High-density lead zirconate titanate (PZT) ceramics were fabricated for the first time at a temperature as low as 800 degrees C via the hot isostatic pressing (HIP) of a PZT powder with a modified composition of 0.92Pb(Zr0.53Ti0.47)O-3-0.05BiFeO(3)-0.03Ba(Cu0.5W0.5)O-3 that contained 0.5 mass% MnO2, The resultant PZT ceramics exhibited a microstructure that was denser and finer than that of PZT sintered at 935 degrees C, which is the lowest temperature for the densification of the same composition via normal sintering, The relevant dielectric and piezoelectric properties of the HIPed PZT ceramics were as follows: coefficient of electromechanical coupling (K-31), 31.8%; mechanical quality factor (Q(m)), 1364; piezoelectric constant (d(31)), -73.7 x 10(-12) C\N; relative dielectric constant (epsilon(33)(T)/epsilon(0)), 633; dielectric loss factor (tan delta), 0.5%; Curie temperature (T-c), 285 degrees C; and density (rho), 8.06 g/cm(3). In addition to these reasonably good piezoelectric properties, the HIPed PZT exhibited better mechanical properties-particularly, higher fracture strength-than the normally sintered PZT.