Parameters of the Fluctuation Free Volume Theory for Glasses in the Ge–As–Se System

Мельниченко, Т. Д.; Різак, В. М.; Mel'nichenko, T. N.; Fedelesh, V. I.

doi:10.1023/b:gpac.0000045920.01447.ba

Cited by 21 publications

(34 citation statements)

References 3 publications

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“…Then, we use the data on the quantities T g , T 0 , and B taken from [6,12,[30][31][32] and obtain the estimates C ≈ 1.3 K for amorphous polymers and C ≈ 6 K for silicate Table 5. Parameters C in relationship (1) according to the calculations from formula (16) with due regard for the temperature dependence of the activation energy and the quantities f g calculated from the expression f g = (T g -T 0 )/B (the data are taken from [1]) (Table 5), which are in agreement with the aforementioned results (Tables 1-4).…”

Section: Results Of the Calculations And Discussionmentioning

confidence: 99%

Relaxation time and cooling rate of a liquid in the glass transition range

2007

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The transfer of kinetic units (atoms or groups of atoms) in amorphous materials from one quasiequilibrium position to another quasi-equilibrium position is governed by the fluctuations of both the energy and the entropy of the system. In the glass transition range of liquids, the entropy mechanism plays a dominant role: fluctuations of the particle packing appear to be more significant than the accumulation of the energy. At high temperatures above the glass transition range, the energy mechanism plays a decisive role. The physical meaning of the parameter involved in the Bartenev equation relating the relaxation time to the cooling rate at the glass transition temperature is discussed. A technique is proposed for calculating this parameter with allowance made for the temperature dependence of the activation energy in the liquid-glass transition range. A variant of the modification of this equation is considered.

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Section: Results Of the Calculations And Discussionmentioning

confidence: 99%

Relaxation time and cooling rate of a liquid in the glass transition range

2007

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“…The inset to Fig. 3 presents the coefficients A, B, and T 0 in the approximation according to the Vogel-Fulcher-Tammann equation [ 104 ]. It can be seen from Fig.…”

Section: Sample Preparation and Experimental Techniquementioning

confidence: 96%

Nucleation and Crystal Growth in Phase Separated Glasses in the Lithium Silicate System

Сычева¹

2012

Crystallization and Materials Science of Modern Artificial and Natural Crystals

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“…The vitrification temperatures T g and T 13 , and, hence, the glass viscosities increase by transferring to more silica-containing glass, but to a greater degree in glass II glass than in glass III. All-in-all, glass II is less dense and more viscous than glass III, and the activation energies of fric- …”

Section: Synthesis Of Glass and Some Of Their Characteristicsmentioning

confidence: 99%

“…Kluyev and the viscosity of the melts was measured using the method of platinum sphere drawing. The temperature dependences of viscosity were processed using the method of least squares with the help of a standard computer program for finding coefficients A, B, and T 0 in the approximation equation using the Vogel-Fulcher-Tamman method [13]:…”

Section: Equipment and Techniques Of Synthesis And Investigationsmentioning

confidence: 99%

Volume and Surface Nucleation of Crystals in Glass Based on Blast-Furnace Slag

Сычева¹

2017

JCPT

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Using differential thermal analysis, X-ray phase analysis, electron microscopy, and optical microscopy, the nucleation of crystals in glass obtained by blending metallurgical slag with silicon dioxide has been studied. The type of crystallization (homogeneous or heterogeneous, volume or surface) is revealed for each of nine compositions of synthesized glass. It is shown that the first crystalline phase in a volume crystallizing glass is perovskite (CaO·TiO 2 ); in this phase a nucleation of the main phase occurs: melilite (solid solution of gehlenite 2CaO·Al 2 O 3 ·SiO 2 in akermanite 2CaO·MgO·2SiO 2 ). The fundamental characteristics of homogeneous (for a catalizing phase, perovskite) and heterogeneous (for a catalyzed phase, melilite) of crystallization are determined: the steady state nucleation rate I st , time of unsteady state nucleation τ, crystal growth rate U, and activation energy of frictional flow. The temperature dependences of I st , τ, and U are obtained. The kinetics of the crystallization of glass is studied and the rates of the surface crystal growth are determined in the glass of nine compositions. The influence of grinding the particles of the original glass on the sequence of deposition of the crystalline phases was studied. Practical recommendations are presented for the use of blast-furnace slag as a raw material for the synthesis of glass and their further utilization.

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Parameters of the Fluctuation Free Volume Theory for Glasses in the Ge–As–Se System

Cited by 21 publications

References 3 publications

Relaxation time and cooling rate of a liquid in the glass transition range

Relaxation time and cooling rate of a liquid in the glass transition range

Nucleation and Crystal Growth in Phase Separated Glasses in the Lithium Silicate System

Volume and Surface Nucleation of Crystals in Glass Based on Blast-Furnace Slag

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