Abstract
AbstractThe liquid crystalline smectic mixed phases in eight binary systems have been investigated by X‐ray methods. The mixed phases have orthogonal (sE, sB, sA‐phases) or tilted (sG, sF, s1‐phases) structures. Especially the thickness of the smectic layers d as a function of the concentration has been considered. In the orthogonal phases the function d(x) is related to an averaged molecular length T(x) = xAlA + xBlB, where lA and lB denote the molecular lengths of the compounds A and B in the most stretched all‐trans‐configuration. In the tilted phases besides T(x) the tilt angle β(x) is related to d(x). Adding the second compound the tilted molecular long axes arise within the layers.
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