TY - JOUR
T1 - Ac-field-dependent structure-property relationships in La-modified lead zirconate titanate
T2 - Induced relaxor behavior and domain breakdown in soft ferroelectrics
AU - Tan, Qi
AU - Viehland, Dwight
PY - 1996
Y1 - 1996
N2 - The complex dielectric response was studied for various compositions in the (Formula presented) crystalline solution as a function of ac drive amplitude, frequency, and temperature. These studies reveal the presence of nonlinearities with respect to the amplitude of the ac drive. For (Formula presented), the magnitude of the dielectric constant was observed to increase dramatically (∼500-1000%) and the temperature of the dielectric maximum ((Formula presented)) was observed to be shifted down significantly with increasing drive amplitude between 20 and 500 V/cm. In addition, strong frequency dispersion was observed in the nonlinear dielectric response, whereas the linear response was found to be frequency independent. For (Formula presented), the magnitude of the nonlinearities were significantly decreased with increasing La content and the value of (Formula presented) was nearly independent of drive. Frequency dispersion was observed in the linear dielectric response; however, the nonlinear response was noticeably frequency independent. Sawyer-Tower polarization studies then revealed that the polarization behavior was linear in the range of electrical-field strengths used to measure the dielectric responses. These results indicate that the observed dielectric nonlinearities are not due to polarization nonlinearities, but rather related to the dynamics of various stable domainlike structures. On the basis of the results, an attempt is made to distinguish the similarities and differences between soft and relaxor ferroelectric behaviors.
AB - The complex dielectric response was studied for various compositions in the (Formula presented) crystalline solution as a function of ac drive amplitude, frequency, and temperature. These studies reveal the presence of nonlinearities with respect to the amplitude of the ac drive. For (Formula presented), the magnitude of the dielectric constant was observed to increase dramatically (∼500-1000%) and the temperature of the dielectric maximum ((Formula presented)) was observed to be shifted down significantly with increasing drive amplitude between 20 and 500 V/cm. In addition, strong frequency dispersion was observed in the nonlinear dielectric response, whereas the linear response was found to be frequency independent. For (Formula presented), the magnitude of the nonlinearities were significantly decreased with increasing La content and the value of (Formula presented) was nearly independent of drive. Frequency dispersion was observed in the linear dielectric response; however, the nonlinear response was noticeably frequency independent. Sawyer-Tower polarization studies then revealed that the polarization behavior was linear in the range of electrical-field strengths used to measure the dielectric responses. These results indicate that the observed dielectric nonlinearities are not due to polarization nonlinearities, but rather related to the dynamics of various stable domainlike structures. On the basis of the results, an attempt is made to distinguish the similarities and differences between soft and relaxor ferroelectric behaviors.
UR - http://www.scopus.com/inward/record.url?scp=0001180215&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.53.14103
DO - 10.1103/PhysRevB.53.14103
M3 - 文章
AN - SCOPUS:0001180215
SN - 1098-0121
VL - 53
SP - 14103
EP - 14111
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 21
ER -