High piezoelectric d33 coefficient in Li-modified lead-free (Na,K)NbO3 ceramics sintered at optimal temperature
Abstract
LiNbO3-doped (Na ,K)NbO3 lead-free piezoelectric ceramics were prepared by normal sintering, and the electrical properties were investigated with a special emphasis on the influence of sintering temperature. The ceramics synthesized at 1020-1080°C showed a phase transition from orthorhombic to tetragonal symmetry, which is similar to the morphtropic phase boundary (MPB). Because of such MPB-like behavior, a high piezoelectric coefficient d33 (314pC/N) was obtained in the nominal composition 0.058LiNbO3-0.942[(Na0.535K0.480)NbO3] ceramic sintered at 1060°C; however, this high d33 value was reported previously only in the Li-modified (Na,K)NbO3-based ceramics with codopants of Ta and Sb to B site.
- Publication:
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Applied Physics Letters
- Pub Date:
- June 2007
- DOI:
- Bibcode:
- 2007ApPhL..90x2909Z
- Keywords:
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- 77.84.Dy;
- 77.65.Bn;
- 64.70.Kb;
- 81.20.Ev;
- Niobates titanates tantalates PZT ceramics etc.;
- Piezoelectric and electrostrictive constants;
- Solid-solid transitions;
- Powder processing: powder metallurgy compaction sintering mechanical alloying and granulation