K0.5Na0.5NbO3-based Piezoelectric Ceramics: Excellent Temperature Stability and Application in Type 1-3 Transducer

doi:10.15541/jim20240422

Abstract

Abstract:

Potassium-sodium niobate (K_0.5Na_0.5NbO₃) based piezoelectric ceramics are considered the most potential lead-free piezoelectric ceramics due to their excellent piezoelectric coefficient (d₃₃) and high Curie temperature (T_C). However, the temperature stability of its d₃₃ is poor in comparison with the Pb-based piezoelectric ceramics. To solve this problem, (K_0.5Na_0.5)_0.96Li_0.04(Nb_0.95Sb_0.05)O₃-(Bi_0.5Na_0.5)ZrO₃ (KNLNS-BNZ) piezoelectric ceramic with a single tetragonal phase (T phase) was designed and prepared by the conventional solid-state sintering method and texture engineering. It was found that KNLNS-BNZ-based textured ceramic with T phase at room temperature not only possessed a good piezoelectric coefficient (d₃₃=256 pC∙N^-1) and a longitudinal electromechanical coupling coefficient (k₃₃=34%), but also exhibited excellent temperature stability of d₃₃ and k₃₃in comparison to the non-textured ceramics. The change rates of d₃₃ and k₃₃for KNLNS-BNZ-based textured ceramics were 12% and 4% with the measured temperature of 25-250 ℃, respectively. In addition, the 1-3 type transducer composed of KNLNS-BNZ-based textured ceramics and epoxy resin was also prepared and investigated. This 1-3 type transducer not only exhibited a large bandwidth (BW=61.2%) and excellent signal strength (f_c=1 MHz), but also showed excellent temperature stability. As the measured temperature increased to 100 ℃, its bandwidth BW and center frequency f_c were 58.7% and 0.94 MHz, whose rates of change were 4% and 6% in comparison to the results measured at room temperature, respectively. All these results show that KNLNS-BNZ lead-free piezoelectric ceramics have good piezoelectric properties and excellent temperature stability, and the 1-3 type transducer prepared by KNLNS-BNZ can provide reference for the practical application of new lead-free piezoelectric ceramics.

Key words: potassium-sodium niobate, textured ceramic, piezoelectric property, transducer

CLC Number:

TM282

GAO Tianyu, LIU Dong, ZHAO Sixue, DENG Wei, ZHANG Boping, ZHU Lifeng. K_0.5Na_0.5NbO₃-based Piezoelectric Ceramics: Excellent Temperature Stability and Application in Type 1-3 Transducer[J]. Journal of Inorganic Materials, 2025, 40(3): 297-304.

Figures/Tables 6

Fig. 1 XRD patterns and SEM images of KNLNS-BNZ ceramics (a, b) XRD patterns of non-textured (a) and textured (b) ceramics; (c, d) SEM images of non-textured (c) and textured (d) ceramics. Colorful figures are available on website

Fig. 2 Variable temperature Raman spectra of KNLNS-BNZ ceramics (a, b) Variable temperature Raman contour maps of non-textured (a) and textured (b) ceramics; (c) Raman peak shift plots at variable temperature for non-textured and textured ceramics. Colorful figures are available on website

Fig. 3 Delectric properties of KNLNS-BNZ ceramics (a, b) Mesothermal spectra of non-textured (a) and textured (b) ceramics; (c, d) Fit γ values of non-textured (c) and textured (d) ceramics at 10 kHz. Colorful figures are available on website

Fig. 4 Ferroelectric properties of KNLNS-BNZ ceramics (a, d) Variable temperature P-E loops of non-textured (a) and textured (d) ceramics; (b, e) Variable temperature I-E loops of non-textured (b) and textured (e) ceramics; (c, f) Variable temperature Ec and Pr curves of non-textured (c) and textured (f) ceramics. Colorful figures are available on website

Fig. 5 Piezoelectric properties of KNLNS-BNZ ceramics (a) Variable temperature d33 curves of non-textured and textured ceramics; (b) Change rate of d33 of non-textured and textured ceramics; (c, d) Variable temperature k33 curves of non-textured (c) and textured (d) ceramics

Fig. 6 Type 1-3 transducer composed of KNLNS-BNZ textured ceramics and epoxy resin (a) Preparative process of type 1-3 transducer; (b, c) Type 1-3 transducer test pulse signals at room temperature (b) and 100 ℃ (c)

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K_0.5Na_0.5NbO₃-based Piezoelectric Ceramics: Excellent Temperature Stability and Application in Type 1-3 Transducer

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