Effects of Mn doping on the structure and electrical properties of high-temperature BiScO3–PbTiO3–Pb(Zn1/3Nb2/3)O3 piezoelectric ceramics

The effects of Mn addition on the structure, ferroelectric, and piezoelectric properties of the 0.35BiScO3–0.60PbTiO3–0.05Pb(Zn1/3Nb2/3)O3 ceramics were studied. The results demonstrate that the addition of small amounts of Mn did not cause a remarkable change in crystal structure, but resulted in an evident evolution in microstructure and ferro-piezoelctric properties. The addition of Mn can induce combinatory “hard” and “soft” piezoelectric characteristics due to aliovalent substitutions. The optimal electrical properties are obtained in the 0.25 mol% Mn-doped composition with a high Curie temperature, indicating that Mn doping contributes to the electrical properties of the ceramics. It can be expected that the improved piezoelectric material can be a promising candidate for high-temperature piezoelectric applications.

The effects of the Mn addition on the structure, ferroelectric and piezoelectric properties of the 0.35BiScO3–0.60PbTiO3–0.05Pb(Zn1/3Nb2/3)O3 ceramics were studied. Mn ions could induce combinatory “hard” and “soft” piezoelectric characteristic due to aliovalent substitutions. The internal field increases for the doped samples till to the saturated situation indicating the development of defect complexes while it remains zero for the undoped one. This can also contribute to the increase of lattice energy which results in the increase of Curie point.Figure optionsDownload as PowerPoint slideHighlights
► Mn doping can effectively improve electrical properties at low doping level.
► Doping mechanism was discussed intensively.
► The theory of internal bias field was introduced to explain the hard characteristic.