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Abstract
The studies of superlattices in ferroelectric crystals have made a rapid progress since 1980s. A superlattice is composed of modulated domains on the micron scale, controllable with modern techniques. It reveals a number of novel physical properties of optical and acoustic character. In this paper, we review recent advances in developing new techniques for fabrication and characterization of ferroelectric superlattices, and in exploring new physical effects for applications. The outlook for superlattice applications is briefly described.