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Relationship between the Curie temperature (TC) and spontaneous polarization (Psat) for conventional ferroelectric materials and the present YHO-7 film. The materials include BaTiO3 47,48, PbTiO3 53, PbZr1−xTixO3 50,54, SrBi2Ta2O9 49, Pb2Bi4Ti5O18 55, Ba2Bi4Ti5O18 55, BaBi4Ti4O15 55, Sr2Bi4Ti4O15 56, Bi4Ti3O12 57,58, Bi4−xLaxTi3O12 59,60, and Bi4−xNdxTi3O12 43,61.
