Yoshihiro Ishibashi

TL;DR: In this article, the rotational degrees of freedom of a dielectric crystal were considered and the conditions when the micropolar elasticity equations can be reduced to the equations of conventional elasticity theory were discussed.

TL;DR: In this paper, simulations of the switching behavior in a ferroelectric liquid crystal were carried out with the model proposed by Handschy and Clark, showing that there appear to be various types of switching processes for changing surface anchoring force.

TL;DR: The phase transition sequence of CUCl 4, including the incommensurate-commensurate (ferroelastic) transition, is discussed in terms of the Landau-type free energy as discussed by the authors.

TL;DR: In this article, it was shown that Li 2 Ge 7 O 15 undergoes a ferroelectric phase transition of displacive type and the transition is quite or almost continuous, and the Raman spectra support the idea that the phase transition is associated with a soft optic phonon at the Brillouin zone center of the space group Pbcn in the paraelectric phase.

TL;DR: A general approach for the incommensurate states and IC-commensurate (C) transitions in ferroelectrics is presented in this paper, where an emphasis is put on the determination of the free energy as a function of the IC wave vector as well as on the role played by harmonics.