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For the first time the local structure of Al- and Fe-doped apatite-type lanthanum silicates (ATLS) of different stoichiometries was systematically studied by using IR spectroscopy. In addition to previous 29 Si MAS NMR study, data obtained confirm the possibility of [SiO 4 ] group interaction in ATLS, being favored by the presence of cation vacancies in the apatite. Transport properties...
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