Nonequilibrium crystallization of alloys in the naphthalene-dibenzyl system

Александров, В. Д.; Pokyntelytsia, O. A.; Shchebetovskaya, N. V.

doi:10.1134/s0036024414080032

Russ. J. Phys. Chem.

2014

DOI: 10.1134/s0036024414080032

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Nonequilibrium crystallization of alloys in the naphthalene-dibenzyl system

В. Д. Александров

O. A. Pokyntelytsia

N. V. Shchebetovskaya

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Cited by 2 publications

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“…Ранее методами термического анализа нами были исследованы процессы плавления и кристаллизации различных углеводородов и их смесей [2][3][4][5]. Было обнаружено, что в зависимости от термической предыстории расплава происходит резкий переход от квазиравновесной кристаллизации (КРК) без переохлаждения к неравновесновзрывной (НРВК) со значительными переохлаждениями.…”

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Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Покинтелица,

Щебетовская

2023

bulchmedenu

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Terphenyl mixtures in the crystalline state are used as scintillators, phosphors, photoresistors, sensitizers, etc. Their structure and properties largely depend on crystallization conditions. The features of crystallization of the eutectic composition of hydrocarbons o-terphenyl (79.5 wt.%) and naphthalene (20.5 wt.%) were studied by the method of cyclic thermal analysis. As a result of experiments carried out on the eutectic alloy, it was found that the horizontal plateaus recorded during heating correspond to the melting temperature (304 K) of the eutectic alloy. It has been established that weakly heated melts crystallize isothermally at a temperature ТS=298 K, which lies below the melting temperature of the eutectic ТL=304 K. about their crystallization. With an increase in the time of isothermal holding of a metastable melt, or the time the melt stays (without holding) in a overcooled state, the length of the melting plateau in the subsequent cycle increases, which indicates an increase in the degree of crystallinity of the sample. A method is proposed for determining the degree of crystallinity η from the duration te of isothermal holding of the overcooled melt and the duration τL of melting. By this method, the bulk crystallization rate constant Z and the Avrami parameter n were calculated.

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unclassified

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Покинтелица,

Щебетовская

2023

bulchmedenu

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Heat Storage Materials Based on Binuclear Aromatic Hydrocarbons

Грицук¹,

Грицук²,

Амерханова³

et al. 2015

Alternative Energy Sources in the Transport-Technological Complex: Problems and Prospects of Rational Use Of

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By cyclic and differential thermal analysis were studied conditions that reduce melt overcooling in a number of aromatic hydrocarbons such as diphenyl, diphenylethane, diphenylmethane, diphenylbenzols, naphthalene, and their mixtures. Based on experimental outcomes some practical conclusions were made for effective application of that substances as heat-accumulating materials. First of all, the thermal cycle, including melting and crystallization, is reasonable to carry outwith soft heating near the melting point for specified hydrocarbons. Secondly, it was concluded from the phase diagram analysis of hydrocarbon mixtures, that more effective will be using of alloys of eutectic composition (without thermal cycling limitation).

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Nonequilibrium crystallization of alloys in the naphthalene-dibenzyl system

Cited by 2 publications

References 2 publications

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Features of crystallization of the eutectic composition 20.5 wt.% naphthalene-79.5 wt.% o-terphenyl

Heat Storage Materials Based on Binuclear Aromatic Hydrocarbons

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