Composition-Oxygen Partial Pressure Diagram of the Cr-B-O Ternary System Based on the Standard Gibbs Energies of Formation of CrB₄, CrB₂, Cr₃B₄, Cr₅B₃ and CrBO₃ Determined by Solid Electrolyte

  • Yamamoto Hiroaki
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
  • Taniguchi Yoshitsugu
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
  • Nishiyama Kazuto
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
  • Wada Yoshitaka
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
  • Shibata Kohei
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
  • Nozaki Ai
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo
  • Morishita Masao
    Department of Chemical Engineering and Materials Science, Graduate School of Engineering, University of Hyogo

書誌事項

タイトル別名
  • Composition–Oxygen Partial Pressure Diagram of the Cr–B–O Ternary System Based on the Standard Gibbs Energies of Formation of CrB<sub>4</sub>, CrB<sub>2</sub>, Cr<sub>3</sub>B<sub>4</sub>, Cr<sub>5</sub>B<sub>3</sub> and CrBO<sub>3</sub> Determined by Solid Electrolyte

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説明

<p>The standard Gibbs energies of formation, ΔfGo, of CrB4, CrB2, Cr3B4, Cr5B3, and CrBO3 existing along the oxidation path of Cr–B binary alloy were determined using the electromotive forces of galvanic cell composed of the ZrO2–Y2O3 solid electrolyte. The electromotive force showed plateaus and decreases in the process that CrB4–CrB2 two-phase alloy used for the cell materials were oxidized via two- and three-phase regions along its oxidation path. From the plateaus of electromotive forces corresponding to the cell materials in the three-phase regions, the values of ΔfGo(CrB4), ΔfGo(CrB2), ΔfGo(Cr3B4), ΔfGo(Cr5B3), and ΔfGo(CrBO3) in the temperature range from 1273 to 1346 K were determined as follows:</p><p>ΔfGo(CrB4)/J (mol of compd.)−1 = 167500 − 261.2 T ± 7200</p><p>ΔfGo(CrB2)/J (mol of compd.)−1 = −21020 − 79.22 T ± 2100</p><p>ΔfGo(Cr3B4)/J (mol of compd.)−1 = −173400 − 95.47 T ± 2500</p><p>ΔfGo(Cr5B3)/J (mol of compd.)−1 = −318900 + 20.64 T ± 5800</p><p>ΔfGo(CrBO3)/J (mol of compd.)−1 = −958800 + 59.24 T ± 4100</p><p>The ΔfGo values determined in the present study satisfied the phase equilibria in the Cr–B binary system. Using the determined ΔfGo values, the composition-oxygen partial pressure diagram of the Cr–B–O system was constructed under the conditions at 1300 K and a total pressure of 1 bar (100 kPa). It is useful to understand the oxidation property of the Cr–B binary alloys.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 62 (6), 821-828, 2021-06-01

    公益社団法人 日本金属学会

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