Averaging physical constants and the problem of connection between piezoelectric properties of single-crystal and ceramic ferroelectrics

This paper is devoted to the analysis of different methods for averaging the physical constants of ferroelectric crystals as well as to the calculation of the piezoelectric coefficients d/sub ij/* and their anisotropy d/sub 33/*/|d(31)*| for PbTiO/sub 3/-type ceramics under a polarizing electric field.