中国物理B ›› 2012, Vol. 21 ›› Issue (7): 76103-076103.doi: 10.1088/1674-1056/21/7/076103

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

The ground-state structure and physical properties of RuC: first-principles calculations

张美光a, 闫海燕b, 张刚台a, 王晖c   

  1. a Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China;
    b Shaanxi Key Laboratory for Phytochemistry, Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China;
    c National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
  • 收稿日期:2011-10-19 修回日期:2012-03-21 出版日期:2012-06-01 发布日期:2012-06-01
  • 基金资助:
    Project supported by Baoji University of Arts and Sciences Key Research, China (Grant Nos. ZK1032, ZK11060, ZK11061 and ZK11146) and the Phytochemistry Key Laboratory of Shaanxi Province, China (Grant No. 11JS008).

The ground-state structure and physical properties of RuC: first-principles calculations

Zhang Mei-Guang(张美光)a)†, Yan Hai-Yan(闫海燕)b), Zhang Gang-Tai(张刚台)a), and Wang Hui(王晖) c)‡   

  1. a Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China;
    b Shaanxi Key Laboratory for Phytochemistry, Department of Chemistry and Chemical Engineering, Baoji University of Arts and Sciences, Baoji 721013, China;
    c National Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
  • Received:2011-10-19 Revised:2012-03-21 Online:2012-06-01 Published:2012-06-01
  • Contact: Zhang Mei-Guang, Wang Hui E-mail:zhmgbj@126.com;huiwang@jlu.edu.cn
  • Supported by:
    Project supported by Baoji University of Arts and Sciences Key Research, China (Grant Nos. ZK1032, ZK11060, ZK11061 and ZK11146) and the Phytochemistry Key Laboratory of Shaanxi Province, China (Grant No. 11JS008).

摘要: We have extensively explored the ground-state structure of RuC using the particle swarm optimization algorithm for crystal structural prediction. A hexagonal R-3m structure has been proposed as the best candidate, which is energetically more favorable than the previously proposed zinc blend structure. The R-3m-RuC possesses alternative stacking of double hexagonal close-packed Ru atom layers and C atom layers, and it is dynamically stable evidenced by the calculation of phonon dispersion. The calculated large bulk modulus, shear modulus, and elastic constant C44 reveal that it is an ultra-incompressible and hard material. The evidence of strong covalent bonding of Ru--C, which plays an important role to form a hard material, is manifested by the partial densities of states analysis.

关键词: transition metal carbides, structure prediction, ultra-incompressible material

Abstract: We have extensively explored the ground-state structure of RuC using the particle swarm optimization algorithm for crystal structural prediction. A hexagonal R-3m structure has been proposed as the best candidate, which is energetically more favorable than the previously proposed zinc blend structure. The R-3m-RuC possesses alternative stacking of double hexagonal close-packed Ru atom layers and C atom layers, and it is dynamically stable evidenced by the calculation of phonon dispersion. The calculated large bulk modulus, shear modulus, and elastic constant C44 reveal that it is an ultra-incompressible and hard material. The evidence of strong covalent bonding of Ru--C, which plays an important role to form a hard material, is manifested by the partial densities of states analysis.

Key words: transition metal carbides, structure prediction, ultra-incompressible material

中图分类号:  (Inorganic compounds)

  • 61.66.Fn
61.50.Ah (Theory of crystal structure, crystal symmetry; calculations and modeling) 62.20.de (Elastic moduli)