Real time neutron diffraction and solid state NMR of high strength apatite–mullite glass ceramic

O’Donnell, Matthew; Karpukhina, Natalia; Calver, Adam; Law, Robert V.; Bubb, N. L.; Stamboulis, Artemis; Hill, Robert G.

doi:10.1016/j.jnoncrysol.2010.08.038

Cited by 11 publications

(8 citation statements)

References 33 publications

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“…2b shows that this phase appears with lower intensities in G, GZ and GS at 870°C. Although the present authors were not able to detect a liquid-liquid phase separation, crystallization of the fluorapatite as the first crystalline phase in the P +5 and Ca 2+ rich areas of a liquidliquid phase separated glass, has been reported previously for the same glass system [4][5][6]. Comparing Figs.…”

Section: Methodssupporting

confidence: 56%

“…It is said that using P 2 O 5 in the glass SiO 2 -Al 2 O 3 -CaO-CaF 2 system leads to the crystallization of fluorapatite and mullite phases [4][5][6][7][8][9]. It is also shown that a liquid-liquid phase separation takes place prior to crystallization [4][5][6][7][8][9]. Phase separation leads to droplet-like areas, which are rich in calcium and phosphorous ions.…”

Section: Introductionmentioning

confidence: 99%

“…The latter phase plays a key role in biocompatible glass-ceramics since they are mostly planned to use in the stress bearing areas [2]. Despite of various studies that were performed on the chemical resistance, flexural strength, biocompatibility and phase separation of the apatitemullite glass-ceramics [4][5][6][7][8][9][10], to our knowledge there are few documents about the performance of minor glass ingredients in points of crystallization behavior and mechanical properties views. The primary purpose of the present study was to gain more insight to the effect of some components like TiO 2 , ZrO 2 , and BaO and also additional amount of silica in the mentioned regards.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The role of TiO2, ZrO2, BaO and SiO2 on the mechanical properties and crystallization behavior of fluorapatite–mullite glass–ceramics

Mollazadeh

Yekta

Javadpour

et al. 2013

Journal of Non-Crystalline Solids

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Section: Methodssupporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The role of TiO2, ZrO2, BaO and SiO2 on the mechanical properties and crystallization behavior of fluorapatite–mullite glass–ceramics

Mollazadeh

Yekta

Javadpour

et al. 2013

Journal of Non-Crystalline Solids

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“…The 100% zinc substituted glass was not possible to form as it crystallised rapidly, suggesting that most likely zinc disrupted the glass network leading to phase separation. The endothermic transition at around 1200°C was thought to be due to crystal dissolution which increased with increasing zinc substitution [24].…”

Section: Discussionmentioning

confidence: 99%

Effect of zinc substitution for calcium on the crystallisation of calcium fluoro-alumino-silicate glasses

Zhang

Stamboulis

2016

Journal of Non-Crystalline Solids

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A series of 25, 60, 75 and 100 mol% zinc substituted for calcium ionomer glasses of the composition 4.5SiO 2 -3Al 2 O 3 -1.5P 2 O 5 -3CaO-2CaF 2 were produced following a well-established melt quench route. Similar glass compositions have been widely used in dentistry as the glass component in glass ionomer cements. The glasses crystallise to an apatite and mullite phase after appropriate heat treatments and are interesting materials for bone repair. Zinc is a bactericidal agent and has shown ability to stimulate osteogenesis. The new zinc containing glass compositions were characterised by Helium Pycnometer, DSC, TGA, SEM and EDX. The density of the zinc substituted glasses and glass-ceramics increased with increasing the zinc content as expected. The glass transition temperature decreased with zinc substitution, whereas the crystallisation temperature increased with zinc substitution. Zinc substituted glasses lead to the formation of gahnite in expense of mullite. Fluorapatite formation was not favoured in high zinc content glass ceramics, whereas loss of fluorine in the form of SiF 4 was suggested. SEM and EDX analysis showed significant changes in the morphology of glass ceramics with zinc substitution. The formation of gahnite during glass crystallisation may open new application avenues for these materials in the field of semiconducting materials.

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“…Relatively recently, Stamboulis et al (2006), Hill et al (2007), and O'Donnell et al (2010) conducted real-time SANS and neutron diffraction (ND) experiments on the A-M systems developed in the early 1990s. They postulated that amorphous glasses that form the A-M system may have undergone phase separation by spinodal decomposition during the casting process on a scale of 25-27 nm (Hill et al, 2007).…”

mentioning

confidence: 99%

Apatite Glass-Ceramics: A Review

2017

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This article is a review of the published literature on apatite glass-ceramics (GCs). Topics covered include crystallization mechanisms of the various families of apatite GCs and an update on research and development on apatite GCs for applications in orthopedics, dentistry, optoelectronics, and nuclear waste management. Most apatite GCs crystallize through a homogenous nucleation and crystallization mechanism, which is aided by a prior liquid-liquid phase separation. Careful control of the base glass composition and heat-treatment conditions, which determine the nature and morphology of the crystal phases in the GC can produce GC materials with exceptional thermal, mechanical, optical, and biological properties. The GCs reviewed for orthopedic applications exhibit suitable mechanical properties and can chemically bond to bone and stimulate its regeneration. The most commercially successful apatite GCs are those developed for dental veneering. These materials exhibit excellent translucency and clinical esthetics and mimic the natural tooth mineral. Due to the ease of solid solution of the apatite lattice, rare earth doped apatite GCs are discussed for potential applications in optoelectronics and nuclear waste management. One of the drawbacks of the commercial apatite GCs used in orthopedics is the lack of resorbability; therefore, the review provides a direction for future research in the field.

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Real time neutron diffraction and solid state NMR of high strength apatite–mullite glass ceramic

Cited by 11 publications

References 33 publications

The role of TiO2, ZrO2, BaO and SiO2 on the mechanical properties and crystallization behavior of fluorapatite–mullite glass–ceramics

The role of TiO2, ZrO2, BaO and SiO2 on the mechanical properties and crystallization behavior of fluorapatite–mullite glass–ceramics

Effect of zinc substitution for calcium on the crystallisation of calcium fluoro-alumino-silicate glasses

Apatite Glass-Ceramics: A Review

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