Abstract
Data from visual inspection, microscopic observations through a polarizing microscope, and dilatometry on sealed samples have been used to draw a phase diagram for this two-component system that differs from the one originally published on the basis of the same data. The difference lies in the recognition of a mesophase existing in a composition region intermediate between that of the cylindrical (middle) and lamellar (neat) phases. The problems of accounting for these three types of structures include their very narrow miscibility gaps with each other, their extraordinary thermal stability, and the possible absence of any region of direct binary equilibrium between the middle and neat phases.
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