Table 5. Classification according to tensor domain states

n_e, n_a, n_i  and  n … number of ferroelectric, ferroelastic, piezoelectric and principal (= orientational) domain states, resp.

ef, ed, eu and ez …  faithful (full), degenerate (partial), null and zero ferroelectric, resp.

af, ad, au …  faithful (full), degenerate (partial), null ferroelastic, resp.

if, id, iu and iz …  faithful (full), degenerate (partial), null and zero ferropiezoelectric (ferroelectroelastic), resp.