Abstract
The effects of PbO atmosphere on structure and electrical properties of Mn-modified Pb((Zn 1/3Nb 2/3) 0.20(Zr 0.50Ti 0.50) 0.80)O 3 ceramics were investigated. Specimens were prepared with and without a PbZrO 3 protective ambient, by columbite two-stage process in a temperature region from 1050 to 1200 °C. The results indicated that PbZrO 3 powder is favored to the liquid-state sintering process of specimens in PbO vapor pressure equilibrium. The specimens sintered with PbZrO 3 powder showed the homogenous and intergranular microstructure; whereas, the specimens sintered without PbZrO 3 powder demonstrated the inhomogenous and transgranular microstructure. Without protective PbZrO 3 powder, the flow of PbO from the compact to the exterior resulted in the formation of amorphous phase in grain boundaries, which deteriorated the electric properties seriously. By the use of PbO protective atmosphere, the excellent piezoelectric and dielectric properties ( Q m = 1160, tan δ = 0.004, K p=0.54) were obtained at 1100 °C for 2 h.
Published Version
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