Influence of MnO2 doping on the dielectric and piezoelectric properties and the domain structure in (K0.5Na0.5)NbO 3 single crystals

Dabin Lin, Zhenrong Li, Shujun Zhang, Zhuo Xu, Xi Yao

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Abstract

MnO2-doped (K0.5Na0.5)NbO3 (KNN) single crystals were grown by high-temperature solution method using K2CO3-Na2CO3 eutectic composition as flux. The effect of the manganese dopant on the dielectric, piezoelectric properties and the domain structure was investigated. The MnO2-doped KNN crystals were found to exhibit higher piezoelectric coefficient d 33 and dielectric permittivity εr when compared with pure KNN crystal, being on the order of 270 pC/N and 730, respectively, for manganese-doped level at 0.5 mol%, with slightly reduced orthorhombic to tetragonal phase transition TO - T, and Curie temperature T C, being on the order of 193° and 416°C, respectively. The domain size of [001]-oriented KNN-Mn crystal was found to be on the order of 5-13 μm at room temperature, smaller than that of the domain size observed in the pure KNN crystal (20-30 μm). The thermal depoling experiments were performed on the [001]-poled KNN-Mn crystals, where the partial depolarization was found to occur at temperatures above 200°C, due to the phase transformation.

Original languageEnglish (US)
Pages (from-to)941-944
Number of pages4
JournalJournal of the American Ceramic Society
Volume93
Issue number4
DOIs
StatePublished - Apr 1 2010

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

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