New Manganese-Bearing Antimonides and Bismuthides with Complex Structures. Synthesis, Structural Characterization, and Electronic Properties of Yb9Mn4+xPn9 (Pn = Sb or Bi)†
New Manganese-Bearing Antimonides and Bismuthides with Complex Structures. Synthesis, Structural Characterization, and Electronic Properties of Yb9Mn4+xPn9 (Pn = Sb or Bi)†
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DOI：
10.1021/cm901633r
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发表时间：
2010-02
影响因子：
8.6
通讯作者：
S. Xia;S. Bobev
中科院分区：
文献类型：
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作者：
S. Xia;S. Bobev
本文报道了一系列具有通式Yb9Mn4+xSb9 （x≈0.2）、A9Mn4+xBi9 （a = Ca和Yb； x≈0）和Zn取代衍生物Yb9(Mn,Zn)4+xSb9 （0 < x < 0.4）的同构化合物的结构和性能研究。它们由相应的元素通过高温反应合成，并通过单晶x射线衍射确定了它们的结构。尽管是接近化学计量相，其平均晶体排列可以用正交Ca9Mn4Bi9型结构（空间群pam， No. 55）来描述，但这些三元材料存在于狭窄的均匀性范围内，因此间隙位置部分被过渡金属占据。电子结构计算证实，“空”A9Mn4Sb9或A9Mn4Bi9结构是缺乏电子的，使它们成为小掺杂原子的合适宿主。从单晶中收集的温度相关电阻率数据证明了预期的不良金属行为。Magneti……
Reported are structure and property studies on a series of isostructural compounds with general formulas Yb9Mn4+xSb9 (x ≈ 0.2), A9Mn4+xBi9 (A = Ca and Yb; x ≈ 0), and the Zn-substituted derivatives Yb9(Mn,Zn)4+xSb9 (0 < x < 0.4). They have been synthesized from the corresponding elements by high-temperature reactions, and their structures have been established by single-crystal X-ray diffraction. Despite being nearly stoichiometric phases, whose average crystallographic arrangement can be described with the orthorhombic Ca9Mn4Bi9 type structure (space group Pbam, No. 55), these ternary materials exist within narrow homogeneity ranges, whereupon an interstitial site is partially occupied by the transition metal. Electronic structure calculations confirm that the “empty” A9Mn4Sb9 or A9Mn4Bi9 structures are electron deficient, making them suitable hosts for small dopant atoms. The expected poorly metallic behavior is evidenced from temperature-dependent resistivity data gathered from single-crystals. Magneti...