Hydrogen-induced amorphization in C15 Laves phases RFe2
作者:M. Dilixiati、K. Kanda、K. Ishikawa、K. Aoki
DOI:10.1016/s0925-8388(01)01923-5
日期:2002.5
Abstract C15Lavesphases RFe2 (R=Y, Ce, Sm, Gd, Tb, Dy, Ho and Er) were thermally analyzed to elucidate the conditions of hydrogen-inducedamorphization (HIA) using a pressure differentialscanning calorimeter (PDSC) in a hydrogen atmosphere. Hydrogen absorption in the crystalline state, hydrogen-inducedamorphization (HIA), precipitation of RH2 and decomposition of the remaining amorphous phase into
the use of thinfilm GMMs instead of bulk is emphasized because of the ready and inexpensive production and high applicability. One of the most prominent applications using GMM films is the magnetic surfaceacousticwavedevice with tunability under an external magnetic field. Thinfilms of the giant magnetostrictive Tb 0.3 Dy 0.7 Fe 2 alloy were prepared by vacuum flash evaporation. The film structure
摘要 指出了目前巨磁致伸缩材料(GMMs)研究与开发中存在的问题,强调使用薄膜GMMs代替散装材料,因其生产方便、成本低廉、适用性强。使用 GMM 薄膜最突出的应用之一是在外部磁场下具有可调性的磁性表面声波器件。通过真空闪蒸制备了超磁致伸缩Tb 0.3 Dy 0.7 Fe 2 合金薄膜。通过控制衬底温度和沉积速率,薄膜结构能够从非晶态变为晶态。与非晶膜相比,结晶膜表现出更高的磁化强度和更大的磁致伸缩。真空中薄膜的污染促进了非晶化并显着降低了薄膜的磁致伸缩。X 射线衍射和俄歇电子能谱分析表明真空与沉积速率的比率是评估薄膜污染效果的合适指标。
Structural and magnetic properties of morphotropic phase boundary involved Tb1−xGdxFe2 compounds
Abstract In the present paper, structural, magnetic and magnetostrictive properties of Tb 1−x Gd x Fe 2 (0 ≤ x ≤ 1.0) were studied. Synchrotron x-ray diffraction (XRD) results show the non-cubic symmetry of Tb 1−x Gd x Fe 2 at room temperature and composition-induced crystallographic phase transition from rhombohedral phase to tetragonal phase. The Gd concentration dependent lattice parameters, lattice
摘要 本文研究了Tb 1−x Gd x Fe 2 (0 ≤ x ≤ 1.0) 的结构、磁性和磁致伸缩特性。同步加速器 X 射线衍射 (XRD) 结果显示室温下 Tb 1-x Gd x Fe 2 的非立方对称性和成分诱导的从菱形相到四方相的结晶相转变。同步加速器XRD检测了Gd浓度依赖的晶格参数、晶格畸变和易磁化方向的变化。随着Gd浓度的增加,居里温度Tc升高,而室温磁化强度和磁致伸缩系数λ 111 以及TbFe 2 的各向异性降低。在单离子模型的基础上,可以理解自发磁致伸缩系数 λ 111 随着 Gd 取代度的增加而减小;
Temperature dependence of the electrical resistivity of REFe2 compounds
Abstract The temperaturedependence of the electricalresistivity of the REFe 2 compounds (RE = Y, Ce, Gd, Tb, Dy, Ho, Er, Tm, Lu) in the range from 4 K up to 1000 K are presented. The outstanding feature of CeFe 2 is also demonstrated by the temperaturedependence of the thermo-power. The analysis of these data reveals that the Fe 3 d moments act as localized moments. This is supported by bandstructure
摘要 介绍了REFe 2 化合物(RE = Y、Ce、Gd、Tb、Dy、Ho、Er、Tm、Lu)在4 K 至1000 K 范围内电阻率的温度依赖性。CeFe 2 的突出特点还体现在热功率的温度依赖性上。对这些数据的分析表明,Fe 3 d 矩充当局部矩。这得到了对 YFe 2 和 LuFe 2 进行的能带结构计算的支持。
Hyperfine field at impurity 156Gd nuclei in TbT2 and TbT3 compounds (T = Fe and Co)
作者:T. Shinohara、A. Furusawa、S. Hayashibe、M. Kanazawa、M. Sato
DOI:10.1016/0304-8853(87)90440-9
日期:1987.12
Abstract The time integral γ-γ perturbed angular correlation has been measured on 156 Gd nuclei in TbFe 2 , TbFe 3 , TbCo 2 and TbCo 3 compounds. An obvious correlation is indicated between the hyperfinefields at Gd and Tb nuclei in corresponding compounds, and experimental results are discussed.