Sound velocity and Equation of State of B4C

ORAL

Abstract

B4C, a light weight, impact-resistant, hard material, is used in a variety of applications that exploit these unique properties. However, the material fragments on high-velocity impacts, and laboratory studies provide evidence for pressure-induced amorphization. Si-doping in B4C has been shown to delay the amorphization to higher pressures. To understand this high-pressure performance of B4C, we performed ultrasonic and x-ray diffraction measurements under pressure using several techniques. Using a Paris-Edinburgh cell to investigate the structural and elastic properties of B4C to 7 GPa, we found that the longitudinal acoustic wave increases first with pressure, then flattened above 3 GPa. Complementary x-ray diffraction measurements provided a direct determination of the P-V-T equation of state of both B4C and Si-doped B4C to 3 GPa and 1200 K.

*This work was supported by the DOE/NNSA through the Chicago/DOE Alliance Center (DE-NA0003975).

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Presenters

  • Muhtar Ahart

    • University of Illinois at Chicago
    • Carnegie Inst of Washington
    • University of Illinois Chicago
    • Department of Physics, University of Illinois at Chicago

Authors

  • Muhtar Ahart

    • University of Illinois at Chicago
    • Carnegie Inst of Washington
    • University of Illinois Chicago
    • Department of Physics, University of Illinois at Chicago

  • Charlie M Zoller

    • University of Illinois at Chicago
    • Department of Physics, University of Illinois Chicago

  • Rostislav Hrubiak

    • Argonne National Laboratory
    • HPCAT, X-Ray Science Division, Argonne National Laboratory

  • Curtis Keeney-Benson

    • HPCAT
    • HPCAT, X-Ray Science Division, Argonne National Laboratory

  • Tyrel M McQueen

    • Johns Hopkins University
    • Cornell University
    • Department of Chemistry, Johns Hopkins University

  • Lucas Pressley

    • Department of Chemistry, Johns Hopkins University

  • Maddury Somayazulu

    • Argonne National Laboratory
    • HPCAT, X-Ray Science Division, Argonne National Laboratory

  • Russell J Hemley

    • University of Illinois at Chicago
    • University of Illinois Chicago
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois Chicago
    • Department of Physics and Chemistry, University of Illinois Chicago, 845, W. Taylor Street, Chicago, IL 60607
    • Departments of Physics, Chemistry, and Earth and Environmental Sciences, University of Illinois at Chicago