Growth and electrical characterization of undoped and Cu-doped (K Na)NbO3 single crystals

Reference Presenter Authors
08-128 Marcus Vinicius Silva Silva, M.V.(UNIFESP); Lead zirconate titanate (PZT) is the most important piezoelectric material due to its high piezoelectric and dielectric properties. However, the toxicity of Pb element increases the need for piezoelectric materials environmentally better but with similar physical properties as PZT. In this context, sodium potassium niobate (KNN) have received much more attention as a possible candidate to substitute Pb-based piezoelectric materials [1]. Over the last decades, both PZT and KNN have been employed by the industry in the form of ceramic bodies. Nevertheless, it is well known that piezoelectric single crystals present much better piezoelectric properties than their counterpart ceramics. In this study undoped KNN and Cu-doped hard KNN piezoelectric single crystal fibers, with compositions near the morphotropic phase boundary (MPB), were grown by the micro-pulling-down technique (µ-PD) and their structural, dielectric, ferroelectric properties were investigated [2]. The structural data revealed that both piezoelectric compositions were successively grown. The dielectric results suggested that the Cu elements were incorporated in both A and B sites of the KNN matrix. In addition, atomic force microscopy analyses revealed for the first time the domain morphology of KNN and KNN-Cu crystals obtained by the µ-PD technique. The influence of doping element on the ferroelectric domain morphology was discussed.
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