Brazilian Journal of Physics
versão impressa ISSN 0103-9733
LI, Wei et al. Dielectric and piezoelectric properties of Ba(ZrxTi1-x)O3 lead-free ceramics. Braz. J. Phys. [online]. 2010, vol.40, n.3, pp. 353-356. ISSN 0103-9733. http://dx.doi.org/10.1590/S0103-97332010000300018.
Lead-free ceramics Ba(ZrxTi1-x)O3 (x = 0.02-0.2) were prepared using a solid-state reaction technique. The structural and electrical properties were systemically investigated. Crystalline structures and microstructures were analyzed by X-ray diffraction and scanning electron microscope (SEM) at room temperature. All the samples possess pure perovskite structure. A small amount of Zr content has great effect on the microstructure of Ba(ZrxTi1-x)O3 ceramics. The homogeneous microstructure with grain size about 30µm is obtained for the sample at x = 0.05. The phase transitions merge together in one peak for the samples at x = 0.10 and the highest dielectric constant 15900 is obtained for the sample at x = 0.15. The Ba(ZrxTi1-x)O3 ceramics at x=0.05 exhibit excellent piezoelectric properties of high d33 = 208 pC/N, kp = 31.5% and Qm = 500.
Palavras-chave : Ceramics; Microstructure; Dielectric properties; Piezoelectric properties.