Properties and structures of nonstoichiometric (K,Na)NbO3‐based lead‐free ceramics |
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Authors: | Jie Xing Zhi Tan Lixu Xie Laiming Jiang Jing Yuan Qiang Chen Jiagang Wu Wen Zhang Dingquan Xiao Jianguo Zhu |
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Affiliation: | College of Materials Science and Engineering, Sichuan University, Chengdu, China |
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Abstract: | The 0.968[(K0.48Na0.52)]Nb0.95+xSb0.05O3–0.032(Bi0.5Na0.5)ZrO3 [KNNxS–BNZ] lead‐free ceramics with nonstoichiometric niobium ion were fabricated via conventional solid‐state sintering technique and their piezoelectric, dielectric and ferroelectric properties were investigated. When x = 0.010, enhanced piezoelectric properties (d33 ≈ 421 pC/N and kp ≈ 0.47) were obtained due to the construction of rhombohendral—tetragonal phase boundary near room temperature. The KNNxS–BNZ ceramics possesses enhanced Curie temperature (Tc) with improved piezoelectric constant. A large d33 of ~421 pC/N and a high Tc ~256°C can be simultaneously induced in the ceramics with x = 0.010. Especially, good thermal stability was observed in a broad temperature range. The results indicated that our work could benefit development of KNN‐based ceramics and widen their application range. |
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Keywords: | Curie temperature lead‐free ceramics perovskites piezoelectric materials/properties |
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