【摘 要】
：
采用直流电弧等离子体法在甲烷(CH4)、氢氩、氨气、氨氮气氛下制备了钐铁合金的多种纳米粉.在甲烷气氛下没有钐或铁的氧化物生成,但生成Fe3C;在氢氩和氨氮气氛下,有钐的氧化
论文部分内容阅读
采用直流电弧等离子体法在甲烷(CH4)、氢氩、氨气、氨氮气氛下制备了钐铁合金的多种纳米粉.在甲烷气氛下没有钐或铁的氧化物生成,但生成Fe3C;在氢氩和氨氮气氛下,有钐的氧化物.在纯甲烷气氛下制备的样品矫顽力最大,在氨氮气氛下样品的饱和磁化强度和剩余磁化强度最高,而且矫顽力中等.分析了氨氮气氛下样品高温结晶前后结构和磁学性质的异同,发现再结晶过程中样品被氧化了,磁学性能急剧下降.
其他文献
Mononuclear complex {[Cu(N-men)2(cda)2]([Cu(N-men)2]((ClO4)2} was synthesized by sodium carbamyldicyanomethanide Na(cda), N-methylethylenediamine and hydrate co
A new phase, the rare earth complex oxide SnDy2O4 was synthesized by the thermal decomposition of its oxalate precursor that was prepared by rheological phase r
用450W高压汞灯照射H3PMo12O40·5H2O和（Bu4N）Br（TBA）的DMF（N,N-二甲基甲酰胺）溶液,合成了12-钼磷酸四丁基铵杂多蓝（Bu4N）4[PMo12O40]·2DMF·H2O,用元素分析,IR,固体漫反射电子光谱,
The quantum correspondence of the very peculiar phenomenon of classical chaos-the exponential instability of motion can be characterized by the initially expone
A scheme for probabilistic teleporting an unknown two-particle state of general formation by partly pure entangled four-particle state is proposed. It is shown
从贯叶连翘( Hypericum perforatum L.)地上部分的80%乙醇提取物中分离得到1个新的黄酮苷和6个已知黄酮类化合物.采用红外光谱、紫外光谱、质谱和核磁共振光谱等波谱技术测得
Polysiloxane bearing pendant quatemary ammonium groups (PSI) was used to modify the surface properties ofepoxy resins. In the cured resin, PSI formed the disper
The phthalate esters such as DMP, DEP, DBP and DEHP in air, soil and plant samples in plastic film greenhouse were clean up with fine silica gel column and dete
For most scheduling problems the set of machines is fixed initially and remainsunchanged for the duration of the problem. Recently Imreh and Nogaproposed to add
The montmorillonites (MMTs), layered, smectite-type silicates, were premodified by two different methods priorto the polymer melt intercalation. In one case MMT