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For half a century PZT family has been the icon and workhorse of a large class of technologically important materials— piezoelectrics,which can convert between mechanical stress/strain and electrical voltage/charge.Despite its outstanding piezoelectric property,PZT is currently facing global restrictions for use due to its Pb toxicity; thus there is an urgent need to develop a non-Pb substitute that can compete with PZT,in particular with the most important high-end PZT (with a piezoelectric coefficient d33>500pC/N).