predicted based on the chemical composition, while others-in particular fracture-related properties-are typically optimized based on a trial-and-error approach. In this work, we study the mechanical properties of a series of 20 glasses in the quartenary Na 2 O-Al 2 O 3 -B 2 O 3 -SiO 2 system with fixed soda content, thus accessing different structural domains. Ultrasonic echography is used to determine the elastic moduli and Poisson's ratio, while Vickers indentation is used to determine hardness. Furthermore, the single-edge precracked beam method is used to estimate the fracture toughness (K Ic ) for some compositions of interest. The compositional evolutions of Vickers hardness and Young's modulus are in good agreement with those predicted from models based on bond constraint density and strength. Although there is a larger deviation, the overall compositional trend in K Ic can also be predicted by a model based on the strength of the bonds assumed to be involved in the fracture process. K E Y W O R D Scrack path, elastic moduli, fracture toughness, glass properties, Vickers hardness

show abstract

“…In the calcium borosilicate base glass, the origin of phase separation between network formers can be connected to the high field strength of Ca 2? ions, which has been noted to cause formation of NBOs [17,52,68,69]. This implies that Ca 2?…”

Section: Phase Separation Within Pristine Cao-b 2 O 3 -Siomentioning

confidence: 92%

Swift heavy ion-irradiated multi-phase calcium borosilicates: implications to molybdenum incorporation, microstructure, and network topology

et al. 2019

View full text Add to dashboard Cite

A series of calcium borosilicate glasses with varying [B 2 O 3 ], [MoO 3 ], and [CaO] were prepared and subjected to 92 MeV Xe ions used to simulate the damage from long-term a-decay in nuclear waste glasses. Modifications to the solubility of molybdenum, the microstructure of separated phases, and the Si-O-B network topology were investigated following five irradiation experiments that achieved doses between 5 9 10 12 and 1.8 9 10 14 Xe ions/cm 2 in order to test the hypotheses of whether irradiation would induce, propagate, or anneal phase separation. Using electron microscopy, EDS analysis, Raman spectroscopy, and XRD, irradiation was observed to increase the integration of MoO 4 2by increasing the structural disorder within and between heterogeneous amorphous phases. This occurred through Si/B-O-Si/B bond breakage and reformation of boroxyl and 3/4-membered SiO 4 rings. De-mixing of the Si-O-B network concurrently enabled cross directional Ca and Mo diffusion along defect created pathways, which were prevalent along the interface between phases. The initiation and extent of these changes was dependent primarily on the [SiO 2 ]/[B 2 O 3 ] ratio, with [MoO 3] having a secondary effect on influencing the defect population with increasing dose. Microstructurally, these changes to bonding caused a reduction in heterogeneities between amorphous phases by reducing the size and increasing the spatial distribution of immiscible droplets. This general increase in structural disorder prevented crystallization in most cases, but where precipitation was initiated by radiation, it was re-amorphized with increasing dose. These outcomes suggest that internal radiation can alter phase separation tie lines, and can therefore be used as a tool to design certain structural environments for long-term encapsulation of radioisotopes.

show abstract

Thermal properties, density and structure of percalcic and peraluminus CaO–Al2O3–SiO2 glasses

Cited by 93 publications

References 38 publications

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al₂O₃–SiO₂ System

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al₂O₃–SiO₂ System

Elasticity, hardness, and fracture toughness of sodium aluminoborosilicate glasses

Swift heavy ion-irradiated multi-phase calcium borosilicates: implications to molybdenum incorporation, microstructure, and network topology

Contact Info

Product

Resources

About

Thermal properties, density and structure of percalcic and peraluminus CaO–Al2O3–SiO2 glasses

Cited by 93 publications

References 38 publications

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al2O3–SiO2 System

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al2O3–SiO2 System

Elasticity, hardness, and fracture toughness of sodium aluminoborosilicate glasses

Swift heavy ion-irradiated multi-phase calcium borosilicates: implications to molybdenum incorporation, microstructure, and network topology

Contact Info

Product

Resources

About

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al₂O₃–SiO₂ System

Viscosity and Liquidus Temperature of Ternary Glasses Close to the Eutectic Composition in the CaO–Al₂O₃–SiO₂ System