掺杂改性对BCZT基无铅压电陶瓷组织和性能的影响

发布时间：2018-08-06 17:34

【摘要】：压电陶瓷材料因具有机械能—电能相互转化的性能,被广泛地应用在航空航天、医疗、生活艺术等各领域。无铅压电陶瓷由于不含铅、不污染环境,符合人类社会可持续发展的要求,因而备受产业界和研究人员的青睐。为了提高BCZT压电陶瓷的居里温度Tc,获得电性能更优的压电陶瓷,本文采用掺杂Sb_2O_3、Bi_2O_3以及BKT材料对BCZT进行改性研究,运用SEM、XRD、拉曼检测、TEM、压电性能测试等手段研究了离子掺杂对BCZT基无铅压电陶瓷显微组织、相结构和电学性能的影响,主要研究结果如下:(1)针对(Ba_0.85Ca_0.15)(Ti_0.9Zr_0.08Sn_0.02)O_3-xSb_2O_3(x=0,0.02,0.04,0.06,0.08wt.%)体系,探讨了不同Sb~(3+)掺杂量对BCZTS陶瓷显微物相结构、组织形貌和电性能的影响。结果表明,不同掺杂量得到的组分均表现出纯的钙钛矿结构,Sb~(3+)完全固溶于BCZTS陶瓷主晶相结构中。未掺杂Sb~(3+)的居里温度为78℃[1],掺杂Sb~(3+)后的最高居里温度为102℃。当x=0.04 wt.%时,BCZTS-xSb陶瓷拥有最优的电学性能:d_33=392pC/N,K_p=61%,ε_r~4830,tan_δ~2.44%,T_c=102 ℃。(2)针对Ba_0.85Ca_0.15Zr_0.07Ti_0.93O_(3-x) Bi_2O_3(x=0,0.02,0.04,0.06wt.%)体系,探讨了不同Bi~(3+)掺杂量对BCZT陶瓷相结构、压电性能和介电性能等的影响。结果表明,陶瓷试样的不同组分都生成了纯的钙钛矿结构,且随着Bi~(3+)掺杂量的增加,陶瓷试样的相结构没有较大变化。当x=0.06wt.%时,陶瓷具有最好的介电性能,ε_r=5100,tan_δ=1.2%。当x=0wt.%时,陶瓷试样拥有最好的压电性能,d_33=386pC/N,K_p=45%,当x=0.02wt.%时,居里温度最高,T_c=103 ℃。(3)对于(1-x)(Ba_0.85Ca_0.15)(Ti_0.93Zr_0.07)O_(3-x)(Bi_0.5K_0.5)TiO_3(x=0.02,0.04,0.06,0.08 mol)体系,研究了不同BKT掺杂量对BCZT陶瓷显微组织、相结构和电学性能的影响。结果表明,掺杂BKT后的陶瓷均形成了纯的钙钛矿结构,且当x=0.04mol时,试样显微组织最均匀,致密度最高。随着x的变大,d_33和K_p首先都提升随后有所降低。当x=0.04 mol时,(1-x)BCZT-xBKT陶瓷拥有最佳的电学性能:d_33=342 pC/N,K_p=57%,ε_r~3319,tan_δ~2.32%,T_c=103 ℃。
[Abstract]:Piezoelectric ceramic materials have been widely used in aerospace, medical treatment, life art and other fields because of their mechanical energy and electrical energy conversion. Lead-free piezoelectric ceramics are favored by industry and researchers because they do not contain lead, do not pollute the environment and meet the requirements of sustainable development of human society. In order to improve the Curie temperature (Tc) of BCZT piezoelectric ceramics and obtain piezoelectric ceramics with better electrical properties, the modification of BCZT by doping SB _ 2O _ 3 and BKT materials has been studied in this paper. The effects of ion doping on the microstructure, phase structure and electrical properties of BCZT based lead-free piezoelectric ceramics were studied by means of BCZT XRD, Raman Tem and piezoelectric properties. The main results are as follows: (1) for the (Ba_0.85Ca_0.15) (Ti_0.9Zr_0.08Sn_0.02) O_3-xSb_2O_3 (x0 / 0 / 0. 02 / 0. 020 / 0. 040 ~ 0. 08wt.%) system, the effect of ion doping on the microstructure, phase structure and electrical properties of lead-free piezoelectric ceramics based on BCZT was studied. The main results are as follows: (1) for the system of (Ba_0.85Ca_0.15) (Ti_0.9Zr_0.08Sn_0.02), The effects of different doping amount of SB ~ (3) on the phase structure, microstructure and electrical properties of BCZTS ceramics were investigated. The results show that the pure perovskite structure and SB ~ (3) are completely dissolved in the main crystal structure of BCZTS ceramics. The Curie temperature of undoped SB ~ (3) is 78 鈩，

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