The invention provides a method for controlling orientation of electrodeformation of a ferroelectric
single crystal. The method for controlling the orientation of the electrodeformation of the ferroelectric
single crystal comprises the following steps: bevelling (001) surface of a trigonal ferroelectric
single crystal, so as to obtain bevelled single
crystal; and initially polarizing the bevelled single
crystal in the presence of an external
electric field, and then polarizing in the presence of an external reverse
electric field, so as to obtain reversely polarized single
crystal. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal has the advantages that the (001) surface of the trigonal ferroelectric single crystal is treated by adopting a bevelling way, so that the surface of the single crystal is not strict (001) in orientation, and ratio of polarization overturn at 109 degrees can be increased when an
electric field is turned over up and down. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal has the advantages that a simple bevelling technology is carried out on a (001)-oriented trigonal ferroelectric single crystal, so that surface normal and a crystal axis are not coincided, symmetry about the surface normal in
spontaneous polarization direction is destroyed, and
occurrence probability of 109-degree polarization overturn is improved, so that control on the orientation of the electrodeformation is realized. The method for controlling the orientation of the electrodeformation of the ferroelectric single crystal has the advantages that warming-assisted polarization is preferred, a single 109-degree domain rotation path can be realized, and an application of ferromagnetic thin film / piezoelectric single crystal
heterojunction equal strain regulation is facilitated.