HYDROSTATIC PIEZOELECTRIC PROPERTIES OF D31-ZERO 0-3 COMPOSITE OF POLYMER AND CERAMIC POWDER MIXTURE OF PZT AND PBTIO3

Hydrostatic piezoelectric constant d(h) of 0-3 composite of polymer and ceramic powder mixture of PZT and PbTiO3 were investigated in order to obtain "d31-zero" constant by applying appropriate reverse poling field to prepoled ones. The composite composition was of chloroprene rubber (25 vol% polymer) and PbTiO3 (PT) ceramic powder mixture of three kinds of the powder having different average particle sizes (3.3 (X), 7.3 (Y), and 31.8 (Z) mu-m) with equivolumed X, Y and Z (X = Y = Z = 1/3), in which the 7.3-mu-m PbTiO3 ceramic powder (Y) was partially or fully replaced by a PZT ceramic powder with 7.5-mu-m average particle size (75 vol% ceramic powder). An improved d(h)-value of 18 x 10(-12) C/N was obtained at the composite in which 80 percent of the 7.3-mu-m PbTiO3 powder was replaced by the 7.5-mu-m PZT powder.