Title :
Microstructural effects on the electromechanical properties of PZT-BF ceramics
Author :
Huebner, W. ; Xue, W.R. ; Lu, P.W.
Author_Institution :
Dept. of Ceramic Eng., Missouri Univ., Rolla, MO, USA
Abstract :
In this study microstructure/property relationships were explored for piezoelectric ceramics with a composition of 0.97[(Pb0.95Sr0.05)(Zr0.514Ti0.484 )O3] -0.03BiFeO3. Very minor changes in the sintering temperature (1290-1310°C) or soak time (1.5-3.5 h) resulted in large differences in the electromechanical properties. Specifically, higher sintering temperatures resulted in no residual grain boundary phases, but larger grain sizes and/or variations in the defect structure resulted in lower permittivities, piezoelectric coefficients, and lower mechanical Q´s. The sintering time exhibited an optimal value; too short or too long resulted in poor performance. This study points clearly illustrates the difficulty in performing systematic compositional studies when the role of the microstructure can be dominant
Keywords :
bismuth compounds; crystal defects; crystal microstructure; ferroelectric materials; grain size; lead compounds; permittivity; piezoceramics; piezoelectricity; sintering; stoichiometry; 1.5 to 3.5 h; 1290 to 1310 C; Pb0.95Sr0.05Zr0.514Ti0.484O 3-BiFeO3; defect structure; electromechanical properties; grain size; mechanical Q´s; microstructure; permittivity; piezoelectric ceramics; sintering temperature; soak time; Ceramics; Dielectric constant; Dielectric losses; Dielectric measurements; Grain size; Impedance; Microstructure; Performance evaluation; Temperature; X-ray diffraction;
Conference_Titel :
Applications of Ferroelectrics, 1994.ISAF '94., Proceedings of the Ninth IEEE International Symposium on
Conference_Location :
University Park, PA
Print_ISBN :
0-7803-1847-1
DOI :
10.1109/ISAF.1994.522322
