The ionic conductivities (complex impedance measurements) of the olivine type Li 2 ZnCl 4 , Na 2 ZnCl 4 and Na 2 CoCl 4 , the Sr 2 PbO 4 type Na 2 MgCl 4 , Na 2 MnCl 4 , and Na 2 CdCl 4 , and the novel Na 2 CrCl 4 with monoclinically distorted Sr 2 PbO 4 structure (Na 2 CuF 4 type) are presented. The specific conductivities of Li2ZnCl4 and the Na2MCl4 are about three orders of magnitude lower than those of the fast ionic conducting lithium chloride spinels Li[LiM ]Cl 4 (M = Mg, Mn. Fe. Cd. etc.) indicating that in the latter compounds the tetrahedrally coordinated lithium ions exhibit higher mobility than those on octahedral sites. The X-ray data including those of Sr 2 PbO 4 type Na 2 TiCl 4 and both the IR and Raman spectra (together with a group theoretical treatment) are also given. The spectra obtained confirm the different structure types of the ternary chlorides.
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Lutz et al. (1987) studied this question.