本文選題：無鉛壓電材料 + 場(chǎng)致應(yīng)變　； 參考：《上海師范大學(xué)》2015年碩士論文

【摘要】：半個(gè)多世紀(jì)以來,鋯鈦酸鉛(PZT)基壓電材料憑借其優(yōu)異的壓電與機(jī)電耦合性能,在驅(qū)動(dòng)器、換能器、傳感器等領(lǐng)域一直占據(jù)著主導(dǎo)地位。但由于PZT高的鉛含量,對(duì)人體與環(huán)境構(gòu)成巨大危害,發(fā)展新型的無鉛壓電材料來替代或部分替換傳統(tǒng)鉛基壓電材料成為近些年來國內(nèi)外研究熱點(diǎn)之一。研究結(jié)果表明,(1-x)Bi0.5Na0.5Ti O3-x Ba Ti O3(BNT-BT,BNT-x BT)基壓電材料在準(zhǔn)同型相界(MPB)附近具有良好的壓電性能,圍繞MPB組分的BNT-BT進(jìn)一步發(fā)展具有高場(chǎng)致應(yīng)變無鉛壓電體系,引起了廣泛的研究興趣。第一原理計(jì)算表明,Bi(Zn0.5Ti0.5)O3(BZT)和Zn Sn O3(ZS)作為新型的無鉛材料體系,理論上具有優(yōu)良的鐵電性能,由于純BZT和ZS用常規(guī)方法難于合成,探索其它途徑從實(shí)驗(yàn)上獲得這些新的無鉛材料體系具有重要意義。本論文中將這些第一原理計(jì)算的體系與現(xiàn)有的高性能無鉛體系進(jìn)行復(fù)合,通過制備固溶體的方法來得到具有純的相結(jié)構(gòu)的新材料體系,如將BZT與二元Bi0.5Na0.5Ti O3-Ba Ti O3(BNT-BT)進(jìn)行復(fù)合,制備了BNT-BT-BZT(BNT-BTx BZT)固溶體系;將ZS與Ba Ti O3復(fù)合,制備了BT-ZS二元固溶體體系。研究結(jié)果表明,BNT-BT-BZT固溶體系均形成純的鈣鈦礦結(jié)構(gòu),BZT的引入誘導(dǎo)了室溫附近的相結(jié)構(gòu)由鐵電四方相向贗立方轉(zhuǎn)變,同時(shí)伴隨著大的場(chǎng)致應(yīng)變,BZT濃度為5%mol時(shí),體系在室溫相對(duì)較低的電場(chǎng)強(qiáng)度下(4 k V/mm),獲得的場(chǎng)致應(yīng)變?yōu)?.23%,相應(yīng)的等效壓電系數(shù)(Smax/Emax)達(dá)到526 pm/V,顯著地高于當(dāng)前主要的BNT基無鉛材料,場(chǎng)致應(yīng)變?cè)?5-120 oC范圍內(nèi)表現(xiàn)出良好的穩(wěn)定性。另外,該體系表現(xiàn)出極好的抗疲勞性,表明該三元固溶體系非常適合環(huán)境友好型驅(qū)動(dòng)器的應(yīng)用。BT-ZS固溶體系在x=0-0.10組分范圍內(nèi)均可形成純的鈣鈦礦結(jié)構(gòu),ZS的引入誘導(dǎo)了室溫附近的相結(jié)構(gòu)由鐵電四方相向立方相轉(zhuǎn)變,伴隨著大的電致伸縮響應(yīng)。ZS濃度為10%mol時(shí),體系在室溫電場(chǎng)強(qiáng)度為4 k V/mm條件下,電致伸縮系數(shù)Q達(dá)到0.0452 m4C-2,優(yōu)于傳統(tǒng)的電致伸縮材料體系Pb(Mg1/3Nb2/3)O3,并且在25-120 oC表現(xiàn)出良好的穩(wěn)定性,非常適合固態(tài)驅(qū)動(dòng)器與執(zhí)行器的應(yīng)用。
[Abstract]:For more than half a century, lead zirconate titanate PZT-based piezoelectric materials have been playing a leading role in the fields of actuators, transducers and sensors because of their excellent piezoelectric and electromechanical coupling properties. However, due to the high lead content of PZT, it is a great harm to human body and environment, so the development of new lead-free piezoelectric materials to replace or partially replace the traditional lead-based piezoelectric materials has become one of the research hotspots at home and abroad in recent years. The results show that the piezoelectric properties of BNT-BTX BNT-BT3BNT-BNT-x based piezoelectric materials are good near the quasi-homogenous phase boundary. The further development of BNT-BT with high field-induced strain and lead-free piezoelectric system around the MPB component has attracted extensive interest. The results show that the piezoelectric materials based on the 1-xHX Bi0.5Na0.5TiO3-x BaTiO3- BNT-BTB-based materials have good piezoelectric properties near the quasi-homogenous phase boundary. The further development of the BNT-BT based on the MPB component has attracted extensive interest. The first principle calculation shows that Bi-Zn _ (0.5) Ti _ (0.5) O _ (3) BZT) and Zn _ Sn _ (3) O _ (3) ZS), as new lead-free materials, have excellent ferroelectric properties in theory. It is difficult to synthesize pure BZT and ZS by conventional methods. It is of great significance to explore other ways to obtain these new lead-free materials experimentally. In this paper, the first principle calculation system is combined with the existing high performance lead-free system, and a new material system with pure phase structure is obtained by preparing solid solution, such as BZT and binary Bi0.5Na0.5Ti O3-Ba TIO _ 3 BNT-BTs. The BNT-BT-BZT(BNT-BTx BZT solution system was prepared, and the BT-ZS binary solid solution system was prepared by combining ZS with BaTiO3. The results show that the introduction of pure perovskite structure in BNT-BT-BZT solid solution system induces the transition of phase structure near room temperature from ferroelectric tetragonal to pseudo-cubic, and at the same time, with the large field-induced strain and the concentration of 5%mol. When the electric field intensity of the system is relatively low at room temperature, the field-induced strain is 0.23, and the corresponding equivalent piezoelectric coefficient (S _ max / E _ max) is 526 pm / V, which is significantly higher than that of the main BNT based lead-free materials at present. The field-induced strain shows good stability in the range of 25-120 oC. In addition, the system shows excellent fatigue resistance, It is shown that the ternary solid solution system is very suitable for the application of environment-friendly actuator. The introduction of pure perovskite structure can be formed in the range of x ~ (0-0.10). The introduction of ZS induces the phase structure transition from ferroelectric tetragonal phase to cubic phase near room temperature. When the concentration of ZS is 10%mol, the electrostrictive coefficient Q is 0.0452 m4C-2 when the electric field intensity is 4 k V/mm at room temperature, which is superior to that of the traditional electrostrictive material system (PbmMg1 / 3Nb2 / 3Nb2 / 3O3), and shows good stability at 25-120oC. Very suitable for solid-state actuators and actuators.
【學(xué)位授予單位】：上海師范大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ134.33

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