Controlling Phase Assemblage in a Complex Multi-Cation System: Phase-Pure Room Temperature Multiferroic (1-x)BiTi(1-y)/2FeyMg(1-y)/2O3-xCaTiO3

Mandal Pranab; Pitcher Michael J.; Alaria Jonathan; Niu Hongjun; Zanella Marco; Claridge John B.; Rosseinsky Matthew J.

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Controlling Phase Assemblage in a Complex Multi-Cation System: Phase-Pure Room Temperature Multiferroic (1-x)BiTi(1-y)/2FeyMg(1-y)/2O3-xCaTiO3

机译：在复杂的多阳离子系统中控制相组装：纯相室温多铁（1-x）BiTi（1-y）/ 2FeyMg（1-y）/ 2O3-xCaTiO3

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A room temperature magnetoelectric multiferroic is of interest as, e.g., magnetoelectric random access memory. Bulk samples of the perovskite (1-x)BiTi(1-y)/2FeyMg(1-y)/2O3-xCaTiO3 (BTFM-CTO) are simultaneously ferroelectric, weakly ferromagnetic, and magnetoelectric at room temperature. In BTFM-CTO, the volatility of bismuth oxide, and the complex subsolidus reaction kinetics, cause the formation of a microscopic amount of ferrimagnetic spinel impurity, which complicates the quantitative characterization of their intrinsic magnetic and magnetoelectric properties. Here, a controlled synthesis route to single-phase bulk samples of BTFM-CTO is devised and their intrinsic properties are determined. For example, the composition x = 0.15, y = 0.75 shows a saturated magnetization of 0.0097 mu(B) per Fe, a linear magnetoelectric susceptibility of 0.19(1) ps m(-1), and a polarization of 66 mu C cm(-2) at room temperature. The onset of weak ferromagnetism and linear magnetoelectric coupling are shown to coincide with the onset of bulk long-range magnetic order by neutron diffraction. The synthesis strategy developed here will be invaluable as the phase diagram of BTFM-CTO is explored further, and as an example for the synthesis of other compositionally complex BiFeO3-related materials.

机译：室温磁电多铁是令人感兴趣的，例如，磁电随机存取存储器。钙钛矿（1-x）BiTi（1-y）/ 2FeyMg（1-y）/ 2O3-xCaTiO3（BTFM-CTO）的大量样品在室温下同时是铁电的，弱铁磁的和磁电的。在BTFM-CTO中，氧化铋的挥发性以及复杂的固相线反应动力学导致形成微量的亚铁尖晶石杂质，这使它们固有的磁和磁电性质的定量表征变得复杂。在这里，设计了一种可控制的合成路线，以合成BTFM-CTO的单相大块样品，并确定了它们的固有性质。例如，组成x = 0.15，y = 0.75表示每Fe的饱和磁化强度为0.0097 mu（B），线性磁电磁化率为0.19（1）ps m（-1），极化度为66μC cm（ -2）在室温下。通过中子衍射显示出弱铁磁性和线性磁电耦合的发生与整体长距离磁阶的发生相一致。随着进一步探索BTFM-CTO的相图，并作为合成其他成分复杂的BiFeO3相关材料的实例，此处开发的合成策略将具有无价的价值。

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《Advanced Functional Materials》 |2016年第15期|2523-2531|共9页
作者
Mandal Pranab; Pitcher Michael J.; Alaria Jonathan; Niu Hongjun; Zanella Marco; Claridge John B.; Rosseinsky Matthew J.;
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Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England;

Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England;

Univ Liverpool, Dept Phys, Liverpool L69 7ZE, Merseyside, England;

Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England;

Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England;

Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England;

Univ Liverpool, Dept Chem, Liverpool L69 7ZD, Merseyside, England;

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Controlling Phase Assemblage in a Complex Multi-Cation System: Phase-Pure Room Temperature Multiferroic (1-x)BiTi(1-y)/2FeyMg(1-y)/2O3-xCaTiO3

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