Abstract

Abstract We present the phase diagram of a binary system of two nematogenic terminal, non-polar compounds in which an induced smectic A phase appears over a large concentration–temperature range. X-ray measurements give evidence that the layer spacing, d, of this induced smectic A phase is clearly larger than the average molecular length, L (d/L:112 … 1.23). The unusual experimental results are interpreted on the basis of a pronounced steric interaction by which gaps between the large double swallow-tailed compounds are filled with small molecules. We propose the term filled smectic A phase for this new type of induced phase.

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