Journal
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
Volume 25, Issue 2, Pages 653-658Publisher
SPRINGER
DOI: 10.1007/s10854-013-1688-y
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Funding
- National Science Foundation of China [11174166, 11032010, 11374169]
- Taishan Scholars Program of Shandong Province
- Higher Educational Science and Technology Program of Shandong Province of China [J13LA11]
- Program of Science and Technology in Qingdao City, China [12-1-4-2-(7)-jch, 13-1-4-246-jch]
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Dense relaxor ferroelectric 0.88Pb(Mg1/3Nb2/3)O-3-0.12PbTiO(3) (0.88PMN-0.12PT) ceramics with different La-doping contents (0, 1, 2 and 4 at.%) were sintered by using powders synthesized via a solid-state reaction route. The effects of La doping on the microstructures and electric properties of the 0.88PMN-0.12PT ceramics were investigated. It was found that the average grain size, remanent polarization P (r), coercive field E (c), Curie temperature T (c) and leakage-current density J of the ferroelectric ceramics decrease significantly with increasing La doping content. The decrease in P (r), E (c) and T (c) can be understood in term of the fact that the substitution of Pb2+ ions by La3+ ions suppresses the long-range coupling of BO6 octahedrons, while the abatement in J can be explained according to the reduction of oxygen vacancies caused by La doping. By fitting the J-E curves, the conduction mechanism of the 0.88PMN-0.12PT ceramics is confirmed to be Ohmic conduction generated from oxygen vacancies. The dielectric and ferroelectric properties of 0.88PMN-0.12PT ceramics are tunable with manipulating the La doping content.
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