4.7 Article

Possible Superhardness of CrB4

Journal

INORGANIC CHEMISTRY
Volume 52, Issue 2, Pages 540-542

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ic3020404

Keywords

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Funding

  1. National Science Foundation through the MRSEC Program [NSF DMR-1121053]
  2. ConvEne-IGERT Program [NSF-DGE 0801627]
  3. Alexander von Humboldt Foundation
  4. German Academic Exchange Service
  5. Division Of Materials Research
  6. Direct For Mathematical & Physical Scien [0843934] Funding Source: National Science Foundation

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Chromium tetraboride [orthorhombic, space group Pnnm (No. 58), a = 474.65(9) pm, b = 548.0(1) pm, c = 286.81(5) pm, and R value (all data) = 0.041], formerly described in space group Immm, was found not to be superhard, despite several theory-based prognoses. CrB4 shows an almost temperature-independent paramagnetism, consistent with low-spin Cr-I in a metallic compound. Conductivity measurements confirm the metallic character.

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