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Mechanical Activation‐Assisted Synthesis of Pb(Fe 2/3 W 1/3 )O 3
Author(s) -
Ang Seok Khim,
Wang John,
Wan Dongmei,
Xue Junmin,
Li Longtu
Publication year - 2000
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.1151-2916.2000.tb01433.x
Subject(s) - perovskite (structure) , tungstate , nanocrystalline material , sintering , pyrochlore , materials science , oxide , phase (matter) , mineralogy , yield (engineering) , lead oxide , dielectric , analytical chemistry (journal) , chemistry , crystallography , metallurgy , nanotechnology , optoelectronics , organic chemistry , chromatography
Perovskite Pb(Fe 2/3 W 1/3 )O 3 (PFW) was prepared via a mechanical activation‐assisted synthesis route from mixed oxides of PbO, Fe 2 O 3 , and WO 3 . The mechanically activated oxide mixture, which exhibited a specific area of >10 m 2 /g, underwent phase conversion from nanocrystalline lead tungstate (PbWO 4 ) and pyrochlore (Pb 2 FeWO 6.5 ) phases on sintering to yield perovskite PFW, although the formation of perovskite phase was not triggered by mechanical activation. When heated to 700°C, >98% perovskite phase was formed in the mechanically activated oxide mixture. The perovskite phase was sintered to a density of ∼99% of theoretical density at 870°C for 2 h. The sintered PFW exhibited a dielectric constant of 9800 at 10 kHz, which was ∼30% higher than that of the PFW derived from the oxide mixture that was not subjected to mechanical activation.