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首页> 外文期刊>Advanced Functional Materials >The Polar/Antipolar Phase Boundary of BiMnO_3-BiFeO_3- PbTiO_3: Interplay among Crystal Structure, Point Defects, and Multiferroism
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The Polar/Antipolar Phase Boundary of BiMnO_3-BiFeO_3- PbTiO_3: Interplay among Crystal Structure, Point Defects, and Multiferroism

机译：BiMnO_3-BiFeO_3- PbTiO_3的极性/反极性相界：晶体结构，点缺陷和多铁性之间的相互作用

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摘要

The ferromagnetic perovskite oxide BiMnO3 is a highly topical material, and the solid solutions it forms with antiferromagnetic/ferroelectric BiFeO3 and with ferroelectric PbTiO3 result in distinctive polaronpolar morphotropic phase boundaries (MPBs). The exploitation of such a type of MPBs could be a novel approach to engineer novel multiferroics with phase-change magnetoelectric responses, in addition to ferroelectrics with enhanced electromechanical performance. Here, the interplay among crystal structure, point defects, and multiferroic properties of the BiMnO3-BiFeO3-PbTiO3 ternary system at its line of MPBs between polymorphs of tetragonal P4mm (polar) and orthorhombic Pnma (antipolar) symmetries is reported. A strong dependence of the phase coexistence on thermal history is found: phase percentage significantly changes whether the material is quenched or slowly cooled from high temperature. The origin of this phenomenon is investigated with temperature-dependent structural and physical property characterizations. A major role of the complex defect chemistry, where a Bi/Pb-deficiency allows Mn and Fe ions to have a mixed-valence state, in the delicate balance between polymorphs is proposed, and its influence in the magnetic and electric ferroic orders is defined.
机译：铁磁钙钛矿氧化物BiMnO3是一种非常热门的材料，它与反铁磁/铁电BiFeO3和铁电PbTiO3形成的固溶体导致独特的极性/非极性同相相界（MPB）。除了具有增强的机电性能的铁电体之外，这种类型的MPB的开发可能是一种设计具有相变磁电响应的新型多铁体的新颖方法。在这里，BiMnO3-BiFeO3-PbTiO3三元系的晶体结构，点缺陷和多铁性之间的相互作用据报道在四方P4mm（极性）和正交Pnma（反极性）对称多晶型物的MPB线上。发现相共存对热历史的强烈依赖性：相百分比显着改变了材料是淬火还是从高温缓慢冷却。通过与温度相关的结构和物理特性表征研究了这种现象的起源。提出了一种复杂缺陷化学的主要作用，即Bi / Pb缺陷使Mn和Fe离子具有混合价态，从而影响了多晶型之间的微妙平衡，并定义了其对磁和铁铁序的影响。

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