cerium digermanide | 12014-52-7

• 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: cerium digermanide
• 英文别名: Cerium--germane (1/2)；cerium;germane
• CAS: 12014-52-7
• 化学式: CeGe₂
• 分子量: 285.3
• InChiKey: GNUHKMMBMGYKTL-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -2.9
• 重原子数：
  3
• 可旋转键数：
  0
• 环数：
  0.0
• sp3杂化的碳原子比例：
  0.0
• 拓扑面积：
  0
• 氢给体数：
  0
• 氢受体数：
  0

反应信息

• 作为反应物：
  描述：

  Cerium--gallium (1/2) 、 cerium digermanide 以0%的产率得到
  参考文献：
  名称：

  Magnetic properties of CeGe2−xGax alloys

  摘要：

  CeGeGa, which has the alpha-ThSi(2) type structure, has been reported to be a dense Kondo ferromagnet with a Curie temperature of 5.5 K. In the present work we have studied the effect of varying Ge/Ga concentration on the magnetic behavior of Ce ions in the alloy system CeGe(2-x)Ga(x). We find that isostructural alloys are formed for 0.7 less than or equal to x less than or equal to 1.3. The off-stoichiometric alloys also order magnetically. Magnetisation data show that CeGe(1.3)Ga(0.7) is ferromagnetic like CeGeGa but CeGe(0.7)Ga(1.3) orders anti-ferromagnetically. A fairly large temperature independent CIT exceeding 50 mJ/(mol K(2)) in the paramagnetic region is observed in the off-stoichiometric alloys indicating the presence of Kondo interaction as in CeGeGa.

  DOI：

  10.1016/0921-4526(96)00122-6
• 作为产物：
  描述：

  氢化铈 (CeH3) 、 锗烷 以 neat (no solvent) 为溶剂， 生成 cerium digermanide
  参考文献：
  名称：

  Correlation between the Kondo temperature and the photoemission spectral function in theCeSix(1.6≤x≤2) system

  摘要：

  In this paper, we study the evolution of the photoemission 4f-electron spectral density as a function of concentration in the CeSi(x) (1.6 less-than-or-equal-to x less-than-or-equal-to 2) system. The physical properties are strongly composition dependent around x = 2 reflecting large variations of the Kondo temperature with Si vacancies. Then this system represents an ideal case for photoemission investigations since it is possible to tune the Kondo temperature without significant changes of the non-f-electron density of states. Our spectroscopic measurements show a correlation between the Kondo temperature and the 4f intensity near the Fermi level as expected in the framework of the single-impurity Anderson model.

  DOI：

  10.1103/physrevb.48.10599

文献信息

• Isothermal cross-section of the Ce–Pd–Ge phase diagram at 600°C
  作者：Yu.D. Seropegin、A.V. Gribanov、O.I. Bodak

  DOI：10.1016/s0925-8388(98)00247-3

  日期：1998.5

  The interaction of the components in the Ce-Pd-Ge system at 600 degrees C was investigated over the whole concentration range by X-ray powder and monocrystal diffraction, metallography, and X-ray microprobe analysis. The formation of the previously reported phases, CePdGe and CePd2Ge2, was confirmed and 15 new ternary compounds were observed. The crystal structures of the compounds Ce2PdCe6, Ce(Pd,Ge)(2), Ce3Pd20Ge6, CePd2Ge, Ce7Pd4Ge2 and CePd5Ge3 were determined. (C) 1998 Elsevier Science S.A.
• High-pressure synthesis and structures of lanthanide germanides of LnGe5 (Ln=Ce, Pr, Nd, and Sm) isotypic with LaGe5
  作者：Hiroshi Fukuoka、Kazuya Baba、Mayumi Yoshikawa、Fumiko Ohtsu、Shoji Yamanaka

  DOI：10.1016/j.jssc.2009.05.018

  日期：2009.8

  A series of lanthanide penta-germanides LnGe(5) (Ln = Ce, Pr, Nd and Sm) has been prepared by high-pressure (5-13 GPa) and high-temperature (500-1200 degrees C) reaction. CeGe5 crystallizes in an orthorhombic unit cell (S.G. Immm (71)) with a = 4.000(5)angstrom, b = 6.192(5)angstrom, c = 9.86(1)angstrom, and V = 244.1(5) angstrom(3). The new germanides are isotypic with LaGe5 Consisting of a Ge covalent network with tunnels where guest ions Ln(3+) are situated. The network is composed of sublayers; with edge-sharing Ge six-membered rings with only boat conformation. The sublayers are connected by rare eight-coordinated Ge atoms. The cell volume of the compounds systematically decreases from La to Sm compounds, except for CeGe5. owing to the lanthanide contraction. The lattice constants of CeGe5 are smaller than those of the Pr compound because it contains Ce4+ ions. CeGe5 is paramagnetic above 2 K. but does not obey the Curie-Weiss law. PrGe5 and NdGe5 are Curie-Weiss type paramagnets with Weiss temperatures of -3.3 and -18.4 K. SmGe5 shows an antiferromagnetic transition at 10.4 K. (C) 2009 Elsevier Inc. All rights reserved.