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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Structural and thermodynamic studies of some hydride forming RM_3-type compounds (R = lanthanide, M = transition metal)
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Structural and thermodynamic studies of some hydride forming RM_3-type compounds (R = lanthanide, M = transition metal)

机译:某些形成氢化物的RM_3型化合物的结构和热力学研究(R =镧系元素,M =过渡金属)

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摘要

Intermetallic compounds RM_n (R=rare earth or transition metal, M=transition metal, n = 1, 2 or 5) are able to store reversibly large amounts of hydrogen and are potential materials for energy storage either by solid-gas or electrochemical routes. Beside these compounds, relatively few works have been devoted to RM_3 compounds since the binary compounds exhibit rather low reversible capacities. New interests for this stoichiometry appear recently with ternary systems R-Mg-Ni (R=Lanthanide, Ca or Y) within the atomic composition 1:2:9. These compounds crystallise in an ordered variant of the PuNi_3-type rhombohedral structure (R 3-bar m space group) and can be described as a stacking of RNi_5 (Haucke phase) and MgNi_2 (Laves phase) units. In this paper, we will review the different structural and thermodynamic properties of RM_3-type compounds. Recent results on new ternary systems will be presented and discussed in relation with other systems.
机译:金属间化合物RM_n(R =稀土或过渡金属,M =过渡金属,n = 1、2或5)能够可逆地存储大量氢,并且是通过固态气体或电化学途径进行能量存储的潜在材料。除了这些化合物之外,由于二元化合物显示出相当低的可逆容量,因此很少有研究致力于RM_3化合物。这种化学计量的新兴趣最近出现在原子组成为1:2:9的三元体系R-Mg-Ni(R =镧系元素,Ca或Y)中。这些化合物以PuNi_3型菱面体结构(R 3-bar m空间基团)的有序变体结晶,可以描述为RNi_5(Haucke相)和MgNi_2(Laves相)单元的堆叠。在本文中,我们将回顾RM_3型化合物的不同结构和热力学性质。关于新的三元系统的最新结果将与其他系统进行介绍和讨论。

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