The influence of sintering temperature on the formation, phase purity, and electrical conductivity of LiMn2O4 has been investigated by means of X-ray diffraction and ac impedance analysis. Higher sintering temperatures lead to increased unit cell constants, more perfect lattices and a higher bulk electrical conductivity. Samples sintered at lower temperatures exhibit higher chemical diffusion coefficients for lithium. Attempts to prepare glassy LiMn2O4-B2O3 have been made. The conduction behaviour of the glass during the crystallization process has been studied. Polycrystalline thin films of LiMn2O4 have been prepared using electron beam evaporation. The temperature dependence of the electrical conductivity of the thin film did not differ substantially from that of bulk material, while the chemical diffusion coefficient for lithium is four orders of magnitude lower than that of samples sintered at 1100 degrees C.