Phase Diagrams of Novel MAX Phases

A theoretical investigation of Tin+1AlCn and Mn2GaC MAX phases: phase stability and materials properties

This thesis presents theoretical research on MAX phases (M=transition metal, A=A-group element, X=carbon and/or nitrogen), with focus on predictions of phase stability as well as of physical properties. The first part is an investigation of the phase stability of the MAX phases Ti2AlC, Ti3AlC2, and Ti4AlC3 at elevated temperatures, where the former two phases have been obtained experimentally. ...

Correct Phase-Diagrams of Liquid-Crystals Reported To Exhibit the (Nonexistent) Incommensurate Smectic-A Phases

Three different incommensurate phases predicted by the phenomenological theory of frustrated smectics were reportedly found in mixtures of DB80CN and 80BCAB and DB,OCN and 80CB. The results of our high-resolution X-ray diffraction study of these materials show that these phases are, indeed, coexistences of two or more smectic-A phases. The correct phase diagrams of the two systems are found to ...

Liquid-ordered phases induced by cholesterol: a compendium of binary phase diagrams.

Mixtures of phospholipids with cholesterol are able to form liquid-ordered phases that are characterised by short-range orientational order and long-range translational disorder. These L(o)-phases are distinct from the liquid-disordered, fluid L(alpha)-phases and the solid-ordered, gel L(beta)-phases that are assumed by the phospholipids alone. The liquid-ordered phase can produce spatially sep...

Phase diagrams for the blue phases of highly chiral liquid crystals.

Zippering and intermeshing: Novel phase diagrams for interfaces and films.

New surface and layering phase diagrams are proposed based on generalized sine-Gordon models with and without a substrate potential. In particular, we find that the preroughening transition can be driven first order, explaining “zipper” features in heat capacity data for argon and krypton on graphite substrates. For different parameters, we predict the existence of a novel variant of den Nijs’ ...