方案摘要
方案下载应用领域 | |
检测样本 | |
检测项目 | |
参考标准 |
Abstract Amorphous Co2−xFexGe (0:0 x 0:30) alloys were synthesized by direct mechanical alloying of the elemental powders in a SPEX 8000 mixer mill, and their micro-structure and magnetic properties were investigated using X-ray diffraction (XRD), Mössbauer spectroscopy and dc magnetization measurements. The as-milled alloys showed amaximum in magnetization at substantially high temperatures of about 200–240K and field dependent irreversibility effects, which could be attributed to a superparamagnetic blocking of uncoupled magnetic clusters in a non-magnetic matrix. When the samples were subjected to a heat treatment at 440C for 1 h, the maxima shifted to very low temperatures in the region of 40–45 K. A broadening of the transition as well as shift to lower temperature was observed with increase in the field. This behavior was consistent with a spin glass-like freezing taking place at this temperature, and in agreement with the observations of Zhou and Bakker who synthesized amorphous Co2Ge by mechanical milling of crystalline Co2Ge for long durations of about 240 h. There is also a systematic increase in the spin glass freezing temperature with Fe concentration. Our results imply that the as-milled alloys are superparamagnetic, the heat treatment carried out on the as-milled samples is resulting in homogenous amorphous alloys, and the magnetic behavior is changing from superparamagnetic to spin glass. © 2001 Elsevier Science B.V. All rights reserved
Hot consolidation of Cu–Li powder alloys
相关产品
BioDrop 微量比色皿
BioDrop TOUCH 超微量分光光度计
BioDrop μLITE 超微量分光光度计
BioDrop DUO 多功能超微量分光光度计
高通量动植物组织研磨机
SpectroMill®-TS单研磨罐高能量球磨机
SpectroMill® II双研磨罐高能量球磨机
冷冻研磨系统
HT Mini高能量台式动植物组织研磨机
HT Homogenizer高通量动植物组织研磨机
Talboys 多点磁力搅拌器
Talboys 数显型5000敞开式摇床
Talboys Professional 3500恒温培养摇床
Talboys 数显型旋涡混合器
Talboys 数显型多管式旋涡混合器
关注
拨打电话
留言咨询