APS Logo

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.

–

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