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Legislation arising from health and environmental concerns has intensified research into finding suitable alternatives to lead-based piezoceramics.Lead zirconate titanate(PZT)has been developed over several decades to become the market-leading piezoelectric ceramic.Recently,solid solutions based on sodium potassium niobates(K,Na)NbO3(KNN)has become one of the global-desired lead-free counterpart,due to its superior dielectric and piezoelectric properties.