PROCESS FOR MAKING PIEZOELECTRIC MULTIDOMAIN -STRUCTURE MONOCRYSTALS FOR PRECISE POSITIONING DEVICES Russian patent published in 2004 - IPC

FIELD: production of ferroelectric monocrystals with formed domain structure, possibly for using in precise positioning devices, for example for probe microscopes and also for aligning optical systems.

SUBSTANCE: method comprises steps of forming blank from ferroelectric monocrystals inside which it is possible to create domains only with 180 degree boundaries; forming blank in such a way that at least two its faces are mutually parallel and its other faces are normal relative to parallel ones and they do not coincide with direction of spontaneous polarization; then moving blank in heat field of furnace out of zone with temperature more than Curie point to zone with temperature lower than Curie point; simultaneously applying to parallel faces of blank periodically changed sign-variable electric field; cooling the whole volume of blank lower than Curie point for creating domain structure in it. Size of domains are set depending upon blank motion speed and polarity change period of applied electric field. Then blank is separated by plates, each plate has two faces parallel relative to domain boundaries and having the same number of domains of opposite polarity.

EFFECT: enlarged functional possibilities of monocrystal due to increased area restricted by domain boundaries, increased domain volume, possibility for orienting polarization vector of domain by any preset angle relative to domain boundary, possibility for creating strictly regular domain structures and domain structures changed according to desired law.

8 cl, 1 ex, 8 dwg