Surface crystallization of silicate glasses: nucleation sites and kinetics

Müller, Ralf; Zanotto, Edgar Dutra; Fokin, Vladimir M.

doi:10.1016/s0022-3093(00)00214-3

Cited by 231 publications

(149 citation statements)

References 42 publications

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“…Hence, the authors conclude that diopside crystallizes on the activated surface of the glass grains. Furthermore, surface nucleation and crystallization display well-known mechanisms found in the investigations on diopside glass-ceramics (Kokubo et al, 1989;Zanotto, 1991;Müller et al, 2000). In summary, the precipitation of two different silica-based crystal phases from the present glass system requires the control of two essentially different nucleation mechanisms.…”

Section: Discussionsupporting

confidence: 52%

“…From a glass-ceramic engineering point of view, the authors assumed that controlling two separate nucleation mechanisms is mandatory to precipitate both a layer silicate and a chain silicate from a base glass. Only the development of a powder compact processing facilitated the crystallization of diopside according to the nucleation and crystallization mechanisms reported by Kokubo et al (1989), Müller et al (2000), and Reinsch et al (2008) for different glass systems. The influence of the parallel precipitation of lithium disilicate and diopside on nucleation and crystallization principles as well as on properties crucial for dental applications, e.g., biaxial strength and translucency, were investigated.…”

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confidence: 99%

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Controlled Parallel Crystallization of Lithium Disilicate and Diopside Using a Combination of Internal and Surface Nucleation

et al. 2016

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In the mid-twentieth century, Dr. Donald Stookey identified the importance and usability of nucleating agents and mechanisms for the development of glass-ceramic materials. Today, a number of various internal and surface mechanisms as well as combinations thereof have been established in the production of glass-ceramic materials. In order to create new innovative material properties, the present study focuses on the precipitation of CaMgSi2O6 as a minor phase in Li2Si2O5-based glass-ceramics. In the base glass of the SiO2-Li2O-P2O5-Al2O3-K2O-MgO-CaO system, P2O5 serves as nucleating agent for the internal precipitation of Li2Si2O5 crystals, while a mechanical activation of the glass surface by means of ball milling is necessary to nucleate the minor CaMgSi2O6 crystal phase. For a successful precipitation of CaMgSi2O6, a minimum concentration of MgO and CaO in the range between 1.4 and 2.9 mol% in the base glasses was determined. The nucleation and crystallization of both crystal phases takes place during sintering a powder compact. Dependent on the quality of the sintering process, the dense Li2Si2O5-CaMgSi2O6 glass-ceramics show a mean biaxial strength of up to 392 ± 98 MPa. The microstructure of the glass-ceramics is formed by large (5-10 μm) bar-like CaMgSi2O6 crystals randomly embedded in a matrix of small (≤1 μm) plate-like Li2Si2O5 crystals arranged in an interlocking manner. While there is no significant influence of the minor CaMgSi2O6 phase on the strength of the material, the translucency of the material decreases upon precipitation of the minor phase.

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Section: Discussionsupporting

confidence: 52%

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confidence: 99%

Controlled Parallel Crystallization of Lithium Disilicate and Diopside Using a Combination of Internal and Surface Nucleation

et al. 2016

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“…Moreover, debated issues in the field are related to the temperature dependence of the transition rate characteristics at deep levels of supercooling [21][22][23][24][25][26][27][28] . So, for example, empirical T -dependencies of the nucleation lag-time and of the steady-state nucleation rate are discussed in review 25 , where results for some stoichiometric glasses (3MgO·Al 2 O 3 · 3SiO 2 , Li 2 O·2SiO 2 , Na 2 O·2CaO·3SiO 2 , et al) are given.…”

Section: Introductionmentioning

confidence: 99%

Scaling law for crystal nucleation time in glasses

Мокшин

Galimzyanov

2015

The Journal of Chemical Physics

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Due to high viscosity, glassy systems evolve slowly to the ordered state. Results of molecular dynamics simulation reveal that the structural ordering in glasses becomes observable over "experimental" (finite) time-scale for the range of phase diagram with high values of pressure. We show that the structural ordering in glasses at such conditions is initiated through the nucleation mechanism, and the mechanism spreads to the states at extremely deep levels of supercooling. We find that the scaled values of the nucleation time, τ 1 (average waiting time of the first nucleus with the critical size), in glassy systems as a function of the reduced temperature, T , are collapsed onto a single line reproducible by the power-law dependence. This scaling is supported by the simulation results for the model glassy systems for a wide range of temperatures as well as by the experimental data for the stoichiometric glasses at the temperatures near the glass transition.

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“…It must be emphasized that the usual data bases are pretty poor in mineral compounds based on Na, Si elements. Presence of crystals of cristobalite, devitrite, diopside or tridymite, as usually evidenced in high temperatures experiments on crystallization of soda-lime like glasses [18] is not completely ruled out but fits are of lower quality.…”

Section: Iiib Ex-situ Chemical Micro-analysis: Sims Studiesmentioning

confidence: 98%