【作者】 张吉亮；

【导师】 曾令民；

【作者基本信息】 广西大学 ， 凝聚态物理， 2006， 硕士

【摘要】 本论文研究并确定了Cu—La—Sb三元系合金相图693K等温截面以及化合物DyAlSi高温相、化合物Tb₆FeSb₂的晶体结构与磁性。主要内容如下： 1、Cu-La-Sb三元合金相图693K等温截面 利用X射线衍射分析和光学显微镜等方法，测定了Cu—La—Sb三元系合金相图693K等温截面中的相关系。该等温截面由17个三相区、33个两相区、17个单相区组成。并证实了三元化合物CuLaSb₂和Cu₃La₃Sb₄的存在。 2、新稀土化合物的晶体结构和磁性 利用X射线粉末衍射和Rietveld结构精修方法测定了化合物DyAlSi高温相的晶体结构，其结构数据如下：a=0.41254（5）nm，c=1.44079（3）nm，Z=4，密度D_calc=5.891g/cm³，空间群为I4₁/amd（No.141），α-ThSi₂的结构类型。Rietveld结构修正的最后结果为：峰形因子R_p=10.6％，权重因子R_wp=13.5％。化合物在测量范围85K-230K呈现顺磁性，其有效顺磁磁矩为9.04μB/摩尔。 对化合物Tb₆FeSb₂的晶体结构进行了Retveld精修，其结构数据如下：更多还原

【Abstract】 Phase relations in the Cu-La-Sb ternary system at 693K have been investigated in this work. The crystal structures and magnetic properties of high-temperature DyAlSi and the compound Tb₆FeSb₂ have also been studied. The main contents were as follows:1 The isothermal section of Cu-La-Sb ternary system at 693KThe phase relationship in the Cu-La-Sb ternary system at 693K has been studied mainly by means of X-ray powder diffraction with the aid of differential thermal analysis and optical microscope. There are 17 three-phase regions, 33 two-phase regions and 17 single-phase regions in this ternary system at 693K.Two ternary compounds CuLaSb2 and Cu₃La₃Sb₄ were found.2 Crystal structure and magnetic properties of two new compoundsThe crystal structure of the high-temperature DyAISi has been studied by X-ray powder diffraction technique and refined by Rietveld profile fitting method. The compound has a tetragonal space group I4₁/amd （No. 141） with the lattice parameters a=0.41254（5）nm, c=1.44079（3）nm,Z=4. D_calc=5.891g/cm³ and α-ThSi₂ structure type. The Rietveld refinement result was R_p=10.6% and R_wp=13.5%. The compound showed paramagnetic behavior in the measured temperature range from 85K to 230K. The更多还原