Cobalt--germane (2/1) | 12432-92-7

• 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: Cobalt--germane (2/1)
• 英文别名: cobalt;germane
• CAS: 12432-92-7
• 化学式: Co₂Ge
• 分子量: 190.576
• InChiKey: MZEIGMJVFZZWHI-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -1.46
• 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

• 作为产物：
  描述：

  钴 、 锗烷 以 neat (no solvent) 为溶剂， 生成 Cobalt--germane (2/1)
  参考文献：
  名称：

  The displacive phase transformation Co2Ge(h)→Co2Ge(l)

  摘要：

  X-ray powder diffraction, metallographic and differential thermoanalytical methods were used for investigation of the displacive phase transformation Co2Ge(h)-->Co2Ge(1), where h and I denote the high- and low-temperature phases, respectively. By liquid quenching of the alloy Co66.7Ge33.3, the high-temperature phase can be retained: Co2Ge(h) Pearson-Parthe symbol hP(6-0.3), space group P6(3)/mmc, Ni2In type, a = 3.9639(4) A, c = 5.022(1) Angstrom. By annealing of the same alloy at 773 K for 5 days, the low-temperature phase Co2Ge(l) is obtained: oP12, Pnma (Nr. 62), Co2Si type, a=5.0504(4) Angstrom, b=3.8378(3) Angstrom, c=7.2960(5) Angstrom. The temperature of the phase transformation Co2Ge(1)-->Co2Ge(h), as determined by differential scanning calorimetry, is 960 K. By light optical microscopy using polarized light, the occurrence of significant multiple twinning has been detected for the low-temperature phase Co2Ge(1), indicating the displacive nature of this polymorphic phase transformation. (C) 2002 Elsevier Science B.V. All rights reserved.

  DOI：

  10.1016/s0925-8388(02)01303-8

文献信息

• Metallocages for Metal Anions: Highly Charged [Co@Ge ₉ ] ⁵⁻ and [Ru@Sn ₉ ] ⁶⁻ Clusters Featuring Spherically Encapsulated Co ¹⁻ and Ru ²⁻ Anions
  作者：Benedikt J. L. Witzel、Wilhelm Klein、Jasmin V. Dums、Marina Boyko、Thomas F. Fässler

  DOI：10.1002/anie.201907127

  日期：2019.9.9

  compositions “K5Co1.2Ge9” and “K4Ru3Sn7” exhibit characteristic bonding modes originating from metal atoms in the center of polyhedral clusters, thus revealing that filled clusters are present in these alloys. We report also on the structural characterization of [Co@Ge9]5− (1a) and [Ru@Sn9]6− (2a) obtained from solutions of the respective alloys.

  内六面体团簇可作为金属间化合物的分子模型，金属间化合物是一类几乎不了解键合原理的化合物。在本文中，我们报道了迄今为止在单个簇上具有最高电荷的可溶性簇阴离子。这些簇反映了金属间化合物中金属间簇和相应配位多面体之间的相似性。现在，我们将拉曼光谱学确立为可靠的探针，以首次确定金属间相中存在离散的，内层填充的团簇。标称成分为“ K 5 Co 1.2 Ge 9 ”和“ K 4 Ru 3 Sn 7 ”的三元前体合金”表现出源自多面体簇中心金属原子的特征键合模式，因此表明这些合金中存在填充簇。我们还报告了从相应合金溶液中获得的[Co @ Ge 9 ] 5−（1a）和[Ru @ Sn 9 ] 6−（2a）的结构特征。
• Structure and Thermal Stability of Co₆₀Ge₄₀Prepared by Mechanical Alloying
  作者：V. I. Fadeeva、L. M. Kubalova、I. A. Sviridov

  DOI：10.1023/b:inma.0000046463.69625.b1

  日期：2004.10

  The phase composition and structure of Co60Ge40 prepared by mechanical alloying followed by heat treatment are studied by x-ray diffraction, x-ray microanalysis, differential scanning calorimetry, and scanning electron microscopy. The results indicate that milling a 60 : 40 mixture of Co and Ge for 2 h leads to the formation of phase-pure, nanocrystalline beta-Co5Ge3 (B8(2) structure). This phase is chemically inhomogeneous and metastable. On heating to 720 degreesC, it transforms into a homogeneous, equilibrium phase of beta-Co5Ge3. The transformation into the stable beta phase occurs through a two-phase state, involving the formation of the orthorhombic phase Co2Ge. At t greater than or equal to 630 degreesC, Co2Ge dissolves in beta-Co5Ge3.
• Amorphization and magnetic properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Co</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Ge during mechanical milling
  作者：G. F. Zhou、H. Bakker

  DOI：10.1103/physrevb.48.13383

  日期：——

  The structural features and magnetic properties of the intermetallic compounds alpha-Co2Ge (low-temperature phase, LTP) and beta-Co2Ge (high-temperature phase, HTP) upon mechanical milling were investigated by x-ray diffraction, differential scanning calorimetry (DSC), and magnetic measurements. It turns out that starting from both the ordered LTP with Co2Si-type orthorhombic structure and the ordered HTP with Ni2In-type hexagonal structure mechanical milling generates atomic disorder during the early stage of milling and transforms the materials to an amorphous state after long-time milling. Both the LTP and the HTP are ferromagnetic at lower temperatures with Curie temperatures of 46.4 K and 6 K, respectively. The magnetic moment per Co atom at 4.2 K is 0.113mu(B) in the LTP and 0.103mu(B) in the HTP. The average magnetization at 4.2 K and the Curie temperatures of the LTP and the HTP continuously increase with increasing milling time in the early stage of milling. During the intermediate stage of milling, a discontinuous decrease in magnetic-ordering temperature (a mixture of two magnetic phases) is observed in the LTP, which strongly indicates the formation of the amorphous phase. In DSC scans the exothermic heat effects are evident, which correspond to the atomic reordering process of the disordered compounds and to the crystallization of the amorphous phase and the subsequent growth of nanometer-scale crystallites. All physical parameters measured in the present investigation tend to become constant after prolonged periods of milling. The good agremeent of all the experimental results obtained by different techniques proves that by mechanical milling well-defined metastable states in Co2Ge are generated. The amorphous phase as the final state shows spin-glass behavior: a transition at 43 K from the paramagnetic state to the spin-glass state is clearly observed upon cooling from room temperature to liquid-helium temperature.
• Dezsi, I.; Engelmann, H.; Gonser, U., Physica status solidi. A, Applied research
  作者：Dezsi, I.、Engelmann, H.、Gonser, U.、Langouche, G.

  DOI：——

  日期：——