Direct observation of intrinsic piezoelectricity of Pb(Zr,Ti)O_3 by time-resolved x-ray diffraction measurement using single-crystalline films

摘要

Lead zirconate titanate, Pb(Zr,Ti)O_3 or PZT, is one of the most widely investigated ferroelectric and piezoelectric materials due to its superior properties. However, the intrinsic properties of PZT have not been directly measured due to the lack of fabrication of single crystals even though a basic understanding of intrinsic properties has been of interest developing lead-free piezoelectric materials. We demonstrated the direct observation of the intrinsic piezoelectric property by means of the detection of electric-field induced crystal lattice distortion of thick Pb(Zr_(0.35)Ti_(0.65))O_3 single-crystalline films with single polar-axis orientation and negligible residual strain using the time-resolved X-ray diffraction (XRD) together with the polarization response. Consequently, the effective converse piezoelectric response was experimentally revealed; hence, the electrostrictive coefficient, which is the conversion coefficient between the electrical and mechanical response, was determined. The obtained effective electrostrictive coefficient was 5.2-6.3 × 10~(-2) m~4/C~2, which agrees with theoretical prediction.