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Synthesis and Ultrahigh Pressure Compression of High-Entropy Boride B[sub.2] to 220 GPa

Materials, 2022-12, Vol.16 (1) [Peer Reviewed Journal]

COPYRIGHT 2022 MDPI AG ;ISSN: 1996-1944 ;EISSN: 1996-1944 ;DOI: 10.3390/ma16010158

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  • Title:
    Synthesis and Ultrahigh Pressure Compression of High-Entropy Boride B[sub.2] to 220 GPa
  • Author: Iwan, Seth ; Perreault, Christopher ; Vohra, Yogesh K
  • Subjects: Alloys ; Chemical properties
  • Is Part Of: Materials, 2022-12, Vol.16 (1)
  • Description: The high-entropy boride (Hf[sub.0.2]Mo[sub.0.2]Nb[sub.0.2]Ta[sub.0.2]Zr[sub.0.2])B[sub.2] material was synthesized under high-pressures and high-temperatures in a large-volume Paris-Edinburgh (PE) press from a ball-milled powder mix of HfO[sub.2], MoO[sub.3], Nb[sub.2]O[sub.5,] Ta[sub.2]O[sub.5], ZrO[sub.2], carbon black, and boron carbide. The transformation process was monitored in situ by energy-dispersive x-ray diffraction with conversion starting at 1100 °C and completed by 2000 °C with the formation of a single hexagonal AlB[sub.2]-type phase. The synthesized sample was recovered, powdered, and mixed with platinum pressure marker and studied under high pressure by angle-dispersive x-ray diffraction in a diamond anvil cell. The hexagonal AlB[sub.2]-type phase of (Hf[sub.0.2]Mo[sub.0.2]Nb[sub.0.2]Ta[sub.0.2]Zr[sub.0.2])B[sub.2] was found to be stable up to the highest pressure of 220 GPa reached in this study (volume compression V/V[sub.0] = 0.70). The third order Birch-Murnaghan equation of state fit to the high-pressure data up to 220 GPa results in an ambient pressure unit cell volume V[sub.0]=28.16±0.04Å[sup.3],bulkmodulus K[sub.o] = 407 ± 6 GPa, pressure derivative of bulk-modulus K[sub.0] [sup.′] = 2.73 ± 0.045 GPa. Our study indicates that this high-entropy boride (Hf[sub.0.2]Mo[sub.0.2]Nb[sub.0.2]Ta[sub.0.2]Zr[sub.0.2])B[sub.2] material is stable to ultrahigh pressures and temperatures and exhibit high bulk modulus similar to other incompressible transition metal borides like ReB[sub.2] and Os[sub.2]B[sub.3].
  • Publisher: MDPI AG
  • Language: English
  • Identifier: ISSN: 1996-1944
    EISSN: 1996-1944
    DOI: 10.3390/ma16010158
  • Source: Geneva Foundation Free Medical Journals at publisher websites
    PubMed Central
    ROAD: Directory of Open Access Scholarly Resources
    ProQuest Central
    DOAJ Directory of Open Access Journals
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