Multicritical point involving hexatic smectic phases

W. Pyżuk; E. Górecka; J. Szydłowska; A. Krówczyński; D. Pociecha; J. Przedmojski

doi:10.1103/PhysRevE.52.1748

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Multicritical point involving hexatic smectic phases

W. Pyżuk, E. Górecka, J. Szydłowska, A. Krówczyński, and D. Pociecha

J. Przedmojski

Laboratory of Dielectric and Magnetics, Department of Chemistry, Warsaw University, Al. Żwirki i Wigury 101, 02-089 Warsaw, Poland

Department of Physics, Warsaw Technical University, ul. Koszykowa 75, 00-662 Warsaw, Poland

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Phys. Rev. E 52, 1748 – Published 1 August, 1995

DOI: https://doi.org/10.1103/PhysRevE.52.1748

Abstract

The triple point smectic-C–smectic-F–hexatic-B (C-F-B) has been found in binary mixtures of THl-n (thienyl-enaminoketone derivatives) compounds with different length of molecular terminal chains n. Differential scanning calorimetry (DSC), x-ray scattering, and optical studies show that this point is a multicritical point, where two continuous phase transition lines, Sm-F–Hex-B and Sm-C–Hex-B, meet. The topology of the phase diagram is different from that for the nematic–Sm-A–Sm-C (N-A-C) multicritical point. On the Sm-F–Hex-B line a tricritical point was observed for the system close to the Sm-F–Hex-B–Cry-B triple point. For mixtures of THl-n with some reference hexatic-B compounds, a phase diagram on which the Hex-B–Sm-C phase transition line extends between Sm-C–Sm-F–Hex-B and Sm-A–Sm-C–Hex-B multicritical points was found.

References (22)

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THI-n stands for 1-(4-alkoxyphenylamino)-3-[5"-(2"-methyl-thienyl)]- 1-propen-3-one, MPR-n stands for 1-(4'-alkoxyphenylamino)- [3-(3"-pyridyl)]-1-propen-3-one, n denotes number of carbon atoms in alkoxy chain.
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[c1] J. Chen and T. C. Lubensky, Phys. Rev. A 14, 1202 (1976).

[c2] D. Johnson, D. Allender, R. de Hoff, C. Maze, E. Oppenheim and R. Reynolds, Phys. Rev. B 16, 470 (1977).

[c3] R. Bruinsma and D. Nelson, Phys. Rev. B 23, 402 (1981).

[c4] D. L. Johnson, J. Chim. Phys. 80, 45 (1983).

[c5] A. Aharony, R. J. Birgenau, J. D. Brock and J. D. Litster, Phys. Rev. Lett. 57, 1012 (1986).

[c6] D. Brisbin, D. L. Johnson, H. Fellner and M. E. Neubert, Phys. Rev. Lett. 50, 178 (1983).

[c7] R. Shadhidar, B. R. Ratna and S. Krishna Prasad, Phys. Rev. Lett. 53, 2141 (1984).

[c8] L. J. Martinez-Miranda, A. R. Kortan and R. J. Birgenau, Phys. Rev. Lett. 56, 2264 (1986); Phys. Rev. A 36, 2372 (1987).

[c9] S. C. Parmar, N. A. Clark, D. M. Walba and M. D. Ward, Phys. Rev. Lett. 62, 2136 (1989).

[c10] J. Zubiz, M. Castro, J. A. Puertolas, J. Extebarria, M. A. Perez Jubindo, and M. P. de la Fuentes, Phys. Rev. E 48, 1970 (1993).

[c11] S. R. Renn and T. C. Lubensky, Mol. Cryst. Liq. Cryst. 209, 349 (1991).

[c12] J. D. Brock, R. J. Birgenau, J. D. Litster and A. Aharony, Contemp. Phys. 30, 321 (1989).

[c13] C. C. Huang and T. Stoebe, Adv. Phys. 42, 3433 (1993).

[c14] V. N. Raja, D. S. Shankar Rao and S. Krishna Prasad, Phys. Rev. A 46, R726 (1992).

[c15] T. Pitchford, G. Nounesis, S. Dumrongrattana, J. Viener, C. C. Huang, and J. W. Goodby, Phys. Rev. A 32, 1938 (1985).

[c16] Geetha G. Nair, V. N. Raja, S. Krishna Prasad, S. Chandrasekhar, and B. K. Sadashiva, in Proceedings of the XIII AIRAPT International Conference on High Pressure Science and Technology, edited by A. K. Singh (IBH, Oxford, 1991).

[c17] THI-n stands for 1-(4-alkoxyphenylamino)-3-[5"-(2"-methyl-thienyl)]- 1-propen-3-one, MPR-n stands for 1-(4'-alkoxyphenylamino)- [3-(3"-pyridyl)]-1-propen-3-one, n denotes number of carbon atoms in alkoxy chain.

[c18] W. Pyżuk, A. Krówczyński and E. Górecka, Mol. Cryst. Liq. Cryst. 237, 75 (1993).

[c19] R. M. Hornreich, M. Luban and S. Shtrikman, Physica A 86, 463 (1977).

[c20] M. A. Anisimov and V. P. Voronov, Mol. Cryst. Liq. Cryst. 162A, 1 (1988).

[c21] W. Pyżuk, J. Szydlowska, E. Górecka, A. Krówczyński, D. Pociecha, and J. Przedmojski (unpublished).

[c22] A. D. Defontaines and J. Prost, Phys. Rev. E 47, 1184 (1993).

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Multicritical point involving hexatic smectic phases

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References (22)

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