Strategies for the optimisation of the oxide ion conductivities of apatite-type germanates
Recently, apatite-type germanates La9.33+xGe 6O26+3x/2 have attracted considerable interest due to their high oxide ion conductivities. Research has shown that the key defects are oxide ion interstitials which lead to the conversion of some of the GeO4 units to GeO5. Consequently there has been a large interest in the preparation of high oxygen excess samples with high defect concentration. This strategy, however, leads to a reduction in symmetry from hexagonal to triclinic for x>0.4, and...[Show more]
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