Abstract
Abstract The effects of uniaxial-biaxial phase transition on the spectral densities measured from the deuteron Zeeman (T 1Z )and quadrupolar (T 1Q ) spin-lattice relaxation times are examined in two partially deuterated samples of 4-n-pentyloxybenzylidene-4‘-heptylaniline(50.7): one deuterated at the methine site (50.7-d1) and one with the aniline ring deuterated (50.7-d4). The deuterated sites are chosen so that their relaxation behaviours are not complicated by internal chain dynamics. It is found that the spectral densities show discontinuities at the Sc - SB phase transition, but show no discontinuity at the SA - SC and SB - SG phase transitions. Both the smectic C and G phases are biaxial. The results are discussed in terms of molecular reorientation and director fluctuations. Preliminary data for the sample director oriented at 90° with the external magnetic field are reported in the B and G phases of 50.7-d1.
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