The Effect of Pressure on the Poling Condition in Lead-based Relaxor Ferroelectric Solid Solutions

다국어 초록 (Multilingual Abstract)

Topographic images for the domain structures of etched surfaces of PMNT ceramics were observed: ① Flattened fine domain structures with domains of about 50 nm or less in size along the poling direction due to the 180 domain reversal were seen in rhombohedral (74/26), (72/28), and (69/31) ceramics. ② Stereographical fine domain structures with projected domains of about 50 nm or less in size along some directions due to non-180˚ domain reversal, as well as 180˚ domain reversal were seen in the (67/33) ceramic near a MPB composition. Pressure-induced suppression of the electromechanical response occurred at the depoling pressure p_d = 590 MPa for PMNT (67/33) and at p_d = 400 MPa for PMNT (69/31). The poling for the PMNT (72/28) ceramic under a pressure of 600 MPa above pd was done under decreasing pressure at 10 kV/cm at room temperature. The resonance frequency fr and the antiresonance frequency fa decreased to f_r = 121.74 kHz and f_a = 124.03 kHz, the electromechanical coupling coefficient k31 decreased to 20.5%, and the maximum phase angle θ_m decreased to 12˚ compared to f_r = 131.32 kHz and f_a = 135.37 kHz, k31 = 26.8% and θ_m = 52˚ for normal poling. The topographic images of the etched surface of PMNT (72/28) poled under pressure was characterized with stereographical fine domain structures with projected domains of about 100 nm or less in size along some directions due to non-180 domain switching. A poling process using depoling pressure, as well as the well-known normal poling using depoling temperature, is applicable for ferroelectric materials.

참고문헌 (Reference)

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