摘要 采用电弧熔化法合成了A x V 2 Al 20 ( A = Ce, Th, U, Np, Pu; 0.7 ≤ x ≤ 1.0) 锕系金属间化合物的多晶样品。晶体结构研究是通过粉末 X 射线衍射和 Rietveld 精修方法进行的。所有研究的化合物都在 CeCr 2 Al 20 型结构(空间群 Fd-3m,编号 227)中结晶,锕系元素或 Ce 原子位于由 Al 原子形成的超大笼中。将晶体学结果与 LnV 2 Al 20 (Ln = 镧系元素) 对应物的报告数据进行比较,揭示了含镧系元素和含锕系元素的化合物的明显不同的行为。这种差异被认为是由 4 f 电子的相当局部特征引起的,而 5 f 电子的流动特征很可能在含 U 和 Np 的相中看到。
摘要 采用电弧熔化法合成了A x V 2 Al 20 ( A = Ce, Th, U, Np, Pu; 0.7 ≤ x ≤ 1.0) 锕系金属间化合物的多晶样品。晶体结构研究是通过粉末 X 射线衍射和 Rietveld 精修方法进行的。所有研究的化合物都在 CeCr 2 Al 20 型结构(空间群 Fd-3m,编号 227)中结晶,锕系元素或 Ce 原子位于由 Al 原子形成的超大笼中。将晶体学结果与 LnV 2 Al 20 (Ln = 镧系元素) 对应物的报告数据进行比较,揭示了含镧系元素和含锕系元素的化合物的明显不同的行为。这种差异被认为是由 4 f 电子的相当局部特征引起的,而 5 f 电子的流动特征很可能在含 U 和 Np 的相中看到。
The ternary systems: CrAlC, VAlC, and TiAlC and the behavior of H-phases (M2AlC)
作者:J.C. Schuster、H. Nowotny、C. Vaccaro
DOI:10.1016/0022-4596(80)90569-1
日期:1980.4
Phase relationships in the ternarysystemsCrAlC, VAlC, and TiAlC have been investigated. All previously reported ternary H-phaseMe2AlC(Me =Cr, V, Ti) and the perovskite phase Ti3AlC are confirmed. No new ternary phase was found. At 1000°C Ti2AlC and Ti3AlC are coexistent. In addition, the H-phase was found in equilibrium with TiC1−x, TiAl3, and TiAl; the perovskite with TiC1−x, Ti3Al, and Ti (solid
Influence of the V content on microstructure and hardness of high-energy ball milled nanocrystalline Al-V alloys
作者:J. Esquivel、R.K. Gupta
DOI:10.1016/j.jallcom.2018.05.132
日期:2018.9
Abstract Nanocrystalline Al- x V ( x = 0, 0.5, 2, 5, 10 and 20 at. %) alloys were produced by high-energyballmilling (HEBM) followed by consolidation at room temperature under uniaxial pressure of 3 GPa. Grain size, dispersion of the alloying element (V) and formation of solid solution were studied using X-ray diffraction (XRD) analysis and scanning electron microscope (SEM) coupled with energy dispersive
摘要 通过高能球磨 (HEBM) 制备纳米晶 Al-x V ( x = 0, 0.5, 2, 5, 10 和 20 at. %) 合金,然后在 3 GPa 单轴压力下室温固结。使用 X 射线衍射 (XRD) 分析和扫描电子显微镜 (SEM) 结合能量色散 X 射线光谱 (EDXS) 研究晶粒尺寸、合金元素 (V) 的分散和固溶体的形成。高能球磨赋予 V 在 Al 中的纳米晶体结构和高固溶度 - 比热力学预测值高几个数量级。Al-x V 合金的硬度随着 V 含量的增加而增加,高于商业铝合金。
Deduit, J., Annales de Chimie (Cachan, France), 1961, vol. 6, p. 163 - 192
作者:Deduit, J.
DOI:——
日期:——
NMR study of trialuminide intermetallics
作者:Chin-Shan Lue、Suchitra Chepin、James Chepin、Joseph H. Ross
DOI:10.1103/physrevb.57.7010
日期:——
We present a systematic study of the DO22-structure trialuminide intermetallic alloys using Al-27 NMR spectroscopy. The quadrupole splittings, Knight shifts, and spin-lattice relaxation times on Al3Ti, Al3V, Al3Nb, and Al3Ta have been identified. Knight-shift tensors were isolated by observation of quadrupole satellite lines and fitting to the central-transition powder patterns. The results are associated with the local electronic density of states for each crystallographic site. Universally small isotropic Knight shifts and long Tl's are consistent with low Fermi-surface densities of states indicating the importance of Fermi-surface features for the phase stability of these alloys. Larger anisotropic Knight shifts occurring at aluminum site I indicate strong hybridization at this site, and the electric-field-gradient tensors confirm the strong ab plane bonding configuration. Local-moment magnetism is found in Al3V, yet electrically this material appears very similar to the other DO22 aluminides.