CN106810234A - 一种立方钙钛矿结构单相多铁材料 - Google Patents
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- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- GEYXPJBPASPPLI-UHFFFAOYSA-N manganese(III) oxide Inorganic materials O=[Mn]O[Mn]=O GEYXPJBPASPPLI-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000003746 solid phase reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Abstract
一种立方钙钛矿结构单相多铁材料,涉及新型功能材料领域。立方钙钛矿结构单相多铁材料其化学式为BiMn3Fe4O12,其晶体结构为立方钙钛矿结构,属于立方晶系,空间群为IM‑3,晶胞参数为其磁结构为共线的G型反铁磁构型(即在a、b、c三个方向均为反铁磁耦合),其铁电极化方向为<111>方向,铁电极化值为39~220μC/m2,相比同类材料,其铁电极化值可提高一个数量级以上。
Description
技术领域:
本发明涉及新型功能材料领域,具体涉及一种新型立方钙钛矿结构单相多铁材料BiMn3Fe4O12。
背景技术:
多铁性材料是指同时具有两种或者两种以上基础铁性(铁电性、铁弹性、铁磁性)的物质。多铁性材料中由于铁电性与铁磁性的共存,从而可以实现电场对磁性质的调控或者磁场对电性能的调控,比如电场调控磁畴的翻转,磁矩大小的改变等。多铁材料的这一特殊性质使其成为一种十分具有潜力的新型功能材料,在设计开发新型存储器,传感器方面具有非常大的应用价值。
钙钛矿结构单相多铁材料是多铁家族中的重要成员之一,比如BiMnO3,BiFeO3,其铁电极化主要来源于非磁性离子的位移而磁性则由磁性离子贡献。但是,由于铁电性与铁磁性的来源不同,这类多铁材料中的磁电耦合往往很弱,难以满足实际运用的要求。有研究报道发现,有一些特殊的磁结构可破坏空间反演对称性,从而诱导出铁电极化,而且,在这类材料中,因其铁电性为其磁性诱导产生,即磁性与铁电性之间存在较强耦合作用,因而可获得较大的磁电耦合系数。但在目前发现的磁性诱导铁电性的多铁材料中,其磁结构中磁矩往往表现为非共线排列,而这种源于自旋失措的非共线磁结构在磁性材料中非常稀少,这就从结构上大大制约了这类强磁电耦合多铁材料的设计与开发。与之相反,受到晶体场对称性的约束,磁矩共线排列的磁结构则是广泛存在于大量磁性材料中的一个普遍现象,因此,如果能够通过一定的方法,在具有磁矩共线排列磁结构的材料中实现铁电性,则可大大丰富具有强磁电耦合特征、磁性诱导铁电类多铁材料的种类与数量,对于多铁性材料的设计研发与器件应用意义重大。
发明内容
针对非共线磁序磁性诱导铁电类多铁材料的稀缺,本发明提供一种晶体结构为立方钙钛矿结构,其磁结构具有磁矩共线排列特征的新型单相多铁材料,主要特点为,其铁电性由其磁性诱导产生,而且,其铁电性明显优于已报道其他相似多铁性材料。
本发明所涉及的一种立方钙钛矿结构单相多铁材料,其特征在于,立方钙钛矿结构单相多铁材料其化学式为BiMn3Fe4O12,其晶体结构为立方钙钛矿结构,属于立方晶系,空间群为IM-3,晶胞参数为其磁结构为共线的G型反铁磁构型(即在a、b、c三个方向均为反铁磁耦合),其铁电极化方向为<111>方向,铁电极化值为39~220μC/m2,U值为6eV时,铁电极化值为220μC/m2。相比同类材料,其铁电极化值可提高一个数量级以上。
通过对该类单相多铁性材料的特性研究表明,此类材料铁电性来源于特定不同种类磁性离子之间复杂的相互作用,要实现磁性诱导铁电性,对于两种磁性离子电子态能级与杂化作用有极为严格与特殊的要求,换句话说,不通过特殊的材料成分、结构以及电子结构的设计与调控,仅靠简单的元素替换,无法进行该类多铁材料的研究发明。
附图说明
图1示出了BiMn3Fe4O12的晶体结构图。
图2示出了具有不同磁结构BiMn3Fe4O12的总能随晶胞参数变化曲线。
图3示出了BiMn3Fe4O12的铁电极化值与U值的关系。
具体实施方式
为了使本领域的技术人员更好地理解本发明,下面结合具体的实施例对本发明做进一步说明,但本发明并不限于以下实施例。
实施例1
该材料的制备可通过高压固相反应实现,具体工艺为:a)首先将高纯度的Bi2O3,Mn2O3和Fe2O3(纯度大于99.9%)按照摩尔比例1:3:4充分混合后进行细致研磨,之后用200目的筛子进行筛选。b)将筛选后的原料填入由铂金制成的胶囊型反应容器中并填实,然后将铂金胶囊置于高温高压反应装置中,升压至4~5GPa,在1273K-1373K的温度下反应2小时以上,可获得BiMn3Fe4O12多铁材料。
1)多铁性材料BiMn3Fe4O12,其晶体结构如图1所示。在晶体结构为A位有序的立方钙钛矿结构,分子式为AA’3B4O12的这一类材料体系中,对分子式中的A、A’与B位,在3d过渡族及IV,V族中进行了细致的元素筛选,使得所选A’与B位磁性离子之间满足特定的磁性相互作用,且对A、A’与B位所选离子之间的杂化作用进行调控。
2)为了实现多铁性,对其磁结构进行了设计,并通过总能计算证明多铁性材料BiMn3Fe4O12的磁结构在满足诱导铁电性产生的前提下,同时也是该材料的基态,以保证该材料的易于获得与制备。如图2所示,BiMn3Fe4O12能量最低的磁结构为G型反铁磁结构,且其晶格常数为
3)研究表明,通过对材料中电子间库伦作用对磁性离子中电子-轨道耦合作用的调控,可以实现对其铁电性的调控与优化,这为该类单相多铁性材料设计与性能优化提供了一种可行的方法。结果如图3所示,BiMn3Fe4O12的电极化方向为<111>晶向,基于不同强度的库伦作用,其铁电极化强度可为39~220μC/m2。
Claims (4)
1.一种立方钙钛矿结构单相多铁材料,其特征在于,立方钙钛矿结构单相多铁材料其化学式为BiMn3Fe4O12。
2.按照权利要求1所述的一种立方钙钛矿结构单相多铁材料,其特征在于,晶体结构为立方钙钛矿结构,属于立方晶系,空间群为IM-3,晶胞参数为其磁结构为共线的G型反铁磁构型即在a、b、c三个方向均为反铁磁耦合,其铁电极化方向为<111>方向。
3.按照权利要求2所述的一种立方钙钛矿结构单相多铁材料,其特征在于,铁电极化值为39~220μC/m2。
4.按照权利要求2所述的一种立方钙钛矿结构单相多铁材料,其特征在于,U值为6eV时,铁电极化值为220μC/m2。
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CN101255053A (zh) * | 2008-04-08 | 2008-09-03 | 同济大学 | 高温单相亚铁磁-铁电多重铁性陶瓷材料及其制备方法 |
CN101734731A (zh) * | 2009-12-14 | 2010-06-16 | 北京航空航天大学 | 一种具有低电阻温度系数的反钙钛矿类材料及其制备方法 |
CN101998934A (zh) * | 2008-10-02 | 2011-03-30 | 首尔大学校产学协力团 | 多铁性材料及其制造方法 |
CN104671755A (zh) * | 2015-02-10 | 2015-06-03 | 中国科学院物理研究所 | 一种新型磁电耦合多铁性材料BiMn3Cr4O12的制备方法 |
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WO2007060757A1 (ja) * | 2005-11-25 | 2007-05-31 | Hitachi Metals, Ltd. | 酸化物磁性材料及びその製造方法、並びにフェライト焼結磁石及びその製造方法 |
CN101255053A (zh) * | 2008-04-08 | 2008-09-03 | 同济大学 | 高温单相亚铁磁-铁电多重铁性陶瓷材料及其制备方法 |
CN101998934A (zh) * | 2008-10-02 | 2011-03-30 | 首尔大学校产学协力团 | 多铁性材料及其制造方法 |
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CN113398909A (zh) * | 2021-06-08 | 2021-09-17 | 中国科学院物理研究所 | 钙钛矿材料及其制备方法和应用 |
CN113398909B (zh) * | 2021-06-08 | 2022-05-24 | 中国科学院物理研究所 | 钙钛矿材料及其制备方法和应用 |
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