Characterization of Mn-modified Pb(Mg1/3Nb2/3)O3–PbZrO3–PbTiO3 single crystals for high power broad bandwidth transducers

Shujun Zhang; Sung-Min Lee; Dong-Ho Kim; Ho-Yong Lee; Shrout, Thomas R.
September 2008
Applied Physics Letters;9/22/2008, Vol. 93 Issue 12, p122908
Academic Journal
The effect of MnO2 addition on the dielectric and piezoelectric properties of 0.4Pb(Mg1/3Nb2/3)O3–0.25PbZrO3–0.35PbTiO3 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 kV/cm), 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.


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