钛酸铋钠基无铅压电陶瓷的制备与改性分析-(6217)

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1、西北工业大学工程硕士专业学位论文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万方数据论文的主要创新与贡献论文的主要创新与贡献(1)通过B位取代、多元复合等成分调控，制备了(

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压电材料。分别获得了具有大剩余极化6强度以及高机械品质因数的锰掺杂钛酸铋钠陶瓷；极化10次后无疲劳材料Bi0.5Na0.5(Mn0.5Nb0.5)xTi1-xO3以及可在低电场下应用的具有大应变的无铅压电陶瓷材料(1−x)B