Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
Chemistry. 2018 Aug 14;24(46):11880-11884. doi: 10.1002/chem.201802771. Epub 2018 Jul 18.
A new series of metal-substituted ϵ-iron oxides, ϵ-Ru Fe O (x=0 (1), 0.005 (2), and 0.014 (3)) nanoparticles (average size=20 nm) is synthesized by sintering iron oxide hydroxide with ruthenium hydroxide in a silica matrix. The samples are characterized by inductively coupled plasma mass spectrometry, and energy dispersive X-ray spectroscopy (EDS) of transmission electron microscope. The X-ray diffraction pattern shows that ϵ-Ru Fe O has an orthorhombic crystal structure with a space group of Pna2 and the Rietveld analyses show that Ru is doped selectively at the regular octahedral C site among the four non-equivalent Fe sites (A, B, C, and D site). Magnetization vs. temperature plots show that the Curie temperature (T ) depends on x, and T =498 K for 1, 497 K for 2, and 496 K for 3. Magnetization vs. external magnetic field plots indicate that the coercive field (H ) increases from 17.7 kOe (1) to 20.3 kOe (3). This increment of 15 % on H is attributed to the single ion anisotropy of the magnetic spin on Ru (4d , S=1/2).
一种新型的金属取代的ε-铁氧化物，ε-RuFeO（x=0（1）、0.005（2）和 0.014（3））纳米颗粒（平均尺寸为 20nm）是通过在二氧化硅基质中烧结氧化铁氢氧化物和钌氢氧化物合成的。样品通过电感耦合等离子体质谱法和透射电子显微镜的能谱法进行了表征。X 射线衍射图谱表明，ε-RuFeO 具有正交晶体结构，空间群为 Pna2，Rietveld 分析表明，Ru 选择性地掺杂在四个非等价 Fe 位（A、B、C 和 D 位）中的规则八面体 C 位。磁化强度随温度的变化图表明居里温度（T）取决于 x，x=1 时 T=498K，x=2 时 T=497K，x=3 时 T=496K。磁化强度随外磁场的变化图表明矫顽力（H）从 17.7kOe（1）增加到 20.3kOe（3）。H 的这种 15%的增量归因于 Ru（4d，S=1/2）的磁自旋的单离子各向异性。
