Polarising large area sheets of ferroelectric material

摘要

Polarising at least one sheet of ferroelectric material (1) comprises: (a) placing films of ferroelectric material (2,3), of thickness e1, against the opposing faces (1a, 1b) of the sheet (1) of thickness e2, where e1 is a function of e2, and the coercive fields of the materials constituting the sheet (1) and the films (2, 3); (b) positioning electrodes (4, 5) on both sides in contact with the films of ferroelectric material (2, 3); (c) compressing the resulting assembly; and (d) applying a cyclic electrical voltage to the two electrodes (4, 5).