(1 - x)Pb(Hf 1-yTi y)O 3-x Pb(Mg 1/3Nb 2/3)O 3 (x = 0.1 ∼ 0.25, y = 0.555) ternary piezoelectric ceramics were prepared using the two-step precursor method. Morphotropic phase boundary (MPB) compositions, located at x = 0.18 ∼ 0.22, were confirmed using X-ray diffraction and by their dielectric, piezoelectric and ferroelectric properties. The optimum dielectric and piezoelectric properties were achieved for the MPB composition 0.8Pb(Hf 0.445Ti 0.555)O 3-0.2Pb(Mg 1/3Nb 2/3)O 3, with dielectric permittivity ε r, piezoelectric coefficient d 33, planar electromechanical coupling k p and Curie temperature T C being on the order of 2800, 680 pC/N, 70% and 276 °C, respectively. Of particular significance is that the new ternary ceramics exhibit comparable piezoelectric and electromechanical properties to commercial PZT5H ceramics, but with much improved T C, showing a potential for applications at elevated temperature.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics