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    Crystallography of Chevrel Phases, MMo<sub>6</sub>T<sub>8</sub> (M = Cd, Na, Mn, and Zn, T = S, Se) and Their Cation Mobility by E. Levi (2349337)

    Published 2009
    “…In spite of extensive studies of these materials, the origin of their high ionic mobility remained unclear. In a previous paper we presented for the first time a proper classification of the very complex transport behavior of different cations in the Mo<sub>6</sub>T<sub>8</sub> hosts: (i) apparent immobility of the large M cations such as Pb<sup>2+</sup>, Sn<sup>2+</sup>, Ag<sup>+</sup> in the ternary phases, MMo<sub>6</sub>T<sub>8</sub>; (ii) coupled M+M′ diffusion in the quaternary phases, M<sub><i>x</i></sub>M′<sub><i>y</i></sub>Mo<sub>6</sub>T<sub>8</sub>, where both large and small cations can assist; (iii) cation trapping in the Mg−Mo<sub>6</sub>S<sub>8</sub>, Cd−Mo<sub>6</sub>S<sub>8</sub>, and Na−Mo<sub>6</sub>T<sub>8</sub> systems; (iv) a combination of low- and high-rate diffusion kinetics at the first and last intercalation stages, respectively, for the Cu−Mo<sub>6</sub>S<sub>8</sub>, Mn−Mo<sub>6</sub>S<sub>8</sub>, and Cd−Mo<sub>6</sub>Se<sub>8</sub> systems, and (v) a fast ionic transport for small cations such as Ni<sup>2+</sup>, Zn<sup>2+</sup>, and Li<sup>+</sup>. …”
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