Studies of phase transition and molecular motion in homologous series of cholesteryl ω-monohydrofluoroalkanoates by dielectric measurements

The phase transition and molecular motion in a homologous series of cholesteryl ω-monohydrofluoroalkanoates [CHFA, C 27 H 45 OCO(CF 2 ) n CF 2 H, n =1, 3, 5, 7] were studied by dielectric measurements. Two phase transitions were found near -53 and -18°C in the n =5 crystals, but both the n =3 and n...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1984-01, Vol.23 (10), p.1300-1303
Main Authors: YANO, S, TSURUTA, T
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Dielectric loss and relaxation
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Exact sciences and technology
Physics
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Summary:The phase transition and molecular motion in a homologous series of cholesteryl ω-monohydrofluoroalkanoates [CHFA, C 27 H 45 OCO(CF 2 ) n CF 2 H, n =1, 3, 5, 7] were studied by dielectric measurements. Two phase transitions were found near -53 and -18°C in the n =5 crystals, but both the n =3 and n =7 crystals show no phase transition in the crystal state. The crystals of the esters longer than n =1 did not show the successive phase transitions which exist in the n =1 crystals. One dielectric relaxation was observed in the lower temperature range for all the crystals, and this was not associated with the phase transitions. The phase transitions and the dielectric behavior of the relaxation are reflected faithfully in the crystal structure.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.23.1300