Birefringence study of the nematic‐smectic a phase transition ofN-(4-n-pentyloxybenzylidene)-4-n-alkylaniline (50.m)
- 1 January 1987
- journal article
- research article
- Published by Taylor & Francis in Phase Transitions
- Vol. 9 (1) , 1-9
- https://doi.org/10.1080/01411598708241331
Abstract
The birefringence has been measured for the homologous series of N-(4-n-pentyloxybenzylidene)-4-n-alkylaniline (50.m) where m = 4 ∼ 8. An odd-even alternation of jumps in the birefringence at the nematic-smectic A transition temperatures is exhibited for the homologous series. The nematic-smectic A transitions are confirmed from the jumps to be of first-, second-, first-, very weakly first-, first-order, in going from 50.4 to 50.8. The transition order of these compounds is discussed in terms of the critical exponent of a Landau mean-field model.Keywords
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