Influence of mobility of the 90 degrees domain walls on the effective properties of PbTiO3 ceramics

Using the effective medium method, dielectric, piezoelectric and elastic co nstants of the PbTiO3 ceramics have been calculated with the reversible dis placement of the 90 degrees domain walls taken into account. It was assumed , in accordance with the purport of the experiment, that the crystallites c ontained 90 degrees and 180 degrees domains with the latter's concentration depending on the strength of the poling field.