The effect of MnO2 addition on the dielectric and piezoelectric properties of 0.4Pb (Mg13 Nb23) O3 -0.25PbZr O3 -0.35PbTi O3 single crystals was investigated. Analogous to acceptor doping in "hard" Pb (Zr,Ti) O3 based polycrystalline materials, the Mn doped crystals exhibited enhanced mechanical Q (∼1050) with low dielectric loss (∼0.2%), while maintaining ultrahigh electromechanical coupling k33 >90%, inherent in domain engineered single crystals. The effect of acceptor doping was also evident in the build-up of an internal bias (Ei ∼1.6 kVcm), shown by a horizontal offset in the polarization-field behavior. Together with the relatively high usage temperature (TR-T ∼140 °C), the Mn doped crystals are promising candidates for high power and broad bandwidth transducers.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)