Abstract
The elastic free energy of the incompressible ferroelectric SmC is constructed in a tensor formalism based on the symmetry argument of the monoclinic structure. Extracting some surface contributions from the total free energy, we find that such a monoclinic SmC phase permits 9 nonchiral, 2 chiral, 1 piezoelectric, and 9 flexoelectric terms in the bulk energy. In addition, the present expression for the elastic free energy is found to be somewhat simplified compared with that previously derived by Dahl and Lagerwall because of the reduction of a certain cross term in their expression. Finally the Euler-Lagrange equations for the layer distortion and the c -director deformation are derived on the basis of the presently proposed elastic free energy.
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