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Research articles

ScienceAsia 36 (2010): 231-236 |doi: 10.2306/scienceasia1513-1874.2010.36.231

Structural and electrical properties of (1−x)Na0.465K0.465Li0.07Nb0.93Ta0.07O3xMnO 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