论文部分内容阅读
用电弧熔炼方法合成了化合物ＲＥ３Ｃｕ３Ｓｂ４（ＲＥ＝ Ｎｄ，Ｓｍ ，Ｔｂ，Ｄｙ，Ｈｏ）， 采用粉末Ｘ射线衍射方法测定了其晶体结构。化合物属立方晶系，Ｙ３Ａｕ３Ｓｂ４ 类型， 空间群Ｉ４３ｄ（Ｎｏ．２２０），皮尔森玛ｃＩ４０。晶胞参数：Ｎｄ３Ｃｕ３Ｓｂ４ ：ａ＝０．９６７４９（１） ｎｍ， Ｖ＝０．９０５６１（３） ｎｍ３；Ｓｍ３Ｃｕ３Ｓｂ４：ａ＝ －０．９６１４５（１） ｎｍ ，Ｖ＝０．８８８７５（３） ｎｍ３ ；Ｔｂ３Ｃｕ３Ｓｂ４： ａ＝０．９５３６２（１） ｎｍ ， Ｖ＝ ０．８６７２１（３）ｎｍ３；Ｄｙ３Ｃｕ３Ｓｂ４： ａ＝０．９５０８８（１） ｎｍ ， Ｖ＝０．８５９７５（３） ｎｍ３；Ｈｏ３Ｃｕ３Ｓｂ４ ： ａ＝０．９４８８（２） ｎｍ ， Ｖ＝０．８５４１（５） ｎｍ３。每个单胞中包含４ 个化合式量。此结构中，Ｃｕ 原子均处于Ｓｂ 原子所形成的配位四面体中心， 这些共价结合的配位四面体通过共顶最终联接形成三维ＣｕＳｂ 网络，稀土原子则散布在网络之间的空隙中。化合物电荷平衡结构式可表示为ＲＥ３＋３ Ｃｕ１＋３ Ｓｂ３－４ ， 化合物具有导电性， 为金属性Ｚｉｎｔｌ 相。原子成键具有典型过渡性。原子的“配位数”遵从配位环境规律。化合物的
The compound RE3Cu3Sb4 (RE = Nd, Sm, Tb, Dy, Ho) was synthesized by arc melting method and its crystal structure was determined by powder X-ray diffraction. Compounds belong to the cubic crystal system, Y3Au3Sb4 type, space group I 43d (No.220), Pearsonma cI40. Cell parameters: Nd3Cu3Sb4: a = 0.96749 (1) nm, V = 0.90561 (3) nm3; Sm3Cu3Sb4: a = -0.96145 (1) nm, V = 0.88875 (3) nm3; Tb3Cu3Sb4 : A = 0.95362 (1) nm, V = 0.86721 (3) nm3; Dy3Cu3Sb4: a = 0.95088 (1) nm, V = 0.85975 (3) nm3; Ho3Cu3Sb4: a = 0.9488 (2) nm, V = 0.8541 (5) nm3. Each unit cell contains four compounds. In this structure, Cu atoms are all located in the center of coordination tetrahedra formed by Sb atoms. These covalently bonded coordination tetrahedra finally form a three-dimensional CuSb network through co-top bonding, and rare earth atoms are interspersed in the gaps between networks in. Compound charge balance formula can be expressed as RE3 +3 Cu1 +3 Sb3-4, the compound has conductivity, a metallic Zintl phase. Atom bonding has the typical transitional nature. Atomic “coordination number” to comply with coordination rules. Compound