Ionic conductivity-enhancement of LiCl by homogeneous and heterogeneous dopings
Abstract The influence of increasing amounts of MnCl2 on the ionic conductivity of some samples of the system (1-Φ)LiCl-ΦMnCl2 has been investigated for 0≤Φ≤0.33. Two temperature domains have been determined by X-ray diffraction and thermal analysis techniques. At high temperature one observes a LiCl-type solid solution, Li1−2xMnxCl, with a sharp increase of the ionic conductivity versus vacancy rate x, mainly for low values of Φ. At low temperature the solid solution decomposes into LiCl and the double chloride Li2MnCl4. The ionic conductivity of some samples of this intimate mixture of two ionic conductors has been measured and interpreted on the basis of the theories on heterogeneous doping.