Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 544, Issue -, Pages 125-128Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2012.07.135
Keywords
Bismuth layer-structured; Piezoelectric ceramics; Microstructure; Na0.25K0.25Bi2.5Nb2O9
Categories
Funding
- National Natural Science Foundation of China [50862005, 51062005, 91022027]
- Natural Science Foundation of Jiangxi [2010GQW0037, 2010GQW0038, 20114BAB216018]
- Foundation of Training Academic and Technical Leaders for Main Majors of Jiangxi [2010DD00800]
- Colleges and Universities advanced ceramics scientific and technological innovation team of Jiangxi
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Bismuth layer-structured ferroelectric ceramics Na0.25K0.25Bi2.5Nb2O9+xmol% MnCO3 (NKBN-Mn) were synthesized by a traditional solid-state reaction. The effects of Mn addition on the microstructure and electrical properties of ceramics have been investigated in details. It was found that the ceramics possess a pure phase of bismuth oxide layer-type structure. The Curie temperature T-c gradually decreases from 653 to 624 degrees C with increasing the Mn modification. The electrical properties of NKBN-based ceramics are improved significantly by the addition of Mn. The piezoelectric constant d(33), dielectric loss tan delta, mechanical quality factor Q(m) and remanent polarization P-r for the NKBN ceramics with 3.0 mol% MnCO3 modification were found to be 25 pC/N, 0.28%, 2817, 14.50 mu C/cm(2), respectively, together with the high T-c (similar to 643 degrees C) and stable piezoelectric properties, demonstrating that the Mn modified NKBN-based ceramics are the promising candidates for high-temperature applications. (C) 2012 Elsevier B.V. All rights reserved.
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