Ferroelectric properties of pure and thiourea doped KDP crystals by solution growth method

Pure and thiourea (5 mol%) doped potassium dihydrogen orthophosphate (KDP) single crystals were grown by solution growth method using slow evaporation technique and its ferroelectric properties were analyzed. The KDP and their doped crystals display ferroelectric behavior at ambient temperature, followed by a phase transition from ferroelectric to ferroelectric second-order phase transition and better ferroelectric activity as temperature increases and show no polarization loss after 1200 frequency cycles, as proven by fatigue studies. Remarkable ferroelectric property has been observed in single crystals of KDP and its dopant at room temperature, despite having a Curie point at low temperatures.