New insights on the thermodynamic barrier for nucleation in glasses: The case of lithium disilicate

Fokin, Vladimir M.; Zanotto, Edgar Dutra; Schmelzer, Jürn W. P.; Potapov, O. V.

doi:10.1016/j.jnoncrysol.2004.03.126

Cited by 37 publications

(52 citation statements)

References 21 publications

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“…Refs. [5][6][7][8][9][10][11][12][13][14][15][16]. The reported studies concern, in particular, crystalline Li 2 Si 2 O 5 compound and Li 2 Si 2 O 5 based glasses exhibiting good mechanical properties and applicable e.g.…”

Section: Introductionmentioning

confidence: 99%

Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

et al. 2010

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Structure of vanadium-doped lithium disilicate, Li2Si2O5 (Ccc2 space group) is studied. This crystalline phase is obtained by annealing of the doped lithium disilicate glass for 4 h at 550• C. X-ray diffraction and X-ray absorption near-edge structure analysis indicate location of vanadium atoms at Si sites. the lattice parameters are found to increase isotropically with increasing vanadium content. the valency of vanadium ions is discussed on the basis of X-ray absorption near-edge structure results.

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Section: Introductionmentioning

confidence: 99%

Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

et al. 2010

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“…An alternative general approach to reconcile experiment and theory can be given by employing the generalized Gibbs' approach for the determination of the work of critical cluster formation [7]. In this approach it is shown that the bulk properties of the critical clusters considerably deviate from the properties of the newly evolving macroscopic phases.…”

Section: Discussionmentioning

confidence: 99%

“…These stresses may strongly affect the kinetics of phase transitions in condensed sys-tems [1]. In more detail, the influence of internal elastic stresses on crystal nucleation and growth rates in glasses is considered from both theoretical and experimental points of view, for example, in [2][3][4][5][6][7]. A detailed overview on different investigations on the effect of elastic stresses on segregation and crystallization processes in glassforming melts is given in [8].…”

Section: Introductionmentioning

confidence: 99%

8. Stress-induced Pore Formation and Phase Selection in a Crystallizing Stretched Glass

Fokin¹,

Karamanov²,

Abyzov³

et al. 2014

Glass

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In the present chapter, we describe results of experimental investigations and theoretical analysis of phase selection and nucleation of pores in small samples of undercooled diopside liquid when it is enclosed by a solid crystalline surface layer. The formation of the surface crystalline layer starts with nucleation and growth of highly dense diopside crystals. At the moment of impingement of these crystals on the sample surface, the crystallization pathway switches from diopside to a wollastonite-like (WL) phase. The origin of such switch can be explained by the fact that the formation of the WL-crystal produces less elastic stress energy than the same amount of diopside. This difference is due to the lower (as compared to diopside) density of the WL-crystal phase, which is closer to the liquid density. The relative content of the two crystalline phases can be changed by varying the sample size. Due to the density misfit the growth of the WL-crystalline layer leads to uniform stretching of the encapsulated liquid. This negative pressure leads finally to the formation of one small pore, which rapidly grows up to a size that almost eliminates the elastic stress and, therefore, dramatically reduces the driving force for further pore nucleation. The nucleation process of the pore is experimentally found to occur in a very narrow range of the relative widths of the surface layer (compared to the sample size) and, consequently, of negative pressures. We consider this fact as an indication that pore nucleation proceeds via homogeneous nucleation. The above-given qualitative explanation of the observed phenomena is corroborated by detailed theoretical calculations of elastic stress fields and their impact on phase selection and pore nucleation. Good qualitative and partly even quantitative agreement between experiment and theory is found. An overview on other systems with similar or related properties is included as well. The findings of this research are quite general because the densities of most glasses significantly differ from those of their iso-chemical crystals. By this reason, the studied phenomena are of high technological significance for the development of different types of glass-ceramic materials and the understanding and control of sinter-crystallization processes. The latter problem is also considered in the present chapter.

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“…Fortunately, the problems with these barriers (e.g., varying G' after [18] or an anomalous increase of W* with a decreasing temperature at about T g [24]) are outside of our method for the estimation of the CCR since V m relates only to the initial reorientation stage with the ΔG # barrier which determines the boundary between glassy and crystalline states. Thus, V m is the upper theoretical limit for the CCR and in this sense V m satisfies the condition set by Vreeswijk et al [4] concerning the absence of even one critical nucleus when determining the CCR.…”

Section: Induction Period Transient Effects and Initial Reorientationmentioning

confidence: 99%

Crystallization in Glass Forming Substances: The Chemical Bond Approach

Chechetkina¹

2012

Crystallization - Science and Technology

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New insights on the thermodynamic barrier for nucleation in glasses: The case of lithium disilicate

Cited by 37 publications

References 21 publications

Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

Combined X-Ray Diffraction and Absorption Study οf Crystalline Vanadium-Doped Lithium Disilicate

8. Stress-induced Pore Formation and Phase Selection in a Crystallizing Stretched Glass

Crystallization in Glass Forming Substances: The Chemical Bond Approach

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