Properties of (Bi_0.5Na_0.5)TiO₃–BaTiO₃–(Bi_0.5Na_0.5)(Mn_1/3Nb_2/3)O₃Lead-Free Piezoelectric Ceramics and Its Application to Ultrasonic Cleaner

Abstract

The lead-free piezoelectric ceramics 0.82(Bi 0:5 Na 0:5 )TiO 3 -0.15BaTiO 3 -0.03(Bi 0:5 Na 0:5 )(Mn 1=3 Nb 2=3 )O 3 (abbreviated as BNT-BT-BNMN) was prepared by a conventional process of ceramic engineering. The X-ray diffractometer (XRD) analysis showed that all compositions could form a single perovskite phase. The ceramics showed excellent piezoelectric properties with a coupling factor k t ¼ 41%, a mechanical quality factor Q m ¼ 500, a piezoelectric constant d 33 ¼ 110 pC/N, a relative permittivity " T 33 =" 0 ¼ 520, a dissipation factor tan ¼ 0:66%, a Curie point T c ¼ 260 C, and a density ¼ 5:5 g/cm 3 . The physical properties of the ceramics were superior to those of hard Pb(Zr,Ti)O 3 (PZT). The high-power characteristics of the ceramics were superior to those of hard PZT. A cylinder sample of lead-free ceramics was used to fabricate a bolt-clamped Langevin transducer (BLT) for application in the ultrasonic cleaner. The vibration velocity of BLT using the ceramics was higher than that of hard PZT under the same input power. The cleaning effect of an ultrasonic cleaner using the BLTs was very high and sufficiently good for commercial application.

Quenching effects on piezoelectric properties and depolarization temperatures of (Bi0.5Na0.5)TiO3-based solid solution systems

“…8) Furthermore, the tetragonal side compositions of BNBT have also been important for practical applications such as ultrasonic devices. 31,32) Under this circumstance, there is an urgent demand to know how the quenching treatment works on the BNBT solid solution ceramics even with the tetragonal symmetry and MPB. Therefore, in this study, the quenching effects on piezoelectric properties and depolarization temperatures were experimentally investigated on not only rhombohedral BNLT but also BNBT-based solid solution systems with tetragonal and MPB phases.…”

Origin of the large piezoelectric activity in(1−x)Ba(Zr0.2TiAcosta1, Khakpash2, Someya3 et al. 2015Phys. Rev. B1319830View full textAdd to dashboardCite

“…These materials can be co-sintered with cost-effective nickel electrodes [7], which is not currently achievable for PZT [8]. Tou et al [9] laid the groundwork for hard bismuth-based piezoceramics to be used in ultrasonic cleaners, and Doshida et al [10,11] demonstrated that lead-free piezoceramics have better performance than PZT for high power applications. Recently, a BaTiO 3 (BT)-based solid solution, (1 − x)Ba(Zr 0.2 Ti 0.8 )O 3 -x(Ba 0.7 Ca 0.3 )TiO 3 (BZT-xBCT), has attracted considerable attention due to its promising small and large signal piezoelectric properties [12,13].…”

In situ electric field induced domain evolution in Ba(Zr0.2Ti0.8)O3-0.3(Ba0.7Ca0.3)TiO3 ferroelectrics

“…First viable contenders and products are now appearing at the marketplace. [3][4][5] However, the properties of most lead-free materials are still lower in comparison to PZT. [6][7][8] Thus, development of lead-free piezoelectric ceramics is of great interest.…”

“…Therefore, we chose BZT-0.3BCT composition for this study as representative material, which locates deep in the rhombohedral region of the phase diagram. 9,11,12 3 (abbreviated as BZT-0.3BCT) ceramics were synthesized using a conventional solid-state reaction route from oxides and carbonate powders of BaCO 3 (purity 99.8%), ZrO 2 (purity 99.5%), TiO 2 (purity 99.6%), and CaCO 3 (purity 99.5%). Mixed powders were calcined at 1300 C for 2 h and sintered at 1500 C for 2 h. Further information on specimen synthesis can be found elsewhere.…”