Radial X‐Ray Diffraction Study of Superhard Early Transition Metal Dodecaborides under High Pressure

Lei, Jialin; Akopov, Georgiy; Yeung, Michael T.; Yan, Jinyuan; Kaner, Richard B.; Tolbert, Sarah H.

doi:10.1002/adfm.201900293

Title: Radial X‐Ray Diffraction Study of Superhard Early Transition Metal Dodecaborides under High Pressure

Journal Article · Wed Apr 03 00:00:00 EDT 2019 · Advanced Functional Materials

DOI:https://doi.org/10.1002/adfm.201900293· OSTI ID:1504786

Lei, Jialin ^[1]; Akopov, Georgiy ^[1]; Yeung, Michael T. ^[1]; Yan, Jinyuan ^[2]; Kaner, Richard B. ^[3];

^[3]

Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) Los Angeles CA 90095 USA
Advanced Light Source Lawrence Berkeley National Lab Berkeley CA 94720 USA
Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) Los Angeles CA 90095 USA, Department of Materials Science and Engineering University of California, Los Angeles (UCLA) Los Angeles CA 90095 USA, California Nano Systems Institute (CNSI) University of California, Los Angeles (UCLA) Los Angeles CA 90095 USA

Abstract The deformation behavior of the three metal dodecaborides (YB ₁₂ , ZrB ₁₂ , and Zr _0.5 Y _0.5 B ₁₂ ) is investigated using radial X‐ray diffraction under nonhydrostatic compression up to ≈60 GPa with a goal of understanding how bonding and metal composition control hardness. Zr _0.5 Y _0.5 B ₁₂ , which has the highest Vickers hardness ( Hv = 45.8 ± 1.3 GPa at 0.49 N load), also shows the highest bulk modulus ( K ₀ = 320 ± 5 GPa). The 0.49 N hardness for ZrB ₁₂ and YB ₁₂ are both lower and very similar, and both show lower bulk moduli ( K ₀ = 276 ± 7 GPa, and K ₀ = 238 ± 6 GPa, respectively). Differential stress is then measured to study the strength and strength anisotropy. Zr _0.5 Y _0.5 B ₁₂ supports the highest differential stress, in agreement with its high hardness, a fact that likely arises from atomic size mismatch between Zr and Y combined with the rigid network of boron cages. The (200) plane for all samples supports the largest differential strain, while the (111) plane supports the smallest, consistent with the theoretically predicted slip system of {111} [ ]. Strain softening is also observed for ZrB ₁₂ . Finally, the full elastic stiffness tensors for ZrB ₁₂ and YB ₁₂ are solved. ZrB ₁₂ is the most isotropic, but the extent of elastic anisotropy for all dodecaborides studied is relatively low due to the highly symmetric boron cage network.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: DE‐AC02‐05CH11231

OSTI ID:: 1504786

Journal Information:: Advanced Functional Materials, Journal Name: Advanced Functional Materials Vol. 29 Journal Issue: 22; ISSN 1616-301X

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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Cited by: 9 works

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