Synthesis and sintering of PZT ceramics
Nenhuma Miniatura disponível
Data
1999-01-01
Autores
Varela, José Arana [UNESP]
Zaghete, M. A.
Simoes, A. Z.
Cilense, M.
Longo, Elson [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Kluwer Academic/plenum Publ
Resumo
Lead zirconate powder, with Zr/Ti ratio of 50/50 was prepared by polymeric precursor method and doped with 3, 5 and 7 mol% of Sr+2 Or Ba+2, as well as by 0.2 to 5 mol% of Nb+5. The powder was calcined at 750 degrees C by 4 hours and milled during 1.5 h in isopropilic alcohol. Powders were characterized by surface area measurements (BET method), by infrared spectroscopy and by X-ray diffraction to characterize the crystal structure. Isostatically pressed samples were sintered in a dilatometer furnace by using a constant heating rate of 10 degrees C/min from ambient to 1200 degrees C. Synthetic air and air with water vapor were used as atmospheres. Both Sr+2 and Ba+2 substitute Pb+2 and favor the formation of rhombohedral phase. Otherwise, Nb+5 substitute preferentially Zr+4 favoring tetragonal phase. The concentration of dopants and the atmosphere influence the densification and the microstructure of the PZT, which alters the dielectric and piezoelectric properties of the ceramics.
Descrição
Palavras-chave
Como citar
Advanced Science and Technology of Sintering. New York: Kluwer Academic/plenum Publ, p. 355-366, 1999.