LaNi_(5-x)Al_xD_y(x=0.1,0.25,0.3,0.45,0.5,0.75)微观结构中子衍射研究  

Neutron Diffraction Study on Microstructure of LaNi_(5-x)Al_xD_y (x=0.1,0.25,0.3,0.45,0.5,0.75)

作　　者：李峻宏[1] 潘鑫[2] 孙凯[1] 高建波[1] 张百生[1] 刘蕴韬[1] 陈东风[1] 

机构地区：[1]中国原子能科学研究院,北京102413 [2]中国机械工业联合会,北京100823

出　　处：《原子能科学技术》2010年第B09期22-30,共9页Atomic Energy Science and Technology

基　　金：国家重点基础研究发展计划资助项目(2010CB833101)

摘　　要：在室温下分别测量了一系列LaNi5-xAlx(x=0.1,0.25,0.3,0.45,0.5,0.75)合金及其氘化物的中子衍射谱,利用FullProf程序对LaNi5-xAlx合金的衍射数据进行了精修,确定了它们的空间群为P6/mmm,得到了合金的晶胞参数、晶胞体积以及原子的占位,发现Al仅替代了部分处于3g位置的Ni,随着Al含量的增加,晶胞体积的变化量与Al替代量之间基本呈线性关系。对LaNi5-xAlxDy衍射数据的精修确定了氘化物的空间群仍为P6/mmm,分析了充氘后的相成分及晶胞参数、晶胞体积变化,得到了氘原子在晶胞中的占位和分布。By using neutron scattering technique, a series of LaNi5-xAlx（x=0.1, 0.25, 0.3, 0.45, 0.5, 0.75） alloys and their deuterides were studied at room temperature. A series of experimental data of LaNi5-xAlx alloys were refined by means of program FullProf. Their space groups are found to be P6/mmm. The alloys’ lattice parameters, cell volumes and atomic positions were obtained. It is discovered that Al atoms just substitute a part of Ni atoms which are at 3g position. Furthermore, it is also learned that the variety of cell volume is almost proportional to the content of Al atoms in the alloys. The refined results of LaNi5-xAlxDy diffraction data show that the deuterides’ space groups are still P6/mmm. The varieties of phase components, lattice parameters and cell volumes were analyzed after charging deuterium. Afterwards, the atomic positions and distribution of deuterium atoms in the cell were obtained.

关 键 词：La—Ni—Al合金 晶体结构 氘化物 氘占位 

分 类 号：O571.56[理学—粒子物理与原子核物理]