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Title: Crystal Field Splitting is Limiting the Stability and Strength of Ultra-incompressible Orthorhombic Transition Metal Tetraborides

Journal Article · · Scientific Reports
DOI:https://doi.org/10.1038/srep23088· OSTI ID:1624825
 [1];  [2];  [3];  [4];  [5];  [6];  [7]
  1. Beihang Univ., Beijing (China). International Research Inst. for Multidisciplinary Science. School of Materials Science and Engineering; Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Theoretical Division; Chinese Academy of Sciences (CAS), Shanxi (China). Inst. of Coal Chemistry. State Key Lab. of Coal Conversion
  3. VSB-Technical Univ. of Ostrava (Czech Republic). IT4 Innovations Center
  4. Beihang Univ., Beijing (China). International Research Inst. for Multidisciplinary Science. School of Materials Science and Engineering
  5. Technical Univ. of Munich (Germany). Dept. of Chemistry
  6. State Univ. of New York (SUNY), Buffalo, NY (United States). Dept. of Chemistry
  7. Carnegie Inst. of Washington, Washington, DC (United States). Geophysical Lab.; Center for High Pressure Science and Technology Advanced Research, Shanghai (China)

The lattice stability and mechanical strengths of the supposedly superhard transition metal tetraborides (TmB4, Tm= Cr, Mn and Fe) evoked recently much attention from the scientific community due to the potential applications of these materials, as well as because of general scientific interests. In the present study, we show that the surprising stabilization of these compounds from a high symmetry to a low symmetry structure is accomplished by an in-plane rotation of the boron network, which maximizes the in-plane hybridization by crystal field splitting between d orbitals of Tm and p orbitals of B. Studies of mechanical and electronic properties of TmB4 suggest that these tetraborides cannot be intrinsically superhard. The mechanical instability is facilitated by a unique in-plane or out-of-plane weakening of the three-dimensional covalent bond network of boron along different shear deformation paths. These results shed a novel view on the origin of the stability and strength of orthorhombic TmB4, highlighting the importance of combinational analysis of a variety of parameters related to plastic deformation of the crystalline materials when attempting to design new ultra-incompressible, and potentially strong and hard solids.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC52-06NA25396
OSTI ID:
1624825
Journal Information:
Scientific Reports, Vol. 6, Issue 1; ISSN 2045-2322
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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