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Apatite-type rare earth silicates/germanates are attracting significant interest as a new class of oxide ion conductors. For the germanates, La 9.33+x (GeO 4 ) 6 O 2+3x/2 , it has been shown that, depending on composition, the cell can be either hexagonal or triclinic, with evidence for reduced low temperature conductivities for the latter, attributed to increased defect...
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