Pb(In1/2Nb1/2)O3–Pb(Mg1/3Nb2/3)O3–PbTiO3 Piezoelectric Single-Crystal Rectangular Beams: Mode-Coupling Effect and Its Application to Ultrasonic Array Transducers

Abstract

Pb(In 1/2 Nb 1/2 )O 3 -Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PIN-PMN-PT) piezoelectric single-crystal rectangular beams with the PIN:PMN:PT ratio of 0.33:0.35:0.32 are prepared, and their mode-coupling effect is investigated both theoretically and experimentally for ultrasonic array transducer applications. The PIN-PMN-PT rectangular beams become a tall-narrow beam and a short-wide plate, and so exhibiting an uncoupled height-extensional (beam) mode and an uncoupled thickness-extensional (plate) mode, at a width-to-height ratio G (= L/H) of <0.7 and >6.0, respectively. With G varying in the range of 1.6 to 3.1, the beam mode not only couples strongly with the width (lateral) mode, but also coexists obviously with the plate mode, giving high electromechanical coupling coefficients k' 33 and k t of~0.75 and~0.50, respectively. With the guide of the mode-coupling results, a multifrequency ultrasonic array transducer having three distinct operational frequencies of 1.52, 2.60, and 6.01 MHz, corresponding to the coupled/coexistent beam mode, lateral mode, and plate mode, respectively, is developed using a mode-coupled rectangular beam of G = 1.6. Two different single-frequency ultrasonic array transducers, fabricated using two different uncoupled rectangular beams, one operating in uncoupled beam mode with G = 0.6 at 2.24 MHz and one working in uncoupled plate mode with G = 10.0 at 5.75 MHz, are also developed for comparison.

Dielectric and piezoelectric properties of Pb[(Mg1/3Nb2/3)0.52(Yb1/2Nb1/2)0.15Ti0.33]O3 single-crystal rectangular plate and beam mode transducers poled by alternate current poling

“…The dielectric and piezoelectric properties of the plate and beam mode of PMN-PT and PMN-PIN-PT SCs produced by the Bridgman process were investigated widely. [30][31][32] However, to date there are no reports on the dielectric and piezoelectric properties of the plate and beam mode of PMN-lead ytterbium niobate Pb(Yb 1/2 Nb 1/2 )O 3 (PYbN)-PT ternary SC transducers by ACP. The PMN-PYbN-PT SCs were obtained by the top-seeded solution growth (TSSG) method, [33][34][35] showing good quality and low residual mechanical stress of SCs.…”

Temperature dependence of mode coupling effect in piezoelectric vibrator made of [001]c-poled Mn-doped 0.24PIN–0.46PMN–0.30PT ternary single crystals with high electromechanical coupling factor*

“…The mode-coupling effect in rectangular beams made of 0.33PIN-0.35PMN-0.32PT ternary single crystals has been studied at room temperature. [7] However, the influence of temperature on the mode coupling effect in a rectangular beam is unclear. Furthermore, there is no research on the mode coupling effect in ternary, cylindrical PIN-PMN-PT single-crystal resonator.…”