A new bromide spinel has been found in the system. The orthorhombic cell dimensions are , , and at room temperature. The electrical conductivities of the new bromide spinel and the related spinel have been measured. and have been found to have high ionic conductivities of and at 400°C, respectively. High temperature x‐ray diffraction analysis indicates a phase transition from a distorted structure to a cubic structure around 300°C for and around 270°C for . Electrical conductivity measurements suggest that the transitions correspond to those from the low to high ionic conductivity phase. A solid solution is observed on substitution of lithium ions for Mg 2+ or Mn 2+ ions. The substitution leads to higher ionic conductivity only for the cubic spinel. No significant composition dependence of the conductivity or the activation energy for conduction has been observed in the distorted structures.
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Kanno et al. (1986) studied this question.