透明電極を用いて測定したネマチック液晶MBBAの誘電特性

概要

論文の詳細を見る
To investigate the dielectric properties of the nematic liquid crystal, p-methoxybe-nzylidene-,p-n butyl-aniline (MBBA), the relative dielectric constant ε'_s and the relative dielectric loss factor ε"_s were measured at variaus frequencies by using the transparent electrodes made of In_2O_3. At intermediate frequencies between 150Hz and 100KHz, the values of ε'_s and ε"_s are nearly constant against the frequency. But these values are slightly smaller than those observed by using metal electrodes, mainly because of the large surface resistance of the transparent electrodes. At low frequencies below 150Hz, however, the values of ε'_s and ε"_s become extremely large, and large hysteresis loops are observed in the dielectric flux density D vs. the electric field E plane. Those characteristics are also depend on the thickness of the sample. It is discussed whether those large values of ε'_s, ε"_s and large areas of the hysteresis loops are resulted from the ferroelectric properties of the sample or not.
近畿大学の論文
1977-12-01