Local Piezoelectric Behavior of Potassium Sodium Niobate Prepared by a Facile Synthesis via Water Soluble Precursors

Nina Senes, Antonio Iacomini, Neus Domingo, Stefano Enzo, Gabriele Mulas, Santiago Cuesta-Lopez, Sebastiano Garroni

    Research output: Contribution to journalArticleResearchpeer-review

    Abstract

    © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Due to the ever-increasing restrictions connected to the use of toxic lead-based materials, the developing of lead-free piezoceramics has become one of the most urgent tasks. In this context, potassium sodium niobate materials (KNN) have attracted a lot of interest as promising candidates due to their excellent piezo properties. For this reason, many efforts have been addressed to optimize the synthesis process now suffering by several drawbacks including the high volatilization of potassium and sodium at the conventional high temperature treatments and the use of expensive metal precursors. To overcome these issues, a new modified Pechini method to synthesize single phase K0.5Na0.5NbO3 powders, from water soluble metal precursors, is presented. Microstructural and structural parameters are characterized by X-ray diffraction (XRD). Depending on the amount of citric acid added to the starting reagents, two pure single-phase K0.5Na0.5NbO3 (2 g citric acid) and K0.3Na0.7NbO3 (0.2 g citric acid), respectively, are obtained with a good crystallinity at a moderate temperature of 500 °C. The piezo responses of the as calcined systems are tested by piezoresponse force microscopy (PFM). K0.5Na0.5NbO3 exhibits a much higher response with respect to the other phase, which relates to the larger crystallinity and to the chemical composition.
    Original languageEnglish
    Article number1700921
    JournalPhysica Status Solidi (A) Applications and Materials Science
    Volume215
    Issue number16
    DOIs
    Publication statusPublished - 22 Aug 2018

    Keywords

    • X-ray diffraction
    • lead-free piezoceramics
    • modified-pechini method
    • piezoresponse force microscopy
    • potassium sodium niobate

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