NMR Study on Defect Structure in β-LiGa

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  • Nishioka Daisuke
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Nakamura Koichi
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Michihiro Yoshitaka
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Ohno Takashi
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Kanashiro Tatsuo
    Department of Quantum Materials Science, Institute of Technology, The University of Tokushima
  • Kuriyama Kazuo
    College of Engineering and Research Center of Ion Beam Technology, Hosei University
  • Hamanaka Hiromi
    College of Engineering and Research Center of Ion Beam Technology, Hosei University
  • Yahagi Masahito
    Faculty of Engineering, Aomori University

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  • NMR study on defect structure in v LiGa

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The mechanism of superionic conductivity in β-LiGa has been investigated by 7Li and 71Ga NMR spin–lattice relaxation rates 1⁄T1 in Li excess 50.0 at. %, Li deficient 44.0 and 47.0 at. % samples. The activation energies of Li+ ionic diffusions through free Li vacancy VLi and through bound Li vacancy trapped by antisite LiGa have been estimated to be 0.13 and 0.064 eV by applying Bloembergen–Purcell–Pound (BPP) type equation to 1⁄T1 in 50.0 at. % Li sample. In Li deficient samples, the same activation energy, 0.11–0.13 eV, for Li+ ionic diffusion through free VLi has been obtained at high temperatures, and evidence for the ordering of VLi has been also detected by anomalies at 200–240 K in the temperature dependence of 1⁄T1 for 7Li. However, the motional narrowing observed in 7Li NMR line width above 110–130 K indicates that disorder in VLi can still remain even below its ordering temperature in 44.0 and 47.0 at. % Li samples.

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