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The n-eicosane, C20H42: n-docosane, C22H46 system has been studied by X-ray crystallo-graphic and calorimetric techniques. The phase diagram exhibits no less than six distinct solid phases. The two terminal solid solutions, γ1 and γ2 are triclinic in keeping with the pure components. An orthorhombic phase, β0, exists at all compositions just below the solidus and has a centered (C or F) lattice. The structure of the low temperature orthorhombic phases β1, β2 (indistinguishable on the basis of powder photographs) has been determined from a single crystal X-ray analysis. The most probable space group of these phases is Bb21 m, the mirror planes required of the molecules perpendicular to their length being obtained by disordering.
Lüth et al. (1974) studied this question.