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Synthesis, Crystal Structure, and Ionic Conductivity of MgAl 2-x Ga x Cl 8 and MgGa 2 Cl 7 Br

Author

Listed:
  • Yasumasa Tomita

    (Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu City, Shizuoka 432-8561, Japan)

  • Ryo Saito

    (Graduate School of Science and Technology, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu City, Shizuoka 432-8561, Japan)

  • Ayaka Nagata

    (Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu City, Shizuoka 432-8561, Japan)

  • Yohei Yamane

    (College of Industrial Technology, Nihon University, 1-2-1 Izumi-cho, Narashino, Chiba 275-8575, Japan)

  • Yoshiumi Kohno

    (Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1, Johoku, Naka-ku, Hamamatsu City, Shizuoka 432-8561, Japan)

Abstract

MgAl 2-x Ga x Cl 8 and MgGa 2 Cl 7 Br was synthesized from MgCl 2 , MgBr 2 , AlCl 3 , and GaCl 3 , and the physical properties were evaluated by XRD, AC conductivity, and X-ray fluorescence. MgAl 2-x Ga x Cl 8 has the same crystal structure as MgAl 2 Cl 8 , belongs to the space group C2/c, and forms a solid solution in all the synthesized compositions. We attempted to MgGa 2 Cl 8-y Br y synthesize in the same manner as MgAl 2 Cl 8 , but only obtained MgGa 2 Cl 7 Br as a single-phase compound. The AC conductivity of MgAl 2-x Ga x Cl 8 was lowest for MgAl 2 Cl 8 and highest for MgGa 2 Cl 8 . The conductivity of MgGa 2 Cl 8 at 400 K was 1.7 × 10 −6 S/cm. The conductivity of MgGa 2 Cl 7 Br was higher than that of MgAl 2-x Ga x Cl 8 with a value of 1.6 × 10 −5 S/cm at 400 K. The formation of Mg metal was observed at the surface of the cathode electrode in an experiment of flowing a direct current using an electrochemical cell, indicating that this compound is a magnesium ion conductor.

Suggested Citation

  • Yasumasa Tomita & Ryo Saito & Ayaka Nagata & Yohei Yamane & Yoshiumi Kohno, 2020. "Synthesis, Crystal Structure, and Ionic Conductivity of MgAl 2-x Ga x Cl 8 and MgGa 2 Cl 7 Br," Energies, MDPI, vol. 13(24), pages 1-9, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:24:p:6687-:d:464240
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    References listed on IDEAS

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    2. D. Aurbach & Z. Lu & A. Schechter & Y. Gofer & H. Gizbar & R. Turgeman & Y. Cohen & M. Moshkovich & E. Levi, 2000. "Prototype systems for rechargeable magnesium batteries," Nature, Nature, vol. 407(6805), pages 724-727, October.
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