Controlling Phase Assemblage in a Complex Multi‐Cation System: Phase‐Pure Room Temperature Multiferroic (1−x)BiTi(1−y)/2FeyMg(1−y)/2O3–xCaTiO3
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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DOI：
10.1002/adfm.201504911
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发表时间：
2016-04
影响因子：
19
通讯作者：
P. Mandal;M. J. Pitcher;J. Alaria;H. Niu;M. Zanella;J. Claridge;M. Rosseinsky
中科院分区：
文献类型：
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作者：
P. Mandal;M. J. Pitcher;J. Alaria;H. Niu;M. Zanella;J. Claridge;M. Rosseinsky
室温磁电多铁性是令人感兴趣的，例如，磁电随机存取存储器钙钛矿（1−x）BiTi（1−y）/2FeyMg（1−y）/2 O3-xCaTiO 3（BTFM-CTO）的体样品在室温下同时具有铁电性、弱铁磁性和磁电性。在BTFM-CTO中，氧化铋的挥发性和复杂的亚固相线反应动力学导致形成微量的亚铁磁性尖晶石杂质，这使得它们的固有磁性和磁电性质的定量表征复杂化。在这里，设计了BTFM-CTO的单相本体样品的受控合成路线，并确定了它们的固有性质。例如，组成x = 0.15，y = 0.75显示饱和磁化强度为0.0097μB/Fe，线性磁电磁化率为0.19（1）ps m-1，室温下极化为66 μC cm-2。弱铁磁性和线性磁电耦合的开始与中子衍射的大块长程磁序的开始一致。这里开发的合成策略将是非常宝贵的，因为BTFM-CTO的相图被进一步探索，并作为合成其他成分复杂的BiFeO 3相关材料的例子。
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 0.0097μB per Fe, a linear magnetoelectric susceptibility of 0.19(1) ps m−1, and a polarization of 66 μC 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.