The study of birefringence in mixed plastic methylchloromethanes

Struts, Andrey V.; Bezrukov, O. F.

doi:10.1016/0009-2614(94)01331-o

Cited by 12 publications

(16 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…If the molecular polarizability anisotropy is known [38,39], the order parameter S can be determined in one-component system and also in two-component crystals [29]. In our treatment regarding the orientationally disordered (OD) parameter (ψ) of the rhombohedral (R) phase and the orientationally ordered (OO) parameter (η) of the FCC phase of the two-component system (CH 3 CCl 3 +CCl 4 ), we considered only the amplitudes of the order parameters (ψ and η).…”

Section: Discussionmentioning

confidence: 99%

“…Both OD phases, namely, stable (rhombohedral) and metastable (face-centered cubic, FCC) phases have been studied by the measurements of optical birefringence [25], Raman [26], and Brillouin scattering [27,28]. Birefringence measurements have also been conducted for the mixed non-cubic orientationally disordered (OD) crystals of CH 3 CCl 3 +CCl 4 [29] and (CH 3 ) 2 CCl 2 +CCl 4 [30]. In particular, for the methyl chloroform-carbon tetrachloride by analyzing the concentration dependence of the birefringence the orientational order parameters of axially symmetric molecules have been calculated in this two-component plastic crystal [29].…”

Section: Introductionmentioning

confidence: 99%

“…Birefringence measurements have also been conducted for the mixed non-cubic orientationally disordered (OD) crystals of CH 3 CCl 3 +CCl 4 [29] and (CH 3 ) 2 CCl 2 +CCl 4 [30]. In particular, for the methyl chloroform-carbon tetrachloride by analyzing the concentration dependence of the birefringence the orientational order parameters of axially symmetric molecules have been calculated in this two-component plastic crystal [29]. Orientational order in this system has been studied by 1 H NMR spectroscopy [31].…”

Section: Introductionmentioning

confidence: 99%

“…They calculated the order parameters from birefringence using a phenomenological theory developed by Vuks [32]. Also, observations in polarized light indicate that mixtures of CCl 4 and methyl chloroform consist of solid solutions over all range of concentrations with the metastable cubic phase and the stable non-cubic phase [29]. When the CCl 4 monolayer is preadsorbed on graphite, there occurs a phase transition before the CCl 4 displacement in the CH 4 /CCl 4 solid solution near the melting point similar to the commensurateincommensurate transition occurring in a two-dimensional kyripton-CCl 4 solid solution [7].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Analysis of the Heat Capacity for Pure CH4 and CH4/CCl4 on Graphite Near the Melting Point and Calculation of the T–X Phase Diagram for (CH3)CCl3+CCl4

Yurtseven

Yilmaz

2016

Front. Phys.

View full text Add to dashboard Cite

We study the temperature dependence of the heat capacity C p for the pure CH 4 and the coadsorbed CH 4 /CCl 4 on graphite near the melting point. The heat capacity peaks are analyzed using the experimental data from the literature by means of the power-law formula. The critical exponents for the heat capacity are deduced below and above the melting point for CH 4 (T = m 104.8 K) and CH 4 /CCl 4 (T = m 99.2 K). Our exponent values are larger as compared with the predicted values of some theoretical models exhibiting second order transition. Our analyses indicate that the pure methane shows a nearly second order (weak discontinuity in the heat capacity peak), whereas the transition in coadsorbed CH 4 /CCl 4 is of first order (apparent discontinuity in C p ). We also study the T-X phase diagram of a two-component system of CH 3 CCl 3 +CCl 4 using the Landau phenomenological model. Phase lines of the R+L (rhombohedral + liquid) and FCC+L (face-centered cubic + liquid) are calculated using the observed T-X phase diagram of this binary mixture. Our results show that the Landau mean field theory describes the observed behavior of CH 3 CCl 3 +CCl 4 adequately. From the calculated T-X phase diagram, critical behavior of some thermodynamic quantities can be predicted at various temperatures and concentrations (CCl 4 ) for a binary mixture of CH 3 CCl 3 +CCl 4 .

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analysis of the Heat Capacity for Pure CH4 and CH4/CCl4 on Graphite Near the Melting Point and Calculation of the T–X Phase Diagram for (CH3)CCl3+CCl4

Yurtseven

Yilmaz

2016

Front. Phys.

View full text Add to dashboard Cite

show abstract

“…. , 4) show such a kind of OD phase and offer a unique opportunity to compare and analyse the steric and intermolecular interactions controlling the phase behaviour as a function of temperature and pressure [2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%