日本結晶学会誌
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連載企画 対称性と群論(4)
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  • 森 一広, 米村 雅雄, 福永 俊晴
    59 巻 (2017) 5 号 p. 230-237
    公開日: 2017/11/03
    ジャーナル フリー

    Designing the next generation of lithium ion batteries (LIBs) requires fundamental information that surprisingly often is still unknown-for example, details of how ions actually move through a working device. Li7P3S11 crystal and (Li2S)x(P2S5100-x glasses have received a great deal of attention as a solid electrolyte for all-solid-state LIBs because of its extremely high ionic conductivity of 10-4 to 10-2 S/cm at room temperature. The authors predict and visualize the conduction pathways of Li ions in Li7P3S11 crystal and (Li2S)x(P2S5100-x glasses, using reverse Monte Carlo (RMC) modeling and the bond valence sum (BVS) approach with neutron diffraction data. The conduction pathways of Li ions can be classified into two types: relatively “stable” regions and “metastable” regions for Li ions. Furthermore, the authors use quasielastic neutron scattering to directly monitor the fast diffusion of Li ions in Li7P3S11 crystal. According to the jump diffusion model, Li ions migrate between stable regions within a jump length <l>=4.3 Å along conduction pathways.

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  • 筒井 智嗣
    59 巻 (2017) 5 号 p. 238-245
    公開日: 2017/11/03
    ジャーナル フリー

    We have applied inelastic X-ray scattering (IXS) technique to observing phonon spectra in rare-earth compounds. IXS technique has an advantage to inelastic neutron scattering to avoid seeing magnetic excitations, which are often observed in the low energy spectra of rare-earth compounds. In this review, we mentioned IXS results of filled skutterudite compounds. In a series of ROs4Sb12, we have discussed electron phonon coupling in low-lying optical modes, which is connected with heavy fermion behavior in these compounds. In an alloy system of Pr(Os1-xRux4Sb12, we have discussed anharmonic potential at the rare-earth site which may be affect by nature of superconductivity and/or heavy fermion behavior.

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