A high temperature stable piezoelectric strain of KNN-based ceramics. Issue 41 (11th October 2018)

• Record Type: Journal Article
• Authors: Cen, Zhenyong; Huan, Yu; Feng, Wei; Yu, Yan; Zhao, Peiyao; Chen, Lingling; Zhu, Chaoqiong; Li, Longtu; Wang, Xiaohui
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 41(2018)
• Page Start: 19967
• Page End: 19973
• Publication Date: 2018-10-11
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta07908k
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : Lead-free (1 − x )(0.96K0.46 Na0.54 Nb0.98 Ta0.02 O3 –0.04Bi0.5 (Na0.82 K0.18 )0.5 ZrO3 )– x CaZrO3 ((1 − x )(0.96KNNT–0.04BNKZ)– x CZ) piezoelectric ceramics were prepared by the conventional solid-state reaction method. Abstract : Lead-free (1 − x )(0.96K0.46 Na0.54 Nb0.98 Ta0.02 O3 –0.04Bi0.5 (Na0.82 K0.18 )0.5 ZrO3 )– x CaZrO3 ((1 − x )(0.96KNNT–0.04BNKZ)– x CZ) piezoelectric ceramics were prepared by the conventional solid-state reaction method. The CaZrO3 dopant can induce a coexisting phase boundary with the transition from the orthorhombic/tetragonal phase to the R phase. Domains that exist across the grain boundary within neighboring grains appear in the ceramics with x = 0.01, which can result in an increase in ferroelectricity due to its long-range order organization. The CaZrO3 dopant results in the formation of polar nanodomains and induces the appearance of diffuse ferroelectrics. The ceramics with x = 0.01 show optimal piezoelectric properties ( d 33 = 300 pC N −1 and = 500 pm V −1 at 25 kV cm −1 ). Meanwhile, their high level of unipolar strain reaches up to 0.175% at 35 kV cm −1 at room temperature, and their field-induced strain varies less than 10% from room temperature to 120 °C. The ceramics with x = 0.02 possess a remarkably high temperature stability of ( T e = 200 °C). For x = 0.005–0.025, a higher amount of the CaZrO3 dopant can obviously improve the temperature stability of The (1 − x )(0.96KNNT–0.04BNKZ)– x CZ system is a promising lead-free piezoelectric candidate material for commercial applications.