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Unique Dielectric Behavior of 0.6Pb(Ni 1/2 W 1/2 )O 3 ·0.4PbTiO 3 Derived from Mechanical Activation
Author(s) -
Gao Xingsen,
Xue Junmin,
Wang John,
Yu Ting,
Shen Ze Xiang
Publication year - 2003
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2003.tb03376.x
Subject(s) - dielectric , materials science , sintering , annealing (glass) , perovskite (structure) , raman spectroscopy , atmospheric temperature range , tetragonal crystal system , activation energy , oxide , analytical chemistry (journal) , mineralogy , crystallography , crystal structure , composite material , chemistry , metallurgy , thermodynamics , optoelectronics , physics , chromatography , optics
0.6Pb(Ni 1/2 W 1/2 )O 3 ·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 950°C. It exhibits a considerably stable temperature dependence of dielectric constant over the wide temperature range of −120° to 20°C, although there occurs a dielectric peak at around 74°C. Raman spectroscopic studies show the coexistence of tetragonal and pseudocubic perovskite phases on sintering at 950°C, which are attributed to the inhomogeneous distribution of PbTiO 3 arising from mechanical activation. The dielectric behavior can be fine tuned by thermal annealing at 750°C, leading to phase redistribution in PNW‐PT.