Research articles
ScienceAsia (): 231-236 |doi:
10.2306/scienceasia1513-1874...231
Structural and electrical properties of (1−x)Na0.465K0.465Li0.07Nb0.93Ta0.07O3–xMnO lead-free piezoelectric ceramics synthesized at low sintering temperatures
Pornsuda Bomlaia,d,*, Chanoknate Songsurina, Nantakan Muensitb,d, Steven J. Milnec
ABSTRACT: Ceramics of the lead-free piezoelectric ceramic composition, Na0.465K0.465Li0.07Nb0.93Ta0.07O3, (NKLNT), were prepared using a reaction sintering method. The effects of manganese oxide doping on the structural and electrical properties of NKLNT ceramics were investigated. Variations in the relative intensity of X-ray diffraction peaks were consistent with Mn ions substituting on the perovskite lattice to produce a change in the proportions of co-existing tetragonal and orthorhombic phases. Grain growth during secondary recrystallization was also affected, leading to more uniform microstructures. The temperature of the orthorhombic-tetragonal (O-T) phase transition decreased, and the Curie temperature increased as a result of Mn modifications. The dielectric dissipation factors were lowered by Mn incorporation, but the d33 piezoelectric charge coefficient fell from 190 pC/N to ≤144 pC/N due to the shift in the O-T phase transition to well below room-temperature.
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| a |
Department of Materials Science and Technology, Faculty of Science, Prince of Songkla University, Songkhla 90112 Thailand |
| b |
Department of Physics, Faculty of Science, Prince of Songkla University, Songkhla 90112 Thailand |
| c |
Institute for Materials Research, University of Leeds, Leeds LS2 9JT, UK |
| d |
NANOTEC Centre of Excellence at Prince of Songkla University, Thailand |
* Corresponding author, E-mail: ppornsuda@yahoo.com
Received 24 Mar 2010, Accepted 20 Jun 2010
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