强电场对可重入向列到单晶相变的影响

G. Basappa, A. S. Covind, N. V. Madhusudana
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引用次数: 8

摘要

本文报道了强电场对二元混合物中向列-近向列(N-A - d)和重入向列(a - d -N - R)相变影响的实验研究。两者的转变温度均随电场增大而增大。A -N跃迁点的变化要比A - d -N跃迁点的变化快得多,这表明在足够高的场下,A - d相会有界。我们在高极性化合物的重入相分子模型中考虑了电场的影响,在重入相中,随着温度的降低,邻近分子的相互取向从反平行变为平行。认为交叉温度随场增大而增大,这解释了观测到的趋势。在适当的参数下,还预测了向列-向列过渡线可以从a -N - R线分支出来,或者在适当的场处,a - a -s - a过渡线可以满足a -N - R线。后一种情况下,A d -N R线有相应的斜率变化,这与实验数据一致。
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Effect of a Strong Electric Field on the Reentrant Nematic to Smectic Ad Phase Transition
We report experimental studies on the effect of a strong electric field on the nematic-smectic A d (N-A d ) and A -reentrant nematic (A d -N R ) phase transitions in a binary mixture. Both the transition temperatures increase with field. The A -N transition point changes much more rapidly than that of A d -N transition, indicating that the A d phase will get bounded at a sufficiently high field. We have included the effect of the electric field in our molecular model of reentrant phases in highly polar compounds, in which the mutual orientation of near neighbour molecules changes from an antiparallel to a parallel configuration as the temperature is lowered. It is argued that the cross-over temperature increases with field which accounts for the observed trends. For suitable parameters, it is also predicted that either a nematic-nematic transition line can branch off from the A d -N R line or a smectic A-smectic A transition line can meet the A d -N R line at an appropriate field. In the latter case, the A d -N R line has an associated slope change which is consistent with the experimental data.
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