Cobalt;hafnium | 12016-78-3

• 分子结构分类: 无机化合物 - 均相金属化合物 - 均相过渡金属化合物
• 英文名称: Cobalt;hafnium
• 英文别名: cobalt;hafnium
• CAS: 12016-78-3
• 化学式: CoHf
• 分子量: 237.483
• InChiKey: NDRKISKJOAQGIO-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.01
• 重原子数：
  2
• 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：

  Cobalt;hafnium 在 H₂ 、 TiMoH(x) 作用下， 以 neat (no solvent) 为溶剂， 生成
  参考文献：
  名称：

  Thermodynamics of processes of hydrogen sorption by hydrides of intermetallic compounds of CrB structural type

  摘要：

  The intermetallic compounds (IMCs) HfNi, ZrNi, HfCo and ZrCo are studied by thermoanalytical methods. The thermodynamic characteristics calculated from the van't Hoff equation and obtained by the calorimetric method are compared with literature data. The dependence of the partial molar enthalpy on the IMC hydrogen content has a tendency to decrease with increasing hydrogen content in the a solution region; in the region near the alpha-(alpha + beta) and (alpha + beta)-beta boundaries there is a discontinuity; in the region of two-phase coexistence DELTA-HBAR(H) does not depend on the IMC hydride hydrogen content; during the formation of a new phase (monohydride, beta-hydride) DELTA-HBAR(H) increases.

  DOI：

  10.1016/0925-8388(91)90052-w
• 作为产物：
  描述：

  铪 、 钴 以 melt 为溶剂， 反应 120.0h， 生成 Cobalt;hafnium
  参考文献：
  名称：

  The Thermodynamic Characterization of ZrCo–H, HfCo H, HfNi H and Zr 1–x HfxNi(Co) Alloy–H Systems

  摘要：

  ZrCo and HfCo intermetallic compounds have the same cubic (CsCl-type) structure and their ternary (Zr1-xHfx)Co alloys are also cubic. ZrNi and HfNi intermetallic compounds have the orthorhombic structure (CrB-type) and the ternary (Zr1-xHfx)Ni alloys also have this structure. Thermodynamic data for hydride formation and decomposition in ZrCo, HfCo and HfNi intermetallic compounds have been determined from reaction calorimetry and from pressure-composition isotherms. Thermodynamic data have been determined for the three ternary alloys: (Zr0.75Hf0.25)Co, (Zr0.50Hf0.50)Co, and (Zr0.25Hf0.75)Co and the four ternary alloys: (Zr0.875Hf0.125)Ni, (Zr0.75Hf0.25)Ni, (Zr0.50Hf0.50)Ni, and (Zr0.25Hf0.75)Ni. This offers the opportunity to learn how the thermodynamic properties of the ternary alloy-H systems change with the stoichiometry of alloys with the same structure. (C) 2016 Elsevier B.V. All rights reserved.

  DOI：

  10.1016/j.jallcom.2016.03.207

文献信息

• Microstructural evolution and magnetic properties of Co-rich Hf-Co alloys
  作者：Indeevar Singh、Mithun Palit、Himalay Basumatary、R.P. Mathur、M.A. Joseph

  DOI：10.1016/j.jallcom.2018.05.346

  日期：2018.9

  Hf - Co binary alloys with different Hafnium concentration ranging from 12.5 to 20.5 at% have been prepared and characterized for structural attributes and magnetic properties. The alloy with 12.5 at% Hf exhibits a large volume fraction of soft magnetic alpha-Co( Hf), which impairs the hard magnetic properties. With increase of Hf concentration, the volume fraction of soft magnetic phase decreases with increase in fraction of HfCo7, leading to improvement of hard magnetic properties. The HfCo7 phase is found to be responsible for permanent magnetic behavior of the Co-rich Hf-Co binary alloys. The microstructural evolution has been unraveled through the understanding of solidification sequence and correlated with observed magnetic properties. (C) 2018 Elsevier B.V. All rights reserved.
• Mechanical properties of (HfCo)100−x(NbMo)x refractory high-entropy alloys with a dual-phase bcc-B2 structure
  作者：E. Panina、N. Yurchenko、A. Tojibaev、M. Mishunin、S. Zherebtsov、N. Stepanov

  DOI：10.1016/j.jallcom.2022.167013

  日期：2022.12
• Note on the Hf-Co phase diagram
  作者：K.H.J. Buschow、J.H. Wernick、G.Y. Chin

  DOI：10.1016/0022-5088(78)90111-x

  日期：1978.5
• Hydrogen absorption in various zirconium- and hafnium-based intermetallic compounds
  作者：R.M. Van Essen、K.H.J. Buschow

  DOI：10.1016/0022-5088(79)90178-4

  日期：1979.4
• Investigation of the thermal stability and crystallization process of amorphous Hf0.67Co0.33 − xNix alloys with 0 ⩽ ⩽ 0.33 by differential scanning calorimetry and X-ray diffraction
  作者：Kjell Jansson、Mats Nygren

  DOI：10.1016/0022-5088(91)90160-6

  日期：1991.8

  The melt-spinning technique was used to prepare amorphous Hf0.67Co0.33-xNi(x) alloys with compositions x = 0.00, 0.06, 0.11, 0.165, 0.22, 0.27 and 0.33. The crystallization process of these alloys was monitored by differential scanning calorimetry and X-ray diffraction. The crystallization temperature T1 was 776 K for x = 0.00 and decreased from 787 K to 772 K with increasing x for 0.06 less-than-or-equal-to x less-than-or-equal-to 0.33. The heat of crystallization DELTA-H1 was found to decrease with increasing x values. Amorphous Hf0.67Co0.33-xNi(x) alloys with 0.00 less-than-or-equal-to x < 0.165 crystallized directly to the thermodynamically stable phase with cubic Ni2Ti-type structure. Amorphous Hf2Ni crystallized to the tetragonal Al2Cu-type structure, while a two-phase region was observed for 0.165 less-than-or-equal-to x < 0.33. The activation energies for the crystallization processes, evaluated by the Kissinger method, increased almost linearly with x from 286 kJ mol-1 for Hf2Co to 488 kJ mol-1 for Hf2Ni.