samarium hexaboride

• 分子结构分类: 无机化合物 - 混合金属/非金属化合物 - 各种混合金属/非金属
• 英文名称: samarium hexaboride
• 化学式: B₆Sm
• 分子量: 215.226
• InChiKey: XIZQGMQIHKVUBY-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -7.1
• 重原子数：
  7.0
• 可旋转键数：
  0.0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为反应物：
  描述：

  三氢化钐 、 samarium hexaboride 反应 1.5h， 生成 samarium tetraboride
  参考文献：
  名称：

  Peculiarities of electronic, phonon and magnon subsystems of lanthanum and samarium tetraborides

  摘要：

  Experimental research was carried out to study the temperature dependences of heat capacity C-p(T = 2-300 K), lattice parameters a(T), and c(T), (5-300 K) of lanthanum and samarium tetraborides. A comparison with data obtained previously for LuB4 reveals the peculiar influence of lanthanide contraction and the rare-earths mass on the thermodynamic properties of rare earth tetraborides at low and high temperatures. Sharp anomalies were found in the heat capacity and thermal expansion for SmB4 at T-N = 25.1 K, conditioned by the phase transition into antiferromagnetic state. The more poorly defined heat capacity anomaly around 7 K is referred to the quadrupole orbital fluctuation of the atomic magnetic moments for Sm3+ ions. The electronic, lattice, and magnetic contributions to the heat capacity and thermal expansion of samarium tetraboride were defined. Our approach makes it possible to adequately approximate the lattice components of heat capacity and thermal expansion by combining the Debye and Einstein contributions, which are based on the joint analysis of calorimetric and X-ray data. The influence of the frustration of the atomic magnetic moment system for Sm3+ ions on the thermodynamic characteristics of the samarium tetraboride magnetic phase transition was revealed. (C) 2015 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.jallcom.2015.06.101
• 作为产物：
  描述：

  硼烷 、 三氢化钐 以 neat (no solvent) 为溶剂， 生成 samarium hexaboride
  参考文献：
  名称：

  Ground state properties of SmB6

  摘要：

  We have studied the ground state properties of the intermediate valence narrow-gap semiconductor SmB6 by means of point-contact (PC) spectroscopy and specific heat measurements. The density of states derived from PC tunneling spectra could be decomposed into two energy-dependent parts with E-g = 21 meV and E-d = 4.5 meV wide gaps, and a finite residual density of states at the Fermi level. The specific heat of SmB6 is enhanced below about 2 K, more pronounced for the sample with less impurities. This behavior can be attributed to the formation of a coherent state within the residual density of states in the energy gap. (C) 2002 Elsevier Science B.V. All rights reserved.

  DOI：

  10.1016/s0921-4526(01)01127-9

文献信息

• Low-temperature synthesis and electronic transport of topological insulator SmB₆nanowires
  作者：Wei Han、Yang Qiu、Yanming Zhao、Hao Zhang、Jian Chen、Sheng Sun、Linfeng Lan、Qinghua Fan、Qidong Li

  DOI：10.1039/c6ce01250g

  日期：——

  We report a novel solid state method to prepare samarium hexaboride (SmB6) nanowires at low temperatures of 220–240 °C. Scanning electron microscopy (SEM) images show that the SmB6 nanowires have diameters from 50 to 120 nm and lengths from 1 to 8 μm. Transmission electron microscopy (TEM) images reveal that the SmB6 nanowires are single crystalline with a preferred [001] growth direction. Electronic transport shows that a SmB6 nanowire has a high saturation temperature of 6 K and an enhanced surface conduction.

  我们报道了一种新颖的固态方法，在低温220–240°C下制备六硼化钐（SmB6）纳米线。扫描电子显微镜（SEM）图像显示，SmB6纳米线的直径介于50到120纳米之间，长度从1到8微米不等。透射电子显微镜（TEM）图像揭示，SmB6纳米线为单晶结构，具有优选的[001]生长方向。电子输运特性表明，一根SmB6纳米线具有高达6 K的高饱和温度和增强的表面电导。
• Molten salt synthesis of samarium borides with controllable stoichiometry and morphology
  作者：Xiyan Liu、Yu Gong

  DOI：10.1016/j.jallcom.2021.159174

  日期：2021.6

  samarium from XANES analysis. The SmB4 nanorods and SmB6 nanocubes synthesized in molten salt possess similar paramagnetic properties to those obtained by other methods, which demonstrates the capability for the facile synthesis of lanthanide borides with controllable stoichiometry and morphology in molten salt under mild conditions.

  硼化exhibit具有独特的电和磁性能，在许多领域都有潜在的应用。然而，通过简单的合成方法获得具有可控的化学计量和形态的结晶硼化still仍然具有挑战性。在这里，我们报告了通过卤化mar和NaBH 4在熔融的LiCl-KCl中的反应，一锅法合成两个硼化phase相。通过改变前体比和反应时间来控制化学计量和形态。结晶SmB 4具有直径约为60-90 nm的棒状结构，并且SmB 6获得了约50-100 nm的纳米立方体。根据XRD和SEM结果，SmB 4以Sm / B比为1：3的纳米棒从最初形成的SmB 4纳米膜演化而来，而以Sm / B比为1:10的SmB 6纳米立方的形成是由SmB 4介导的。从膜状SmB 4到立方SmB 6的转变最可能是由于在过量的NaBH 4存在下将Sm 3+还原为Sm 2+而将SmB 4纳米晶体破坏的结果，这与氧化变化是一致的XANES分析得出的状态。SmB 4纳米棒和SmB
• Thermoelectric properties of some metal borides
  作者：Masatoshi Takeda、Tadahiro Fukuda、Ferrer Domingo、Takahiro Miura

  DOI：10.1016/j.jssc.2003.02.005

  日期：2004.2

  their thermoelectric properties. Single phase of orthorhombic AlMgB14, which contains B12 icosahedral clusters as building blocks, was obtained at sintering temperatures between 1573 and 1823 K. Seebeck coefficient (α) and electrical conductivity (σ) of the phase were about 500 μV/K and 10−1 1/Ω m at room temperature, respectively. These values are comparable to those of metal-doped β-rhombohedral boron

  合成了多晶AlMgB 14和一些六硼化物（CaB 6，SrB 6，YbB 6，SmB 6和CeB 6）以检查其热电性能。在1573至1823 K之间的烧结温度下获得了正交晶AlMgB 14单相，其中包含B 12二十面体簇作为构建基块。该相的塞贝克系数（α）和电导率（σ）分别约为500μV/ K和10 室温下分别为-1 1 /Ωm。这些值与金属掺杂的β相当-菱面体硼。在另一方面，具有二价阳离子金属六硼化物具有大的负的α范围从-100到-270μV/ K在驾驶室1073个K.计算的功率因子6和SRB 6超过10 -3  W / K 2 的整个范围内米温度测量值。结果，可以认为它们是n型热电材料的有希望的候选者。
• 11B nuclear quadrupole interaction in metal hexaborides (MB6)
  作者：M. Aono、S. Kawai

  DOI：10.1016/0022-3697(79)90033-7

  日期：1979.1

  and trivalent-metal hexaborides (MB 6 ) as well as in mixed-valent SmB 6 has been measured by the nuclear magnetic resonance method. In each group of divalent- and trivalent-metal hexaborides, ¦ eq ¦ decreases remarkably with increasing lattice parameter. At a given lattice parameter, ¦ eq ¦ for the trivalent-metal hexaborides is smaller than that for the divalent-metal hexaborides. The value of ¦ eq

  摘要 用核磁共振方法测量了二价和三价金属六硼化物（MB 6 ）以及混合价SmB 6 中硼原子核电场梯度的大小，β eq β。在每组二价和三价金属六硼化物中，β eq β 随着晶格参数的增加而显着降低。在给定的晶格参数下，三价金属六硼化物的 β eq 小于二价金属六硼化物的。SmB 6 的β eq β 值介于二价和三价金属六硼化物之间。在这些结果的基础上，讨论了六硼化物的电子结构。
• Floating Zone Growth and High Temperature Hardness of Rare-Earth Hexaboride Crystals: LaB6, CeB6, PrB6, NdB6, and SmB6
  作者：S. Otani、H. Nakagawa、Y. Nishi、N. Kieda

  DOI：10.1006/jssc.2000.8842

  日期：2000.10

  Single crystals of rare-earth hexaborides, LaB6, CeB6, PrB6, NdB6, and SmB6, were prepared by the floating zone method. Their crystal quality increased as the atomic number of the rare-earth metals increased. The difference in the quality was explained from the high-temperature hardness and the growth temperature.

  通过浮区法制备了稀土六硼化物LaB 6，CeB 6，PrB 6，NdB 6和SmB 6的单晶。它们的晶体质量随着稀土金属原子序数的增加而提高。从高温硬度和生长温度解释了质量的差异。