Nucleation in glass and differential thermal analysis

Marotta, A.; Buri, A.; Branda, F.

doi:10.1007/bf00738622

Cited by 233 publications

(128 citation statements)

References 8 publications

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“…4(a)), indicating that a large number of nuclei developed during the isothermal treatment period, i.e., there was a trend toward homogeneous nucleation. 23) In addition, we also observed the crystalline aggregates with diameters of about 200 nm, which is much smaller than the spherulites of the B2S3 phase (Fig. 4(b)).…”

Section: Crystallization Precursive Stagementioning

confidence: 67%

Formation of spherulite and metastable phase in stoichiometric Ba2Si3O8 glass

Takahashi

Masai

Osada

et al. 2010

J. Ceram. Soc. Japan

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We investigated the crystallization and resulting morphology of a stoichiometric barium-silicate glass Ba 2 Si 3 O 8 (B2S3) using TEM observation and Raman spectroscopy. Spherical crystal growth (i.e., spherulite) of stoichiometric B2S3 phase was observed in the heat-treated glass samples, and the size of the spherulites drastically increased as the temperature increased during the heat-treatment process. It was also found that an initial precipitating phase in the precursive stage of crystallization is neither the B2S3 phase nor other crystalline phases in the BaOSiO 2 system. It was deduced that a metastable phase precipitates prior to the formation of spherulite and acts as nucleation site for the spherulite.

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Section: Crystallization Precursive Stagementioning

confidence: 67%

Formation of spherulite and metastable phase in stoichiometric Ba2Si3O8 glass

Takahashi

Masai

Osada

et al. 2010

J. Ceram. Soc. Japan

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“…Activation energies for crystallisation, E a (T p ), were determined using the method outlined by Marrotta et al [33]. The basis of the method is shown in equation 1:…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

Bioactive glass engineered coatings for Ti6Al4V alloys: Influence of strontium substitution for calcium on sintering behaviour

Lotfibakhshaiesh

Brauer

Hill

2010

Journal of Non-Crystalline Solids

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Bioactive glass coatings with thermal expansion coefficients matched to Ti6Al4V alloys have been designed, and glasses based on the multicomponent system 49.96 SiO 2 -7.25 MgO-3.30 Na 2 O-3.30 K 2 O-3.00 ZnO-1.07 P 2 O 5 -32.62 CaO (mol%) with 0, 10, 25, 50, 75 and 100% of calcium oxide replaced by strontium oxide have been produced by a melt-quench route. Sintering behaviour has been characterised by differential scanning calorimetry, X-ray diffraction and scanning electron microscopy.Glass transition and crystallisation temperatures and their respective activation energies were determined; extrapolated onset values for these parameters have been determined in order to optimise the sintering temperature for producing amorphous coatings. Amorphous coatings have been produced which showed good adhesion to the alloy with the exception of the 100% Sr substituted coating.Substituting strontium for calcium reduced the glass transition temperature and lowered the activation energy for crystallisation whilst increasing the onset temperature of crystallisation. The mixed calcium/strontium glasses exhibit a larger processing window, which favours sintering without crystallisation occurring and obtaining amorphous well sintered coatings. However, complete substitution favours crystallisation and reduces the processing window.

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“…Optimum nucleation temperatures were determined by the Marrotta method 13) with one hour holding for nucleation. Suitable heat treatment times were determined using these nucleation temperatures and were held at various length of times (0.5, 1, 2, 4, and 10 hours).…”

Section: Glass Characterizationmentioning

confidence: 99%

“…16) was applied to describe the behavior of the non-isothermal crystallization kinetics of glass developed by Kissinger 13) as Eq. (1):…”

Section: Glass Characterizationmentioning

confidence: 99%

Machinable glass-ceramics forming as a restorative dental material

et al. 2011

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MgO, SiO2, Al2O3, MgF2, CaF2, CaCO3, SrCO3, and P2O5 were used to prepare glass-ceramics for restorative dental materials. Thermal properties, phases, microstructures and hardness were characterized by DTA, XRD, SEM and Vickers microhardness. Three-point bending strength and fracture toughness were applied by UTM according to ISO 6872: 1997(E). XRD showed that the glass crystallized at 892°C (second crystallization temperature+20°C) for 3 hrs consisted mainly of calcium-mica and fluorapatite crystalline phases. Average hardness (3.70 GPa) closely matched human enamel (3.20 GPa). The higher fracture toughness (2.04 MPa√m) combined with the hardness to give a lower brittleness index (1.81 µm −1/2 ) which indicates that they have exceptional machinability. Bending strength results (176.61 MPa) were analyzed by Weibull analysis to determine modulus value (m=17.80). Machinability of the calcium micafluorapatite glass-ceramic was demonstrated by fabricating with CAD/CAM.

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Nucleation in glass and differential thermal analysis

Cited by 233 publications

References 8 publications

Formation of spherulite and metastable phase in stoichiometric Ba2Si3O8 glass

Formation of spherulite and metastable phase in stoichiometric Ba2Si3O8 glass

Bioactive glass engineered coatings for Ti6Al4V alloys: Influence of strontium substitution for calcium on sintering behaviour

Machinable glass-ceramics forming as a restorative dental material

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