Refractory glass–ceramics based on alkaline earth aluminosilicates

Beall, George H.

doi:10.1016/j.jeurceramsoc.2008.08.010

Cited by 66 publications

(48 citation statements)

References 13 publications

(14 reference statements)

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“…barrier of nucleation. The first appearing nanophases involve those agents (for instance, ZrO 2 , TiO 2 , TiZrO 4 ), but they do not give specific properties to the materials, as they serve as local heterogeneities for the volume crystallization of the desired crystalline phases. These latter phases will give the desired properties to the final product (low thermal expansion coefficient, high chemical, and mechanical stability .…”

Section: Introductionmentioning

confidence: 99%

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

Cormier

Cochain

Dugué

et al. 2014

Int J of Appl Glass Sci

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Selected results on the environment around Zr, Ti, and Ni in glasses and glass-ceramics using X-ray absorption spectroscopy (XAS) are presented to illustrate how this technique can provide information on the nucleation/crystallization processes. These elements actively participate to nucleation and, additionally, some of them bring new optical properties to the material. We show that extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) information, at K-edge or L 2,3 -edges, can give short and medium range structural and bonding information. Nucleation activity of transition elements cannot be concluded from their local environment within the investigated parent glasses (at least for Zr and Ti, the main nucleating agents). On the contrary, medium range organization is important to understand nucleation processes with the evidence of heterogeneities or structural fluctuations that can be directly related to the first crystallizing phases. New developments in the spatial resolution or in situ high temperature measurements show the utility of the XAS technique with environmental changes around transition elements that can be detected prior to macroscopic crystallization. This can be useful to determine whether a specific ion (e.g., Ni 2+ ) enters the crystalline phase and in which site, allowing a better control of the temperature or crystallization kinetics to optimize the material properties.

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Section: Introductionmentioning

confidence: 99%

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

Cormier

Cochain

Dugué

et al. 2014

Int J of Appl Glass Sci

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“…According to the phase diagram of the SrO, SiO 2 and Al 2 O 3 phases [17] a strontium feldspar (SrAl 2 Si 2 O 2 ) phase can be formed at temperatures above 1400°C. Both silicon and aluminum recorded from on-top EDS spectra agree with this phase as the ratio of these components are close to 1:1.…”

Section: Discussionmentioning

confidence: 99%

Strontium zirconate as silicon and aluminum scavenger in yttria stabilized zirconia

2011

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“…Due to the presence of both crystalline and residual glassy phase, glass-ceramics possess a combination of valuable properties of both glasses and ceramics [1]. Glass-ceramics have gain importance in recent years due to their remarkable dielectric, structural, mechanical [2] and biocompatible properties [3] which find application in various fields of telecommunication [4], architecture [5], and health care [6]. The physical and chemical properties of glass-ceramics mainly depend on the composition of glass, type and amount of the crystalline phase, microstructure, the heat treatment procedure and nucleating agents [7].…”

Section: Introductionmentioning

confidence: 99%

“…Glass-ceramics are also considered as intrinsic composites because during heat treatment the reinforcing phase is nucleated from the parent glass, which, therefore, provides toughness and mechanical strength to the polycrystalline solid [8]. Previously a number of studies have been made on doped glass-ceramics with * E-mail: madeehariaz2762@yahoo.com different nucleating agents, such as TiO 2 [9,10], to obtain effective crystallization and sinterability of the glass-ceramics. Naga et al [11] reported that doping of Ta 2 O 5 improved densification, hardness and toughness of pure alumina.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ta₂O₅doping on mechanical and biological properties of silicate glass-ceramics

Riaz

Zia

Saleemi³

et al. 2016

Materials Science-Poland

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The mechanical properties of silicate glass-ceramics were evaluated based on the compressive strength tests. It was found that Ta 2 O 5 addition improved densification, refinement of the microstructure and toughening of the bodies. The maximum compressive strength of the bodies with 1 mol% Ta 2 O 5 was increased 3-fold (245.92 ±0.3 MPa) in comparison to undoped glass-ceramics which was measured to be 89.04 ±0.3 MPa, while for 3 mol% it became 4-fold (387.12 ±0.4 MPa) greater. The addition of Ta 2 O 5 stabilized the system by controlling the biodegradation of the glass-ceramics. It effectively depressed the apatite formation as by addition of 3 mol% Ta 2 O 5 no apatite layer was observed. It may be concluded from this study that mechanical and physical properties can be improved by the addition of Ta 2 O 5 , but at a cost of bioactivity. Still the optimized composition having Ta 2 O 5 1 mol% may provide appropriate strength of biomaterials for high load bearing applications.

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Refractory glass–ceramics based on alkaline earth aluminosilicates

Cited by 66 publications

References 13 publications

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

Strontium zirconate as silicon and aluminum scavenger in yttria stabilized zirconia

Influence of Ta₂O₅doping on mechanical and biological properties of silicate glass-ceramics

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Refractory glass–ceramics based on alkaline earth aluminosilicates

Cited by 66 publications

References 13 publications

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

Transition Elements and Nucleation in Glasses Using X‐ray Absorption Spectroscopy

Strontium zirconate as silicon and aluminum scavenger in yttria stabilized zirconia

Influence of Ta2O5doping on mechanical and biological properties of silicate glass-ceramics

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Influence of Ta₂O₅doping on mechanical and biological properties of silicate glass-ceramics