共查询到18条相似文献,搜索用时 140 毫秒
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Bi0.5Na0.5TiO3基无铅压电陶瓷设计与制备研究的新进展 总被引:1,自引:0,他引:1
综述了Bi0.5Na0.5TiO3(BNW)基无铅压电陶瓷体系研究的最新进展,介绍了BNT基无铅压电陶瓷的设计方法及其制备技术.用自洽场离散变分法(self-consult charge-discrete variation-Xa,SCC-DV-Xa)等计算方法可为设计新型BNT基陶瓷提供重要的理论指导.用湿化学法,包括:溶胶-凝胶法、柠檬酸盐法、水热法等,可以合成BNT基纳米粉体,该类方法制备的BNT基粉体具有良好烧结活性,利于致密化烧结,使材料电性能得到改善.用模板晶粒生长技术可获得晶粒生长定向程度很高的BNT基压电陶瓷材料,进而提高材料在特定方向的压电性能. 相似文献
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无铅压电陶瓷的开发与应用是当今压电陶瓷发展的必然趋势,本文综合分析了无铅压电陶瓷的研究背景,给出了钙钛矿型无铅压电陶瓷的主要体系,包括钛酸钡基无铅压电陶瓷、BNT基无铅压电陶瓷,分析比较了其性能及研究现状。 相似文献
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综述了无铅压电陶瓷研究开发的相关进展,着重介绍了BaTiO3基无铅压电陶瓷、Bi1/2Na1/2TiO3(BNT)基无铅压电陶瓷、NaNbO3基无铅压电陶瓷、铋层状结构无铅压电陶瓷及钨青铜结构无铅压电陶瓷等不同陶瓷种类的相关体系、制备方法及压电铁电性能,并对其应用及发展前景进行了展望。 相似文献
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随着人们环保意识的增强,无铅压电陶瓷的研究和开发成为当前压电材料领域研究的热点。本文采用溶胶-凝胶法制备了BNT(钛酸铋钠)粉体,采用干压成型、高温电炉烧成无铅压电陶瓷样品,并对BNT粉体及无铅压电陶瓷样品进行了性能分析与结果讨论。 相似文献
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Lead‐free piezoelectric ceramics are extensively investigated for the alternatives of lead‐based piezoceramics. (K,Na)NbO3 (KNN), (Bi0.5Na0.5)TiO3 (BNT), and (Bi0.5K0.5)TiO3 (BKT)‐based ceramics are reported as promising piezoelectric material families. Several researchers have reported solid solution of these ceramics using various chemical and physical routes. In this study, we have rank these materials using multiple attribute decision making techniques. KNN‐LT‐LS and 0.7BNT‐0.2BKT‐0.1(Bi0.5Li0.5)TiO3 are found to be top rank in all the materials of respective families under study. We have also reported Pareto‐optimal (nondominated) lead‐free piezoelectric ceramics for d33 and Tc parameters. 相似文献
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Wangfeng Bai Lingyu Li Wei Li Bo Shen Jiwei Zhai Haydn Chen 《Journal of the American Ceramic Society》2014,97(11):3510-3518
Lead‐free compounds based on perovskite solid solutions in the ternary system (Bi0.5Na0.5)TiO3‐MeNbO3‐SrTiO3 (BNT‐MeNbO3‐ST, Me=K, Na,(K0.5Na0.5)) were fabricated using a conventional solid‐state reaction method. The effect of ST addition to BNT‐MeNbO3 ceramics on the strain behavior, dielectric, ferroelectric, pyroelectric, and piezoelectric properties was systematically investigated to search the lead‐free piezoelectric materials with an excellent actuating performance. The phase diagrams based on the phase transition temperatures were obtained and the relationship between the phase structure and the electrical properties of the BNT‐MeNbO3‐ST system has been clarified. A qualitative correlation between the morphotropic phase boundary (MPB)composition and tolerance factor t in BNT‐based systems has also been established and the present work indicates that the t value corresponding to the formation of MPB located in a quite narrow range and provides a guideline to predict the approximate MPB region quickly for new solid solutions. The Raman‐spectra analysis, macroscopic properties, and temperature‐dependent relationships of both polarization and strain demonstrated that the large strain response for this investigated system originates from a field‐induced relaxor to ferroelectric phase transformation. 相似文献
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Crystalline phase and electrical properties of lead‐free piezoelectric KNN‐based films with different orientations 下载免费PDF全文
Wen Chen Lingyan Wang Wei Ren Gang Niu Jinyan Zhao Nan Zhang Ming Liu Ye Tian Ming Dong 《Journal of the American Ceramic Society》2017,100(7):2965-2971
Lead‐free piezoelectric 0.915K0.5Na0.5NbO3‐0.075BaZrO3‐0.01Bi0.5Na0.5TiO3 (KNN‐BZ‐BNT) films were grown on Nb‐doped SrTiO3 substrates with different orientations. The thin films show highly preferential orientations in accordance with the orientations of single crystalline substrates. The films all exhibit a weak contrast and remarkable homogeneity in the local static out‐of‐plane piezoresponse phase images, suggesting a strong self‐polarization. Combining with the analysis of XRD‐RSM, TEM and PFM, the crystalline phase of our samples was determined to be rhombohedral, which has the spontaneous polarization along [111] direction. Thus, the (100)‐oriented film demonstrates the most superior piezoelectric properties. Our detailed studies on structural and electrical properties of KNN‐BZ‐BNT films further clarify the structure‐property relationship and make a step closer to use this lead‐free material for many piezoelectric applications. 相似文献
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《Ceramics International》2014,40(6):7947-7951
Lead free (1−x)(0.8Bi0.5Na0.5Ti0.5O3–0.2Bi0.5K0.5TiO3)–xBiZn0.5Ti0.5O3 (x=0–0.06) (BNT–BKT–BZT) thin films were deposited on Pt(111)/Ti/SiO2/Si(100) substrates by a sol–gel processing technique. The effects of BZT content on the structural, dielectric, ferroelectric and piezoelectric properties of the BNT–BKT–BZT thin films were investigated systematically. The BNT–BKT–BZT thin films undergo a transition from ferroelectric to relaxor phase with increasing temperature. The phase transition temperature decreases with the increase of BZT content. The BNT–BKT–BZT thin film with x=0.04 exhibits the best ferroelectric properties (Pmax=40 µC/cm2 and Pr=10 µC/cm2), largest dielectric constant (ε=560) and piezoelectric constant (d33=40 pm/V). This finding demonstrates that the BNT–BKT–BZT thin film has an excellent potential for demanding high piezoelectric properties in lead free films. 相似文献
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Kun Guo Shuting Chen Chee Kiang Ivan Tan Meysam Sharifzadeh Mirshekarloo Kui Yao Francis Eng Hock Tay 《Journal of the American Ceramic Society》2017,100(8):3385-3392
Bismuth sodium titanate (BNT) piezoelectric ceramic coatings with dense morphology and single perovskite phase were fabricated by thermal spray process. The melting and crystallization behaviors of BNT near congruent composition and the effect of excess Bi composition were investigated by analyzing the heating‐melting‐cooling cycle for the application in thermal spray process. Crystal structure and morphology of the thermal sprayed BNT coatings were examined, and their electrical and electromechanical properties were tested. An effective piezoelectric coefficient d33 of 50 pm/V was obtained under substrate clamping, measured with laser scanning method. The findings have shed light on the design of appropriate compositions for achieving high quality lead‐free piezoelectric ceramic coatings by the scalable thermal spray process. 相似文献
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Qi Wang Jun Chen Longlong Fan Huidong Song Wei Gao Yangchun Rong Laijun Liu Liang Fang Xianran Xing 《Journal of the American Ceramic Society》2013,96(12):3793-3797
A new lead‐free BNT‐based piezoelectric ceramics of (1 ? x)Bi0.5Na0.5TiO3–xBi(Al0.5Ga0.5)O3 (x = 0, 0.02, 0.03, 0.04, and 0.05) were synthesized using a conventional ceramic fabrication method. Their structures and electrical properties were investigated. All the samples show a typical ferroelectric P(E) loops and S(E) curves at room temperature. The optimal properties are obtained at the composition of the x = 0.03. The substitution of Bi(Al0.5Ga0.5)O3 enhances piezoelectric constant and increases Curie temperature from 58 pC/N and 310°C of pure BNT to 93 pC/N and 325°C of the x = 0.03. The temperature‐dependent P(E) loops and S(E) curves of 0.97BNT–0.03BAG indicate that phase transition from ferroelectric to antiferroelectric takes place over a very wide temperature region from 80°C to 180°C. The results show that the introduction of BAG improves the electrical properties of BNT. 相似文献