Zur Kenntnis der Chlorid-Spinelle Li2MgCl4, Li2MnCl4, Li2FeCl4, Li2CdCl4 |
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Authors: | H D Lutz W Schmidt H Haeuseler |
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Abstract: | About the Chloride Spinels Li2MgCl4, Li2MnCl4, Li2FeCl4, Li2CdCl4 FIR, Raman, and X-ray data of the spinel type chlorides Li2TCl4 (T = Mg, Mn, Fe, Cd) are presented. The vibrational spectra indicate that there is no 1:1 ordering on the octahedral sites of the lattice. Both DTA measurements and high temperature X-ray photographs show that the chloride spinels undergo a reversible phase transition to a cubic high temperature defect structure at 535°C (Li2MgCl4), 460°C (Li2MnCl4) and 385°C (Li2CdCl4), which has unit cell dimensions two times smaller than the spinel lattice. Disordering of the lithium sublattice still begins at much lower temperatures, as measurements of the electric conductivity indicate. |
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