Presentation and Discussion of Examples of Ferroelectrics and Ferroelastics Having the Index of Faintness Unequal to the Cell Multiplicity

The preceding paper [J. Phys. Soc. Japan 33 (1972) 629] considered, in a general and unified way, ferroelectrics and ferroelastics such that the principal element of electric susceptibility tensor or elastic compliance tensor is almost independent of temperature in the prototypic phase down to the Curie point. Of such ferroelectrics and ferroelastics, ones are possible in which the index of faintness n is unequal to the cell multiplicity m ; as a special case ones are possible which have m =1 or from no superstructure despite of n ≥2. Three imaginable examples are presented and discussed.