Structure and Properties of a Novel Piezoelectric Zirconate-modified K0.5Na0.5(Nb0.95Ta0.05)O3 Ceramics

doi:10.11901/1005.3093.2024.406

Chinese Journal of Materials Research

2025, Vol. 39

Issue (7): 542-550 DOI: 10.11901/1005.3093.2024.406

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Structure and Properties of a Novel Piezoelectric Zirconate-modified K_0.5Na_0.5(Nb_0.95Ta_0.05)O₃ Ceramics

YIN Qiyi(

), ZHANG Mengjun(

), SI Fan, LIN Fei

School of Energy Materials and Chemical Engineering, Hefei University, Hefei 230601, China

Cite this article:

YIN Qiyi, ZHANG Mengjun, SI Fan, LIN Fei. Structure and Properties of a Novel Piezoelectric Zirconate-modified K_0.5Na_0.5(Nb_0.95Ta_0.05)O₃ Ceramics. Chinese Journal of Materials Research, 2025, 39(7): 542-550.

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Abstract

A novel piezoelectric ceramics (1-x)K_0.5Na_0.5(Nb_0.95Ta_0.05)O₃-x(Bi_0.5Yb_0.5)_0.95Li_0.05ZrO₃was prepared by the conventional solid-phase sintering method, and then was characterized by means of XRD, SEM, EDS, etc. It can be determined that BYLZ incorporates completely into the KNNT lattice in an atomic substitution manner, thereby forming a single perovskite structure, namely, the ceramics is O phase for x = 0.0, O-T phase for x in the range 0.0 < x ≤ 0.02, R-O-T phase for x in the range 0.03 < x ≤ 0.04, and T phase for x in the range 0.04 < x ≤ 0.05. Performance tests show that ceramics achieve the best performance in the polymorphic phase boundary region of x = 0.04:i.e., d₃₃ = 305 pC/N, k_p= 38.17%, ε_r = 1710, tanδ = 2.5%, P_r = 34.63 μC/cm², E_C= 20.67 kV/cm, and T_C = 340 °C.

Key words: inorganic ceramic materials lead-free piezoelectric ceramics solid-phase sintering multiphase coexistence

Received: 03 October 2024

ZTFLH:

TN384

Fund: Natural Science Foundation of Anhui Provincial Department of Education(2022AH010096);2022 New Era Education Quality Project(2022xscx146)

Corresponding Authors: YIN Qiyi, Tel: 19541820704, E-mail: yinqyi@163.com;
ZHANG Mengjun, Tel: 15156557941, E-mail: 3229880447@qq.com

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https://www.cjmr.org/EN/10.11901/1005.3093.2024.406 OR https://www.cjmr.org/EN/Y2025/V39/I7/542

Fig.1 XRD patterns of (1-x)KNNT-xBYLZ ceramics (a) 2θ = 20°-60°, (b) 2θ = 44°-47°

Fig.2 Dielectric constant ε_r of ceramics at low temperatures (a) x = 0, (b) x = 0.01, (c) x = 0.02, (d) x = 0.03, (e) x = 0.04, (f) x = 0.05

Fig.3 Rietveld refinement on XRD patterns for x = 0.01 (a), x = 0.02 (b), x = 0.03 (c), and x =0.04 (d)

Table 1 Crystal structure parameters of (1-x) KNNT-xBYLZ ceramics

Fig.4 Surface morphologies of (1-x)KNNT-xBYLZ ceramics (a) x = 0, (b) x = 0.01, (c) x = 0.02, (d) x = 0.03, (e) x = 0.04, (f) x = 0.05

Fig.5 Densities and relative densities of (1-x) KNNT-xBYLZ ceramics with the change of x, the inset graph shows the trend of grain size change

Fig.6 Grain size distribution of (1-x)KNNT-xBYLZ ceramics (a) x = 0.0, (b) x = 0.01, (c) x = 0.02, (d) x = 0.03, (e) x = 0.04, (f) x = 0.05

Fig.7 d₃₃ and k_p (a), ε_rand tanδ (b) of the (1-x)KNNT-xBYLZ ceramics

Fig.8 Dielectric temperature spectrum change curve (a) and phase diagram (b) of (1-x) KNNT-xBYLZ ceramics

Fig.9 P-E curves (a), residual P_r and E_C values (b), ε_rP_r and d₃₃ values (c) of (1-x)KNNT-xBYLZ ceramics

Table 2 Comparison of the experimental data with the electrical properties of other KNN-based piezoelectric ceramics

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