The detailed research of phase diagrams is carried out for Landau’s thermodynamic potential with ℒ=3m symmetry group. All possible types of phase diagrams for the sixth-order expansion of thermodynamic potential in terms of the order parameter components are received. Realization conditions...

Phase diagrams of the crystals undergoing phase transitions induced by irreducible representations with the <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$$\mathcal{L}=43m$$</EquationSource> </InlineEquation> symmetry group have been constructed within the phenomenological theory of the second-order phase transitions. The equations of state of all phases induced by...</equationsource></inlineequation>