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首页> 外文期刊>Crystal growth & design >Crystal Shape Tailoring in Perovskite Structure Rare-Earth Ferrites REFeO3 (RE = La, Pr, Sm, Dy, Er, and Y) and Shape-Dependent Magnetic Properties of YFeO3
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Crystal Shape Tailoring in Perovskite Structure Rare-Earth Ferrites REFeO3 (RE = La, Pr, Sm, Dy, Er, and Y) and Shape-Dependent Magnetic Properties of YFeO3

机译：钙钛矿结构稀土铁氧体REFeO3（RE = La，Pr，Sm，Dy，Er和Y）中的晶体形状定制和YFeO3的形状依赖性磁性能

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摘要

Controllable growth of perovskite oxide with tailored shapes is challenging but promising for shape dependent physical and chemical property studies and probable applications. In this article, we report a general method for tailoring the crystal shape of perovskite structure rare-earth ferrite (REFeO3) crystals in hydrothermal conditions. By adjusting the ratio of KOH to urea, various shapes of REFeO3 crystals can be prepared, such as LaFeO3 truncated cubes, PrFeO3 perpendicular cross prisms, SmFeO3 crossed bars with trustum, DyFeO3 double pyramids on cubes, ErFeO3 distorted octahedrons, and YFeO3 long bars and thick hexagonal elongated plates. Detailed shape tailoring conditions for each phase of the crystals have been discussed clearly. The structure-dependent shape growing mechanism for each REFeO3 is generally discussed by consideration of the variance of reduced unit cell parameters in reference to the ideal cubic ABO(3) perovskite structure. DyFeO3 was taken as an example to elucidate the crystal shape formation mechanism based on the Bravais Friedel-Donnay-Harker theory. The magnetic property of the YFeO3 crystal shows shape dependence: elongated bars have the highest saturated magnetization, while the lowest coercive field, while the tailored polyhedrons are vice versa. This paper not only builds a general technique for tailoring the crystal shape to various shapes of REFeO3 crystals but also provides many crystals for further study and application of anisotropy either in physical or in chemical properties.
机译：具有可定制形状的钙钛矿氧化物的可控生长是具有挑战性的，但对于形状依赖性的物理和化学性质研究以及可能的应用是有前途的。在本文中，我们报告了一种在水热条件下调整钙钛矿结构稀土铁氧体（REFeO3）晶体的晶体形状的通用方法。通过调整KOH与尿素的比例，可以制备各种形状的REFeO3晶体，例如LaFeO3截头立方体，PrFeO3垂直交叉棱柱，带有Trustum的SmFeO3交叉棒，立方体上的DyFeO3双金字塔，ErFeO3扭曲的八面体和YFeO3长棒和厚的六角形细长板。已经清楚地讨论了晶体各相的详细形状调整条件。通常通过参考理想的立方ABO（3）钙钛矿结构考虑还原晶胞参数的方差来讨论每种REFeO3的结构依赖性形状生长机制。以DyFeO3为例，根据Bravais Friedel-Donnay-Harker理论阐明了晶体形状的形成机理。 YFeO3晶体的磁性取决于形状：细长棒具有最高的饱和磁化强度，而矫顽场最低，而定制的多面体则相反。本文不仅建立了使晶体形状适应REFeO3晶体的各种形状的通用技术，而且为物理或化学性质的各向异性的进一步研究和应用提供了许多晶体。

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