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

Yasumasa Tomita, Ryo Saito, Ayaka Nagata, Yohei Yamane and Yoshiumi Kohno
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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

Energies, 2020, vol. 13, issue 24, 1-9

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.

Keywords: crystal structure; solid solution; solid electrolyte; Mg ion conductor (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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