화학공학소재연구정보센터
Journal of the American Ceramic Society, Vol.85, No.4, 844-850, 2002
Effect of a transverse tensile stress on the electric-field-induced domain reorientation in soft PZT: In situ XRD study
The effect of a transverse tensile stress on the electric-field-induced 90degrees-domain reorientation in tetragonal lead zirconate titanate (PZT) near the morphotropic phase boundary was investigated in situ using X-ray diffraction (XRD). The XRD intensity ratio, I-(002)/I-(200), which represents the ratio of the volume of the c-domains to that of the a-domains on the PZT surface, was examined as a function of the electric field at various stress levels. It was found that a transverse tensile stress changes the electric-fleld dependence of I-(002)/I-(200), especially at higher electric fields. Without a transverse tensile stress, I-(002)/I-(200) began to saturate at E approximate to 800 kV/m. With a transverse tensile stress of 75 MPa, I-(002)/I-(200) increased with an upward curvature with the electric field, indicating that the transverse tensile stress enhanced the field-induced 90% domain reorientation, and increased the effective piezoelectric coefficients at larger electric fields. At E = 900 kV/m, the estimated d(31,domain) changed from -200 x 10(-12) V/m at zero stress, to -350 X 10(-12) V/m at 75 MPa.