Abstract
Single crystals of K0.47Na053NbO3 (KNN) and Mu-substituted KNN (Mn-KNN, K0.53Na0.47Mn0.004Nb0.996Oy) were grown by a flux method, and the influence of lattice defects on the polarization and leakage current properties was investigated. As-grown KNN did not show an apparent polarization hysteresis loop due to its large leakage current (~10-3 A/cm2). 0.4 at.%-Mn-KNN annealed at 1100oC in air exhibited a low leakage current ( ~ 10-8 A/cm2), a relatively large remanent polarization of 40 microC/cm2 and a coercive field of 12 kV/cm at 25oC. The oxidation of Mn and Nb ions during annealing in air was found to play an essential role in the low leakage current in Mn-KNN. Mn substitution followed by annealing under moderate oxidation condition was effective for reducing leakage current in addition to enhancing polarization property.
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