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Abstract
Piezoelectric resonance signal is observed from a crystalline minute single grain (size∼0.4 mm × 0.4 mm × 0.6 mm, mass ∼100 μg) Rochelle salt by using an inductive pulse detection method. A kink in the temperature dependent resonance frequency at the high Curie temperature T ch = 24°C is clearly seen from our measurements with open circuited condition. The kink, which was noted as a morphic effect, is smeared by the applied do electric field. The electric field also induces changes in the resonance frequency in such ways that δf, × k,E + k2E2 and δf, ×E for the high and low temperature nonferroelectric phases, respectively.