Specific Volume Studies onp-Azoxyanisole

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Abstract
The temperature variation of the specific volume of p-azoxyanisole was studid in the solid, nematic and isotropic phases. Seensitive measurements reveal that the specific volume does not vary linearly during solid-nematic phase transition, but is accompanied by an abrupt large jump of 7.74%. Specific volume jump at the nematic-isotropic transition is 0.35%. Pretransitional variations are found to occur only on the low temperature side of the phase transitions and are absent on the high temperature side. These results can be best explained on the basis of the Maier-Saupe theory.