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Pyroelectric study of pure, rare earth and metal doped potassium niobate single crystals

ABSTRACT Pure, rare earth Sm3+-doped, Sm3+ and metal Sn4+doped ferroelectric single crystals were grown by controlled cooling of the melt. The crystals were characterized for their pyroelectric behavior over a temperature range of 303 K to 773K. The pyroelectric coefficient shows an anomaly around expected transition temperature. The pyroelectric coefficient also show a change in polarity. The mechanism of pyroelectricity in these grown materials is discussed considering the pyroelectric figure of merit (PFM).