本文選題：鈦酸鋇　切入點(diǎn)：無鉛壓電陶瓷　出處：《北京科技大學(xué)》2015年博士論文　論文類型：學(xué)位論文

【摘要】：BaTiO3陶瓷是一種重要的功能材料。近年來,由于其壓電性能取得了重大突破(d33=620pC/N),受到研究者們的廣泛關(guān)注。然而,目前圍繞高性能BaTiO3體系的研究仍然處于起步階段。通過優(yōu)化取代元素種類以及取代量,有望拓寬BaTiO3基無鉛壓電陶瓷的成分體系,獲得多種高性能的新型BaTiO3基無鉛壓電陶瓷。本文擬通過組元優(yōu)化以及相結(jié)構(gòu)調(diào)控的方法,制備高性能BaTiO3基無鉛壓電陶瓷,深入研究組元含量的變化與陶瓷樣品的相結(jié)構(gòu)和電學(xué)性能的關(guān)聯(lián),并揭示性能的增強(qiáng)機(jī)理。 研究了Ca含量對(Ba,Ca)TiO3-0.04LiF基陶瓷相結(jié)構(gòu)和電學(xué)性能的影響。隨著Ca含量的增加,陶瓷樣品的相結(jié)構(gòu)由正交(O)相轉(zhuǎn)變成贗立方(PC)相,且在Ca含量為0.02時,陶瓷樣品具有O和PC兩相共存,并獲得了優(yōu)異的電學(xué)性能d33=361pC/N和kp=0.412。 系統(tǒng)研究了(Ba,Ca)(Ti,Sn)O3基無鉛壓電陶瓷中各組元含量的變化對其相結(jié)構(gòu)和電學(xué)性能的影響。通過調(diào)節(jié)各組元的相對比例,調(diào)控陶瓷樣品的相結(jié)構(gòu),明晰了該體系的兩相或多相共存成分區(qū)域,并分析兩相或多相共存的相結(jié)構(gòu)對陶瓷樣品的壓電、鐵電和介電性能及電致應(yīng)變的影響,揭示其性能增強(qiáng)機(jī)理。歸納出(Ba,Ca)(Ti,Sn)O3多元體系中關(guān)鍵區(qū)域的相圖,并揭示了各組元含量的變化與相結(jié)構(gòu)和電學(xué)性能的關(guān)聯(lián)。研究發(fā)現(xiàn)：(Ba0.95Ca0.05)(Ti1-xSnx)O3陶瓷樣品在χ=0.11時取得了高的壓電性能d33=670pC/N,且在較寬的組分區(qū)域0.07≤x≤0.11內(nèi)壓電性能d33_500pC/N。此外,在BaTiO3-x(0.4CariO3-0.6BaSnO3)體系中,陶瓷樣品取得了高的電致應(yīng)變0.07%和逆壓電系數(shù)d33*＝1444pm/V。研究結(jié)果表明：(Ba,Ca)(Ti,Sn)O3陶瓷是一種有前景的無鉛壓電陶瓷體系。 系統(tǒng)研究了高居里溫度(0.7-x)BiFeO3-0.3BaTiO3-xBi(Mg1/2Ti1/2)O3體系中各組元含量的變化對其相結(jié)構(gòu)和電學(xué)性能的影響。通過調(diào)節(jié)各組元的相對含量,調(diào)控陶瓷樣品的相結(jié)構(gòu),使陶瓷樣品在室溫下具有R-PC兩相共存,從而有效地增強(qiáng)其壓電性能。研究發(fā)現(xiàn)：由于R-PC兩相共存,陶瓷樣品在χ=0.04時取得高的壓電活性d33=154pC/N和居里溫度TC=482℃,該結(jié)果表明BiFeO3-BaTiO3-Bi(Mg1/2Ti1/2)O3體系在高溫壓電裝置領(lǐng)域具有良好的應(yīng)用前景。
[Abstract]:BaTiO3 ceramics are one of the important functional materials. In recent years, the piezoelectric properties of BaTiO3 ceramics have made a great breakthrough, which has attracted wide attention of researchers. At present, the research on high performance BaTiO3 system is still in its infancy. By optimizing the type and quantity of substituted elements, it is expected to broaden the composition system of lead-free piezoelectric ceramics based on BaTiO3. A variety of novel lead-free piezoelectric ceramics based on BaTiO3 with high performance were obtained. In this paper, BaTiO3 based lead-free piezoelectric ceramics with high performance were prepared by means of component optimization and phase structure control. The relationship between the change of element content and the phase structure and electrical properties of ceramic samples was studied, and the enhancement mechanism of the properties was revealed. The effect of Ca content on the phase structure and electrical properties of Baancao TiO3-0.04LiF-based ceramics was studied. With the increase of Ca content, the phase structure of the ceramics changed from orthogonal phase to pseudo-cubic PC-phase, and when the Ca content was 0.02, the phase structure of the ceramics changed from the orthogonal phase to the pseudo-cubic phase. The ceramic samples have two phases, O and PC, and the excellent electrical properties of d33=361pC/N and KPA 0.412 have been obtained. The effect of the content of each component on the phase structure and electrical properties of the lead-free piezoelectric ceramics based on Bajiangcao TiZO 3 was systematically studied. The phase structure of the ceramic samples was regulated by adjusting the relative proportion of the components. The region of the two-phase or multi-phase coexisting components of the system is clarified, and the effect of the two-or multi-phase coexisting phase structure on the piezoelectric, ferroelectric and dielectric properties and the electrically induced strain of the ceramic sample is analyzed. The mechanism of performance enhancement is revealed, and the phase diagrams of the key regions in the multicomponent system are summarized. The relationship between phase structure and electrical properties was also revealed. It was found that the high piezoelectric properties of Ti _ (1-x) Sn _ (x) O _ (3) ceramic samples were obtained at 蠂 ~ (0.11), and the piezoelectric properties d _ 33500 PC _ (r / N) were obtained in a wide component region of 0.07 鈮，

本文編號：1649768