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Recently, apatite-type phases, e.g., La 10-x (Si/Ge) 6 O 26+y , have been attracting significant interest due to their high oxide ion conduction. Studies of the Ge-based systems have, however, shown them to suffer from problems related to Ge loss at the high sintering temperatures required to obtain dense pellets. In addition, the activation energy...
Apatite-type oxides of general formula (La/Sr) 10-x Si 6 O 26+y have been attracting considerable interest recently, because of their observed high oxide ion conductivity. In this paper, we report the effects on the conductivity of Ga doping at the Si site. For samples that are nominally stoichiometric in oxygen, La 9.33 ...
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