Unique dielectric behavior of 0.6Pb(Ni1/2W1/2)O-3 center dot 0.4PbTiO(3) derived from mechanical activation

作者：Gao XS; Xue JM; Wang J

来源：Journal of the American Ceramic Society, 2003, 86(5): 791-794.

0.6Pb(Ni1/2W1/2O3.0.4PbTiO(3)(0.6PNW.0.4PT) of complex perovskite structure is successfully synthesized by mechanical activation of mixed oxide composition, followed by sintering at 950degreesC. It exhibits a considerably stable temperature dependence of dielectric constant over the wide temperature range of -120degrees to 20degreesC, although there occurs a dielectric peak at around 74degreesC. Raman spectroscopic studies show the coexistence of tetragonal and pseudocubic perovskite phases on sintering at 950degreesC, which are attributed to the inhomogeneous distribution of PbTiO3 arising from mechanical activation. The dielectric behavior can be fine tuned by thermal annealing at 750degreesC, leading to phase redistribution in PNW-PT.

• 出版日期2003-5