Abstract
Mechanical properties of PZT ceramics with small amount of Mn and Nb were investigated. The addition of 0.01mol% Mn and 0.02mol% Nb to PZT improved and stabilized their piezoelectric properties. The four point bending strengths of PZT with 0.01mol% Mn and 0.02mol% Nb addition were 85MPa and 63MPa, respectively. And the values of Weibull modulus were 9.1 and 7.8. As for the static mechanical properties, there is no large difference between 2 specimens.
But compared with 0.02mol% Nb, the addition of 0.01mol% Mn to PZT doubled the vickers hardness. As to the 0.01mol% Mn added-PZT, the crack length measured by a micro vickers diamond indentor was anisotropic, and the internal stress measured with the microindetation tecnique increased.
