Abstract
The peculiarities of the electric field-induced phase transition in lead magno-niobate (PMN) and lead zinc-niobate (PZN) crystals have been investigated by means of the small-angle light scattering (SALS) and optical transmission techniques. In PMN crystal, a percolation phase transition, accompanied by an anomalous peak of SALS intensity upon heating in an electric field has been detected. In PZN crystals no narrow peak in any regime of electric field application up to 15 kV/cm has been found. The possible reasons for the variety of paths by which the macrodomain ferroelectric phase can be induced in these crystals are discussed
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