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자료유형
학술대회자료
저자정보
Song, Jun-Ho (Department of Physics and Applied Physics, Korea University) Coi, Suck (Department of Physics and Applied Physics, Korea University) Kim, Yong-Bae (Department of Chemistry, Kon-Kuk University) Kumar, Satyendra (Department of Physics, Kent State University) Souk, Jun-Hyung (AMLCD, Semiconductor, SEC) Shin, Sung-Tae (Department of Physics and Applied Physics, Korea University)
저널정보
한국정보디스플레이학회 한국정보디스플레이학회 International Meeting 한국정보디스플레이학회 2002년도 International Meeting on Information Display
발행연도
2002.1
수록면
419 - 422 (4page)

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We have studied dielectric properties in the smectic phases of 4-(6-ethoxy-1-trifluoromethyl-hexyloxycarbonyl)-phenyl-4-Nonyloxybiphenyl-4-carboxylat ( TFMEOHPNBC ) having fluorine attached to one of its benzene rings. Homogeneous and homeotropic 1.5 and 5${\mu}m$ thick test cells were prepared to analyze molecular dynamic property. We measured capacitance as a function of temperature in the frequency range between 20 Hz and 100 kHz by using HP4284A LCR meter. We observed that the homogeneous cell has high dielectric constant causing dipole moment in smectic $C^{\ast}$ phase, but we can see the dipole moments are canceled out in antiferroelectric phase. It is found that there are two kind of the relaxation director fluctuation below 100 kHz. The first is ionic or space charge contribution below 10 Hz, and the second is Goldstone mode near 1-2 kHz. We will discuss molecular dynamics in smectic phase from extra information such as x-ray and electrooptic data.

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