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首页> 外文期刊>Zeitschrift fur Naturforschung, B. A Journal of Chemical Sciences >V18P9C2: a complex phosphide carbide
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V18P9C2: a complex phosphide carbide

机译：V18P9C2：复杂的碳化磷

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摘要

V18P9C2 crystallizes in the orthorhombic space group Pmma with the lattice parameters a = 17.044(3), b = 3.2219(7), and c = 13.030(2) angstrom, Z = 2. The crystal structure is composed of 19 symmetry-independent atoms. The crystal structure is considered as a network formed by the transition metal atoms exhibiting cubic, trigonal prismatic, and octahedral voids centered by V, P, and C atoms, respectively. Vice versa, the V and P atoms form a three-dimensional network. The two CV6 octahedra are edge-and corner-connected to chains running parallel to [010]. The five unique P atoms are trigonal prismatically coordinated by V atoms with one to three faces capped again by a V atom. The V atoms have mainly cubic environments formed solely by V or by V and P atoms. V18P9C2 exhibits some structural relations to other compounds of the ternary system V-P-C as well as to other intermetallic phases. Despite the low carbon content, V18P9C2 is considered as a ternary compound rather than an interstitially stabilized (binary) phosphide in view of its special structural features.
机译：V18P9C2在正交晶空间群Pmma中结晶，晶格参数为a = 17.044（3），b = 3.2219（7）和c = 13.030（2）埃，Z =2。晶体结构由19个独立于对称的原子组成。晶体结构被认为是由过渡金属原子形成的网络，这些过渡金属原子分别以V，P和C原子为中心呈现立方，三棱柱形和八面体空隙。反之亦然，V和P原子形成三维网络。两个CV6八面体边缘连接到与[010]平行的链上。五个独特的P原子与V原子呈三棱柱形配向，其中一到三个面再次被V原子覆盖。 V原子主要具有仅由V或由V和P原子形成的立方环境。 V18P9C2与三元体系V-P-C的其他化合物以及其他金属间相具有某些结构关系。尽管碳含量低，但鉴于其特殊的结构特征，V18P9C2被认为是三元化合物，而不是间隙稳定的（二元）磷化物。

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