Lead-free K0.5Na0.5NbO3-K5.4Cu1.3Ta10O29-MnO2(KNN-KCT-Mn) ceramics have been prepared by a conventional ceramic sintering technique. The ceramics show excellent piezoelectric properties for application in power devices, and the optimum properties measured are as follows: piezoelectric constant d33= 90 pC/N, planar electromechanical coupling factor kp= 0.40, mechanical quality factor Qm= 1900, remanent polarization Pr= 11.8 μC/cm2, coercive field Ec= 0.85 kV/mm. A Rosen-type piezoelectric transformer with a dimension of 21 mm × 6 mm × 1.2 mm was fabricated using the KNN-KCT-Mn ceramics. Properties of the piezoelectric transformer operating in the first and second modes have been characterized. For the first mode, the transformer has a maximum output power of 0.7 W with a temperature rise of 14 °C. For the second mode, the maximum output power of the transformer is 1.8 W with a temperature rise of 33 °C. KNN-KCT-Mn ceramics have shown to be a potential lead-free candidate to be used in high-voltage-low-current devices.
|Number of pages||6|
|Journal||Journal of Materials Science|
|Publication status||Published - 1 Jan 2008|
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering