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X-Ray and Electron Microscopic Confirmation of the Existence of the MoCd 2 Phase in Film Coatings of the Molybdenum–Cadmium System
Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques Pub Date : 2020-07-07 , DOI: 10.1134/s1027451020030428
V. N. Volodin , Y. Zh. Tuleushev , E. A. Zhakanbaev , K. V. Tcai

Abstract

Using ion-plasma sputtering and the co-precipitation of superdispersed particles of Mo and Cd, solid solutions—alloys with a concentration of up to 57.3 at % Cd in a film—are produced for the first time, which confirms the thermal-fluctuation melting and coalescence of small particles. During the formation of coatings by molybdenum and cadmium nanolayers with a thickness of less than 2 nm in the concentration range 60—66 at % Cd, a new phase identified as MoCd2 is detected; it is obtained directly in the process of film-coating formation and has a tetragonal face-centered cubic lattice with the parameters a = 0.78231 nm and c = 0.77039 nm. Radiographic data for identification of the intermetalloid are determined. The MoCd2 unit cell is constructed. As cadmium accumulates in the lattice, it first replaces the molybdenum atom in the center of the unit cell; then, another cadmium atom becomes embedded in the molybdenum lattice, replacing the atom at one of the cube vertices and this process is accompanied by transformation of the cell type from cubic to tetragonal, where cadmium atoms are embedded pairwise at the side faces of the cell in the MoCd2 compound. The thermal resistance of the intermetalloid is limited by 200°C. The synthesized MoCd2 phase has a conductivity of metallic type.


中文翻译:

X射线和电子显微镜确定钼镉系统薄膜涂层中MoCd 2相的存在

摘要

使用离子等离子体溅射和Mo和Cd超分散颗粒的共沉淀,首次生产了固溶体(膜中Cd浓度最高为57.3 at%的合金),这证实了热波动熔化和小颗粒的聚结。在60-66 at at Cd浓度范围内,由厚度小于2 nm的钼和镉纳米层形成涂层时,检测到新相MoCd 2。它直接在成膜过程中获得,并具有一个四边形的面心立方晶格,其参数a = 0.78231 nm和c = 0.77039 nm。确定用于鉴别金属间化合物的射线照相数据。MoCd 2构造了晶胞。随着镉在晶格中的积累,它首先取代了晶胞中心的钼原子;然后,另一个镉原子嵌入到钼晶格中,取代了其中一个立方顶点的原子,并且此过程伴随着细胞类型从立方到四方的转变,其中镉原子成对地嵌入在电池的侧面在MoCd 2化合物中。金属间化合物的热阻受200°C的限制。合成的MoCd 2相具有金属型导电性。
更新日期:2020-07-07
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