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《鈦酸鉍鈉基無鉛壓電陶瓷的制備與改性分析-(6217)》由會員上傳分享，免費在線閱讀，更多相關內(nèi)容在行業(yè)資料-天天文庫。
1、西北工業(yè)大學工程碩士專業(yè)學位論文4+3+localizedelectronsandtheinhibitedofreductionofTitoTi,whichshouldberesponsiblefortheincreaseofTcandTd.Theferroelectricpropertiesandfield-inducedstrainswerebothimprovedbyMn-acceptorand(Mn0.5Nb0.5)substitutionatBsite.Thefatigue-resistantpropertiesofBNT-Nbceramicswerecompara
2、bletoBNTceramics,BNT-Mnceramicswerefoundtohavesignificantlyimprovedfatigue-resistantproperties,whilealmostnoprofoundfatiguewas6observedinBNT-MnNbceramicsafterswitchingover10cyclesatroomtemperature.Finally,theperovskiteoxide(1?x)Bi0.5(Na0.9K0.1)0.5TiO3–xSrTi0.8Zr0.2O3(SZT1000x,x=0,0.2%,0.4%,
3、0.6%,0.8%,1%)werepreparedviatheconventionalsolidstatereactionmethod.Theroom-temperatureferroelectricP–EloopscoordinatewithpolarizationcurrentdensityJ–Ecurvesexhaustivelyillustratedthechangesofferroelectricdomainsandpolarnanoregions(PNRs)underdifferentdrivingfield.Theoriginofthelargestrainis
4、duetothepresenceofanonpolarphaseatazerofieldthatcaneasilytransformintoalong-rangeferroelectricphaseupontheapplicationofanelectricfieldandbringsthesystembacktoitsunpoledstateoncetheappliedelectricfieldisremoved.Thecompositionandelectricfielddependentstrainbehaviorofthissystemwereinvestigated
5、todevelopalead-freepiezoelectricmaterialwithalargestrainresponseatalowerelectricfield.Alargestrainof0.44%(Smax/Emax=744pm/V)atanappliedfieldof50kV/cmwasobtainedatthecompositionof0.6%molSZT.Notably,theelectricfieldrequiredtodeliverlargestrainswasreducedto40kV/cmwhiletheSmax/Emaxreachedupto71
6、7pm/V,indicatingthatthedevelopedmaterialishighlypromisingforactuatorapplications.Keywords：BNT-basedceramics;Rietveldrefinement;ferroelectricproperty;piezoelectricproperty;fatigue-resistantcharacteristic;oxygenvacancyconcentration;resistivityIV萬方數(shù)據(jù)論文的主要創(chuàng)新與貢獻論文的主要創(chuàng)新與貢獻(1)通過B位取代、多元復合等成分調(diào)控，制備了(
7、Bi0.5Na0.5)Ti1-xMnxO4-δ，Bi0.5Na0.5MnxTi1-xO3、Bi0.5Na0.5NbxTi1-xO3、Bi0.5Na0.5(Mn0.5Nb0.5)xTi1-xO3以及(1?x)Bi0.5(Na0.9K0.1)0.5TiO3–xSrTi0.8Zr0.2O3壓電材料。分別獲得了具有大剩余極化6強度以及高機械品質(zhì)因數(shù)的錳摻雜鈦酸鉍鈉陶瓷；極化10次后無疲勞材料Bi0.5Na0.5(Mn0.5Nb0.5)xTi1-xO3以及可在低電場下應用的具有大應變的無鉛壓電陶瓷材料(1?x)B
