Ferroelectric Transformations of Tensorial Properties in Regular Ferroelectrics

Abstract

There are 19 kinds of regular ferroelectrics. Their tensorial properties are changed with their state transition in a manner unique and definite to each of the 19 kinds. A systematic investigation is made into this manner of change. The kinds of tensors examined are the polar and axial tensors of ranks two, three, and four. This theory is expected to serve not only for predicting the manners of change of the tensorial properties in the regular ferroelectrics, but also for determining the kind of a regular ferroelectric crystal and for judging regularity or irregularity of a ferroelectric crystal.