Tantalum--vanadium (1/2) | 12067-68-4

• 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: Tantalum--vanadium (1/2)
• 英文别名: tantalum;vanadium
• CAS: 12067-68-4
• 化学式: TaV₂
• 分子量: 282.831
• InChiKey: STQOGYGOERBIDF-UHFFFAOYSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  -0.01
• 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：

  Tantalum--vanadium (1/2) 、 水 以 水 为溶剂， 生成
  参考文献：
  名称：

  Investigation of the ternary systems Nb-V-H and Ta-V-H

  摘要：

  DOI：

  10.1016/0022-5088(86)90201-8
• 作为产物：
  描述：

  钽 、 钒 生成 Tantalum--vanadium (1/2)
  参考文献：
  名称：

  低温下TaV2中H（D）原子低频局部运动的NMR证据

  摘要：

  对 TaV2Hx (Dx) 中 1H、2D 和 51V 自旋晶格弛豫率 T1-1 的温度依赖性的测量表明，除了与 H(D) 扩散相关的通常最大值之外，还有第二个低温 T1-1 最大值。此特征可归因于 H(D) 原子的低频局部运动。在低温下观察到氢同位素取代的强烈影响。

  DOI：

  10.1088/0953-8984/1/11/021

文献信息

• Muon spin relaxation in the C15 Laves compounds TaV2 and TaV2H1
  作者：M. Kemali、P.R. Stonadge、D.K. Ross、S.M. Bennington

  DOI：10.1016/0925-8388(95)01826-3

  日期：1995.12

  Muon spin relaxation has been measured using the zero-magnetic-field technique in the C15 Laves phase compounds TaV2 and TaV2H1. At temperatures below 100 K, where the hydrogen atoms are essentially static, the muons are found to diffuse through a tunnelling process. It is also observed that in this temperature range the muons diffuse much more quickly when hydrogen is not present in the sample. As the temperature is raised, a motional narrowing sets in and the muons are believed to change their diffusion process to an over-barrier hopping.
• Ultrasonic evidence for hydrogen tunneling in a Laves-phase material:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TaV</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mi mathvariant="normal">H</mml:mi><mml:mo>(</mml:mo><mml:mi mathvariant="normal">D</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
  作者：J. E. Atteberry、R. G. Leisure、A. V. Skripov、J. B. Betts、A. Migliori

  DOI：10.1103/physrevb.69.144110

  日期：——

  Ultrasonic measurements were performed on the C15 Laves-phase compounds TaV2H0.18, TaV2D0.17, and TaV2D0.50 from low temperatures up to 340 K. The low-temperature end of the measurements was 0.5 K for TaV2H0.18 and 3 K for TaV2D0.17 and TaV2D0.50. In many C15 compounds, including TaV2, hydrogen isotopes occupy the interstitial g sites, which form a network of linked hexagons. For all three materials, a relatively large attenuation peak was observed near room temperature for measurement frequencies in the range of 1 MHz. This peak was associated with H (D) hopping between hexagons, the rate-limiting step for long-range diffusion. Much smaller attenuation peaks were observed for both H and D in each material at low temperatures and attributed to local motion within a hexagon of g sites. These small, low-temperature loss peaks showed totally nonclassical behavior with the H (D) motion exhibiting a very large isotope effect: the relaxation rate for H was over an order of magnitude faster than that for D for similar concentrations. The relaxation rates for the local motion were satisfactorily described by a nonclassical expression with parameters for TaV2D0.50 in agreement with previous NMR measurements for this deuterium concentration. In qualitative agreement with neutron scattering results, it was necessary to assume a temperature-dependent mobile population of H (D) in order to explain the low-temperature attenuation peaks. As further evidence of the nonclassical nature of the motion, the mobile H population was not frozen out on the time scale of the ultrasonic measurements (approximate to1 MHz) down to 1 K. Previously undetected attenuation peaks were observed at an intermediate-temperature range and attributed to an order-disorder transition of the H (D) atoms. It seems likely that this transition is related to the temperature dependence of the mobile population.
• Temperature dependence of the elastic shear modulus of the Laves-phase materials TaV2 and TaV2Hx
  作者：R.G Leisure、K Foster、J.E Hightower、A Ode、A.V Skripov

  DOI：10.1016/s0925-8388(01)01439-6

  日期：2002.1

  Resonant ultrasound spectroscopy has been used to measure the shear modulus of polycrystalline TaV2Hlambda for x = 0, 0.06, 0.10, 0,18, 0.34, and 0.53 over the temperature range of 20-300 K. The results show a strong influence of hydrogen on both the magnitude and the temperature dependence of the shear modulus of these materials. These results are in qualitative agreement with a model involving the electronic structure of these C15 Laves-phase materials. The symmetry of the C15 structure results in doubly-degenerate electronic energy levels at the X point of the Brillouin zone. These levels couple to the shear strain e(4) with resulting effects on the single-crystal elastic constant c(44). The strong temperature and concentration dependence of c(44) contributes to the measured shear moduli of these polycrystalline materials. (C) 2002 Elsevier Science B.V. All rights reserved.
• Shilov; Padurets; Dobrokhotova, Russian Journal of Inorganic Chemistry, <hi>1997</hi>, vol. 42, # 2, p. 136 - 140
  作者：Shilov、Padurets、Dobrokhotova、Kuznetsov

  DOI：——

  日期：——
• Nuclear magnetic resonance study of the electronic structure and hydrogen motion in the random b.c.c.-TaV2-H(D) system
  作者：A.V Skripov、M.Yu Belyaev、A.P Stepanov、L.N Padurets、E.I Sokolova

  DOI：10.1016/0925-8388(93)90395-4

  日期：1993.1

  Nuclear magnetic resonance measurements of the H-1, 2D and V-51 spin-lattice relaxation times and Knight shifts in the random b.c.c.-TaV2Hx(Dx) system (0.1 less-than-or-equal-to x less-than-or-equal-to 2.4) have been performed over the temperature range 11-440 K. The relaxation data are analysed to obtain the parameters of H(D) diffusion, which is governed by a distribution of activation energies. The long-range diffusion of H(D) in b.c.c.-TaV2Hx(Dx) is found to be much faster than in C15-type TaV2Hx(Dx) with comparable H(D) contents. For all the studied samples (including those with mixed isotope composition) there is a distinct isotope effect on the average activation energy: EBAR(a)D > E(a)H. The measured values of the Knight shifts and the electronic (Korringa) contributions to the spin-lattice relaxation rates indicate that the density of d-electron states at the Fermi level decreases with increasing H(D) content.