Thermodynamic features of axial vibrational control technique for crystal growth from the melt

Avetissov, Igor; Sadovskiy, Andei; Belov, Stanislav; Khomyakov, A. V.; Rekunov, Konstantin; Kostikov, Vladimir; Sukhanova, E.A.

doi:10.1039/c2ce26202a

Cited by 11 publications

(8 citation statements)

References 12 publications

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“…This is reflected in the appearance of an additional bend of the crystallization front, where the section between the "tail" and the central part of the front is parallel to the surface of the disk (Figure 9). The introduction of axial low-frequency vibrations through the disk with sharp edges leads to the breakdown of clusters in the melt [25], improving the structural perfection of the grown crystal. The integral power of viscous dissipation was determined using the expression…”

Section: Unsteady Calculation Of Crystallization Assisted By Axial Lo...mentioning

confidence: 99%

Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt

Nefedov,

Dovnarovich,

Kostikov

et al. 2024

Crystals

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The problem of intensification of the melt crystal growth process has been analyzed using CdTe as an actual material. Numerical simulation of 100 mm diameter CdTe crystal growth using the VGF technique has been carried out. The heat–mass transfer was controlled by introducing low-frequency oscillating baffle into the melt, which is a so-called axial vibrational control (AVC) technique. The baffle configuration has been optimized to destroy solid “tails”, which were formed near the crucible walls at high cooling rates due to the low thermoconductivity and the corresponding latent heat. Analysis of CdTe homogeneity range showed that during fast crystal cooling, Te micro precipitations were formed, resulting from the decay of oversaturated Cd-rich nonstoichiometric solid solution during the Bridgman crystal growth technique. After full crystallization, a VGF-grown CdTe crystal stays inside the phase field of the high-temperature wurtzite polymorph. This makes it possible to go through the polymorph transition without Te micro-precipitating using the advantages of the VGF-specific feature of very slow cooling.

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Section: Unsteady Calculation Of Crystallization Assisted By Axial Lo...mentioning

confidence: 99%

Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt

Nefedov,

Dovnarovich,

Kostikov

et al. 2024

Crystals

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“…During crystal growth processes, the average vibrational flows are responsible for heat-mass-transfer, while P w determines structure characteristics of the melt of a complex chemical composition [17]. Numerical simulation showed that the maximum (averaged over the oscillation period) velocity of vibrational flows was inversely to R and demonstrated a non-linear increase with AVC amplitude (A).…”

Section: Avc Thermodynamic Controlmentioning

confidence: 99%

“…In ref. [17], when analyzing the crystals growth processes of chemical compounds, an 2 of 14 explanation for this effect was given. It has been established that when an AVC is introduced into a liquid through harmonic vibrations of a solid chemically inert flat cylindrical disk, which has a sharp edge on a cylindrical generatrix, such high-energy flows are generated in the region of the sharp edge that the energy of viscous dissipation of liquid layers becomes comparable to the chemical interaction energy of clusters in the melt.…”

Section: Introductionmentioning

confidence: 99%

Axial Vibration Control Technique for Crystal Growth from the Melt: Analysis of Vibrational Flows’ Behavior

Nefedov,

Dovnarovich,

Kostikov

et al. 2024

Crystals

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A problem of efficacy of crystal growth methods for crystallization from solutions or melt has been investigated. The axial vibrational control (AVC) technique was considered as a perspective method to manage both heat-mass transfer and chemical component composition of the melts in the case of crystallization of complex chemical compounds. Numerical modeling and the search for generalized dependencies made it possible to predict the AVC parameters that provide optimal heat and mass transfer modes for creating flat liquid-solid interfaces, as well as the component composition of dissociated melts of various chemical compounds—Ge, NaNO3, CdTe.

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“…The experimental observation of ultrasonically-induced birefringence is also relevant [43,44]. On the other hand, low-frequency mechanical vibrations have proven to be useful in lattice crystallization as they favour higher ordering and packing [45,46]. The process depends on vibrational amplitude and frequency and is also related to the appearance of convective flow.…”

Section: Assembly and Scission In Molecular And Supramolecular Arrangmentioning

confidence: 99%

Interplay Between Mechanochemistry and Sonochemistry

Cintas

Cravotto

Barge

et al. 2014

Topics in Current Chemistry

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Thermodynamic features of axial vibrational control technique for crystal growth from the melt

Cited by 11 publications

References 12 publications

Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt

Numerical Simulation of CdTe Crystal Growth Using the Vertical Gradient Freeze Technique Assisted by Axial Low-Frequency Oscillations of the Melt

Axial Vibration Control Technique for Crystal Growth from the Melt: Analysis of Vibrational Flows’ Behavior

Interplay Between Mechanochemistry and Sonochemistry

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