Ionic Conductivity, Structural, IR and Raman Spectroscopic Data of Olivine, Sr2PbO4, and Na2CuF4 Type Lithium and Sodium Chlorides Li2ZnCl4 and Na2MCl4 (M = Mg, Ti, Cr, Mn, Co, Zn, Cd)

Abstract

The ionic conductivities (complex impedance measurements) of the olivine type Li2ZnCl4, Na2ZnCl4 and Na2CoCl4, the Sr2PbO4 type Na2MgCl4, Na2MnCl4, and Na2CdCl4, and the novel Na2CrCl4 with monoclinically distorted Sr2PbO4 structure (Na2CuF4 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 ]Cl4 (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 Sr2PbO4 type Na2TiCl4 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.