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Volume 134, 2007
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Li+ ionic diffusion and vacancy ordering in β-LiGa

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Abstract

7Li and 71Ga NMR measurements have been performed to study the Li+ ionic motion and vacancy ordering in the lithium semimetal β-LiGa. The temperature dependence of the spin–lattice relaxation rate, T−11 of the 7Li nuclei in the 50 atom% Li sample shows an asymmetric broad peak around 175 K and is interpreted in terms of fast Li+ ionic diffusion. The activation energy of hopping is estimated as 0.11 eV using a non-Debye type relaxation model. In the temperature dependence of T−11 of the 7Li nuclei in 44 and 47 atom% Li samples, steep peaks are observed at 225 and 195 K, respectively. The origin of these anomalous peaks is attributed to the order–disorder transformation of Li+ vacancies. The temperature dependence of T−11 of the 71Ga nuclei measured above 200 K is interpreted in terms of the relaxation originating from the fluctuation of the electric field gradient at the 71Ga nuclei due to mobile Li+ ions. The activation energy for the Li+ ionic diffusion estimated from T−11 of the 71Ga nuclei is comparable with that obtained from T−11 of the 7Li nuclei.

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Publication details

The article was received on 17 Feb 2006, accepted on 15 May 2006 and first published on 08 Aug 2006


Article type: Paper
DOI: 10.1039/B602445A
Citation: Faraday Discuss., 2007,134, 343-352
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    Li+ ionic diffusion and vacancy ordering in β-LiGa

    K. Nakamura, K. Motoki, Y. Michihiro, T. Kanashiro, M. Yahagi, H. Hamanaka and K. Kuriyama, Faraday Discuss., 2007, 134, 343
    DOI: 10.1039/B602445A

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