Method for Obtaining Lead-free Piezoelectric Materials and Corresponding Lead-free Piezoelectric Materials

A method for obtaining lead-free piezoelectric materials, comprising:

• Step S100, adjusting the T/O phase boundary of a first lead-free piezoelectric material:
• for the first lead-free piezoelectric material, adjusting the T/O phase boundary between the tetragonal phase T and the orthorhombic phase O to be near the room temperature or to be near the service temperature of the material by doping, wherein the near the service temperature comprises any one of the following:
• −20° C.-40° C., above 40° C. or below −20° C.;
• Step S200, further adjusting the C/T phase boundary and the O/R phase boundary:
• further adjusting the C/T phase boundary between the cubic paraelectric phase C and the tetragonal phase T, and the O/R phase boundary between the orthorhombic phase O and the rhombohedral phase R by doping, so as to enable the C/T phase boundary and the O/R phase boundary to approach the T/O phase boundary;
• and
• Step S300, obtaining second lead-free piezoelectric materials:
• obtaining multiple second lead-free piezoelectric materials with different piezoelectric constants d33 and different Curie temperatures TC in the process that the C/T phase boundary and the O/R phase boundary approach the T/O phase boundary.