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Perovskite phase formation and electrical properties of Pb(Fe 1/2 Nb 1/2 )O 3 ferroelectric ceramicse
Author(s) -
Sun Renbing,
Tan Wei,
Fang Bijun
Publication year - 2009
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200824432
Subject(s) - dielectric , materials science , ferroelectricity , wolframite , calcination , perovskite (structure) , doping , dielectric loss , analytical chemistry (journal) , ceramic , mineralogy , electronegativity , phase (matter) , crystallography , composite material , chemistry , metallurgy , optoelectronics , catalysis , tungsten , organic chemistry , chromatography , biochemistry
Pb(Fe 1/2 Nb 1/2 )O 3 (PFN) ferroelectric ceramics with pure perovskite structure were synthesized successfully by conventional solid‐state reaction method via the direct calcining route and the wolframite precursor route. The feasible formation of pure perovskite phase PFN can be attributed to its appropriate tolerance factor and electronegativity difference. PFN ceramics prepared by the above both methods exhibit broad dielectric response peaks ( ϵ m ) accompanied by large dielectric loss and apparent dielectric frequency dispersion, with temperatures of dielectric maximum ( T m ) locating at around 90 °C. 0.25 wt% MnO 2 and 0.25 wt% Li 2 CO 3 doping can greatly decrease dielectric loss and sharpen dielectric response peaks of the PFN ceramics synthesized by the above both methods. The dielectric frequency dispersion is also suppressed accordingly. However, T m of the MnO 2 ‐ and Li 2 CO 3 ‐doped PFN ceramics maintains almost invariable. The remanent polarization ( P r ) of the MnO 2 ‐ and Li 2 CO 3 ‐doped PFN ceramics prepared by the wolframite precursor method is slightly larger than P r of those prepared by the direct calcining method. Piezoelectric constant d 33 of the 0.25 wt% MnO 2 ‐doped PFN ceramics prepared by the direct calcining method is the largest among all the samples synthesized, reaching 134 pC/N. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)