Effects of CuO doping on the sintering behavior and piezoelectric properties of lead-free (K0.41Na0.59)(Nb0.84Sb0.06Ta0.10)O3 ceramics

IF 2.5 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY Applied Physics A Pub Date : 2025-02-18 DOI:10.1007/s00339-025-08336-x

Le Tran Uyen Tu, Le Dai Vuong, Trinh Ngoc Dat, Vo Thanh Tung

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Abstract

(K_0.41Na_0.59)(Nb_0.84Sb_0.06Ta_0.10)O₃ + x wt% CuO (KNNST + x Cu, 0 ≤ x ≤ 0.1) ceramics were prepared using a two-step sintering technique. The effects of CuO on the sintering behavior, the phase structure, surface morphologies, and the piezoelectric properties of the (K_0.41Na_0.59)(Nb_0.84Sb_0.06Ta_0.10)O₃ (KNNST) ceramics were investigated in details. The experimental results showed that CuO doping improved the “hardened” KNNST + x Cu ceramics through reduced dielectric loss (tanδ) and greatly enhanced mechanical quality factor (Q_m). Additionally, CuO doping significantly improved the piezoelectric properties at low sintering temperatures. The KNNST ceramics obtained excellent overall electrical properties of d₃₃ = 265 pC/N, k_p = 0.50, k_p = 0.41, Q_m = 420, ε_r = 1173, tanδ = 0.015, P_r = 15 µC/cm², and T_m = 325 °C at a sintering temperature of 1050 °C and 0.075 wt% CuO content, which showed that KNNST ceramics were promising candidates for power applications. Besides, CuO content of 0.1 wt% had the highest recoverable energy storage density (W_rec) of 0.34 J/cm³ and energy storage efficiency (η) of 61.0%, expanding the scope of application for CuO-doped KNNST ceramics.

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来源期刊

Applied Physics A 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.40%

发文量

964

审稿时长

38 days

期刊介绍： Applied Physics A publishes experimental and theoretical investigations in applied physics as regular articles, rapid communications, and invited papers. The distinguished 30-member Board of Editors reflects the interdisciplinary approach of the journal and ensures the highest quality of peer review.