Phase Boundaries between Chiral Smectic C_α, C_β and C Phases in an Antiferroelectric Liquid Crystal, MHPOBC
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概要
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The complex dielectric constant ε^* of 4-(1-methylheptyloxycarbonyl) phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC) was measured as a function of temperature, optical purity and DC electric field, and switching current behavior was observed as a function of temperature and optical purity. A two-step change in the real part of complex dielectric constant ε' with DC electric field and several peaks in switching current were observed in high optical purity samples, but not in low optical purity ones. The phase diagram of temperature versus optical purity was obtained from the results. The disappearance of the two-step decrease in ε' under DC electric field and the disappearance of the SmC_α^* phase were observed at the same optical purity. It is suggested that antiferroelectric liquid crystals are classified into two types of phase sequence: (a) -SmC_β^*-SmC_α^*-SmA-Iso. and (b) -SmC^*-SmA-Iso.
- 社団法人応用物理学会の論文
- 1997-09-30
著者
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Hatano Jun
Department Of Applied Physics Faculty Of Science Science University Of Tokyo
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Uehara Hiroyuki
Department Of Materials Science And Technology Faculty Of Science And Technology Science University
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Uehara Hiroyuki
Department Of Applied Biological Chemistry Faculty Of Agriculture Shizuoka University
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Hatano Jun
Department Of Materials Science And Technology Faculty Of Science And Technology Science University
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Iino Yoshinori
Nhk Science & Technical Research Laboratories
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IINO Yoshinori
Department of Materials Science and Technology, Faculty of Science and Technology, Science Universit
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Hatano Jun
Department Of Materials Science And Technology Faculty Of Science And Technology Science University
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Iino Yoshinori
Department Of Materials Science And Technology Faculty Of Science And Technology Science University
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