元素摻雜調(diào)控BiFeO3基多層薄膜的多鐵性能研究

元素摻雜調(diào)控BiFeO3基多層薄膜的多鐵性能研究元素摻雜調(diào)控BiFeO3基多層薄膜的多鐵性能研究

摘要：

多鐵材料由于其獨特的多功能性質(zhì)，成為材料科學研究的熱門課題。在多鐵材料中，BiFeO3因其較高的居里溫度和優(yōu)異的多鐵性能而受到廣泛關(guān)注。然而，BiFeO3基多層薄膜的應(yīng)用還受到其固有的弱多鐵性和應(yīng)力效應(yīng)的限制。為了進一步優(yōu)化BiFeO3基多層薄膜的多鐵特性，元素摻雜技術(shù)被引入。

本研究通過采用化學溶液法在BiFeO3基多層薄膜中引入La和Mn元素進行摻雜，并研究了摻雜對多鐵性能的影響。實驗結(jié)果表明，La摻雜可以顯著增強BiFeO3基多層薄膜的鐵電性能。通過摻雜La元素，晶格結(jié)構(gòu)發(fā)生了改變，導致晶格常數(shù)增大和晶體畸變減小，從而提高了鐵電性能。此外，La摻雜還增強了薄膜的磁性能，使其成為一種誘導鐵磁性的材料。而Mn摻雜則可以提高薄膜的磁性能，使其具有更強的鐵磁性。

為了進一步研究多鐵性能，我們還研究了摻雜量和摻雜濃度對薄膜性能的影響。實驗結(jié)果表明，隨著摻雜量的增加，薄膜的鐵電和磁性能均得到了顯著提高，但過高的摻雜量可能導致晶格結(jié)構(gòu)的破壞和其他不良效應(yīng)的出現(xiàn)。因此，合理控制摻雜量和摻雜濃度是優(yōu)化多鐵性能的關(guān)鍵。

此外，應(yīng)力效應(yīng)也對BiFeO3基多層薄膜的多鐵性能有重要影響。在本研究中，我們通過控制薄膜的厚度和襯底材料來調(diào)節(jié)應(yīng)力效應(yīng)。實驗結(jié)果表明，在合適的應(yīng)力條件下，BiFeO3基多層薄膜的多鐵性能得到了顯著增強。然而，不適當?shù)膽?yīng)力條件可能導致薄膜的失配和裂紋的產(chǎn)生，從而影響薄膜的多鐵性能。

綜上所述，通過元素摻雜調(diào)控BiFeO3基多層薄膜的多鐵性能是一項具有重要意義的研究。本研究通過引入La和Mn元素進行摻雜，并研究了摻雜量、摻雜濃度和應(yīng)力效應(yīng)對薄膜性能的影響。實驗結(jié)果表明，元素摻雜可以顯著增強薄膜的多鐵性能，同時合理控制摻雜量和應(yīng)力條件是優(yōu)化多鐵性能的關(guān)鍵。這些研究可以為多鐵材料的設(shè)計和應(yīng)用提供新思路和理論支持。

關(guān)鍵詞：元素摻雜；BiFeO3基多層薄膜；多鐵性能；應(yīng)力效應(yīng)；優(yōu)化

Abstract:

Multiferroicmaterialshaveattractedmuchattentionduetotheiruniquemultifunctionalproperties.Amongmultiferroicmaterials,BiFeO3hasbeenwidelystudiedforitshighCurietemperatureandexcellentmultiferroicproperties.However,theapplicationofBiFeO3-basedmultilayerfilmsisstilllimitedbyitsinherentweakmultiferroicityandstresseffects.InordertofurtheroptimizethemultiferroicpropertiesofBiFeO3-basedmultilayerfilms,thetechniqueofelementdopingisintroduced.

Inthisstudy,LaandMnelementsweredopedintoBiFeO3-basedmultilayerfilmsusingthechemicalsolutionmethod,andtheinfluenceofdopingonthemultiferroicpropertieswasinvestigated.TheexperimentalresultsshowthatLadopingcansignificantlyenhancetheferroelectricperformanceofBiFeO3-basedmultilayerfilms.TheintroductionofLaelementschangesthelatticestructureandleadstoanincreaseinlatticeconstantandadecreaseincrystaldistortion,therebyimprovingtheferroelectricperformance.Inaddition,Ladopingalsoenhancesthemagneticperformanceofthefilms,makingitaninducedferromagneticmaterial.Mndoping,ontheotherhand,canimprovethemagneticperformanceofthefilms,givingthemstrongerferromagneticproperties.

Tofurtherstudythemultiferroicproperties,wealsoinvestigatedtheinfluenceofdopingamountanddopingconcentrationonthefilmproperties.Theexperimentalresultsshowthatwiththeincreaseofdopingamount,boththeferroelectricandmagneticpropertiesofthefilmsaresignificantlyimproved,butexcessivedopingamountmaycauselatticestructuredamageandtheoccurrenceofotheradverseeffects.Therefore,controllingthedopingamountandconcentrationiscrucialforoptimizingthemultiferroicproperties.

Inaddition,stresseffectsalsoplayanimportantroleinthemultiferroicpropertiesofBiFeO3-basedmultilayerfilms.Inthisstudy,thestresseffectwasadjustedbycontrollingthethicknessofthefilmsandthesubstratematerial.Theexperimentalresultsshowthatunderappropriatestressconditions,themultiferroicpropertiesofBiFeO3-basedmultilayerfilmsaresignificantlyenhanced.However,inappropriatestressconditionsmaycausefilmmismatchandcracking,thusaffectingthemultiferroicpropertiesofthefilms.

Inconclusion,theresearchonthecontrolofmultiferroicpropertiesofBiFeO3-basedmultilayerfilmsthroughelementdopingisofgreatsignificance.Inthisstudy,LaandMnelementsweredoped,andtheinfluenceofdopingamount,dopingconcentration,andstresseffectsonthefilmpropertieswasstudied.Theexperimentalresultsshowthatelementdopingcansignificantlyenhancethemultiferroicpropertiesofthefilms,andcontrollingthedopingamountandstressconditionsisthekeytooptimizingthemultiferroicproperties.Thesestudiescanprovidenewideasandtheoreticalsupportforthedesignandapplicationofmultiferroicmaterials.

Keywords:elementdoping;BiFeO3-basedmultilayerfilms;multiferroicproperties;stresseffects;optimizatio綜合研究