Crystallographical and morphological changes in charge-ordering transition of RFe<sub>2</sub>O<sub>4</sub> (R: Y, Lu) investigated by transmission electron microscopy
Crystallographical and morphological changes in charge-ordering transition of RFe<sub>2</sub>O<sub>4</sub> (R: Y, Lu) investigated by transmission electron microscopy
复制标题
透射电子显微镜研究 RFe<sub>2</sub>O<sub>4</sub> (R: Y, Lu) 电荷有序转变的晶体学和形态变化
DOI：
10.1080/00150193.2021.1984762
复制
发表时间：
2021
期刊：
影响因子：
0.8
通讯作者：
Murakami Y.
中科院分区：
文献类型：
--
作者：
Horibe Y.;Mori S.;Ikeda N.;Yoshii K.;Maeno H.;Murakami Y.
采用能量过滤透射电镜结合常规透射电镜研究了RFe2O4（R: Y和Lu）中电荷有序晶体结构和畴结构的温度依赖性。在加热过程中，yfe2o4和lufe2o4均出现了三维到二维的电荷有序转变。此外，利用能量过滤透射电镜获得的实空间图像显示，yfe2o4具有比LuFe2O4更少的各向异性纳米级电荷有序畴。在rfe2o4中的这些发现表明，在该体系中与电荷顺序相关的结构相变中，除了双层内的相互作用外，Fe-O双层之间的交换相互作用也很重要。
Temperature dependence of charge-ordered crystal structures and domain structures in RFe2O4(R: Y and Lu) was investigated by energy-filtered transmission electron microscopy, combined with conventional transmission electron microscopy. The presence of three-dimensional to two-dimensional charge ordering transition were observed in both YFe2O4and LuFe2O4on heating. Furthermore, real-space images obtained with the energy-filtered transmission electron microscopy revealed that YFe2O4has less anisotropic nanometer-scale charge-ordered domains than LuFe2O4. These findings in RFe2O4indicate the importance of the interchange interactions between Fe-O bilayers in addition to those within bilayers in the structural phase transitions associated with charge ordering in this system.