A dispersed polycrystalline phase boundary constructed in CaZrO3 modified KNN based ceramics with both excellent piezoelectric properties and thermal stability |
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| Affiliation: | 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing, 100083, PR China;2. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing, 100088, China;1. School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China;2. School of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai, Guangdong, 519082, China;3. State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou, Guangdong, 510006, China;1. Sichuan Prov Key Lab Informat Mat, Southwest Minzu University, Chengdu 610041, China;2. Department of Materials Science, Sichuan University, Chengdu 610064, China;3. Southwest Institute of Technical Physics, Chengdu 610041, China;1. Departamento de Química Inorgánica y Orgánica, Universitat Jaume I, Castellón, Spain;2. Universitat Politècnica de Catalunya, Nanoenginyeria de materials aplicats a l’energia, Sant Adrià de Besòs, Spain;3. Departamento de Química Inorgánica y Orgánica, Sección Inorgánica, Facultad de Química, Universitat de Barcelona, Barcelona, Spain |
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| Abstract: | In this paper, the ceramics with composition of (0.98-x)(K0.5Na0.5)(Nb0.96Sb0.04)O3-0.02(Bi0.5Na0.5)(Zr0.8Ti0.2)O3-xCaZrO3 (abbreviated as (0.98-x)KNNS-0.02BNZT-xCZ, x = 0, 0.01, 0.015, 0.02, 0.025, 0.03) were prepared by a traditional solid-state reaction method. The effect of the additional amount of CaZrO3 on the phase structure, microstructure, dispersion index, domain structure and piezoelectric properties of ceramics was systematically studied. Finally, the piezoelectric properties and thermal stability of ceramics could be controlled by adding different amounts of CaZrO3. The addition of CaZrO3 transferred the phase structure of the ceramics from orthogonal-tetragonal (O-T) coexistence phase to rhombohedral-orthogonal (R–O) coexistence phase, which could be demonstrated by XRD test, temperature-dependent Raman spectra and εr‐T plot analysis. And when x = 0.02, the ceramics possessed the best piezoelectric and dielectric properties (d33 = 253 pC/N, εr = 1185, tanδ = 0.044). Such excellent electrical properties could be originated from the heterogeneous domain structure and small-size nano-domains of the ceramics. Moreover, with the increase of CaZrO3 doping amount, the dispersion index of ceramics gradually increased from 1.404 to 1.871, which showed more obvious dispersion phase transition characteristics and improved the thermal stability of ceramics. Particularly, when x = 0.02, after annealing at a high temperature of 220 °C (close to its Curie temperature), the d33 tested at room temperature remained above 85% of that without annealing. The results indicated that (0.98-x)KNNS-0.02BNZT-xCZ ceramic was a promising lead-free piezoelectric ceramic system. |
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| Keywords: | KNN based ceramics Thermal stability of piezoelectric properties |
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