NMR Study on Defect Structure in β-LiGa

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Author(s)

Abstract

The mechanism of superionic conductivity in β-LiGa has been investigated by ^7Li and ^<71>Ga NMR spin-lattice relaxation rates 1/T_1 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 V_<Li> and through bound Li vacancy trapped by antisite Li_<Ga> have been estimated to be 0.13 and 0.064 eV by applying Bloembergen-Purcell-Pound (BPP) type equation to 1/T_1 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 V_<Li> has been obtained at high temperatures, and evidence for the ordering of V_<Li> has been also detected by anomalies at 200-240K in the temperature dependence of 1/T_1 for ^7Li. However, the motional narrowing observed in ^7Li NMR line width above 110-130K indicates that disorder in V_<Li> can still remain even below its ordering temperature in 44.0 and 47.0 at. % Li samples.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 77(3), "34604-1"-"34604-7", 2008-03-15

    The Physical Society of Japan (JPS)

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Codes

  • NII Article ID (NAID)
    110006633478
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    00319015
  • NDL Article ID
    9421705
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS 
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