Interstitial Oxide Ion Conductivity in the Langasite Structure: Carrier Trapping by Formation of (Ga,Ge)₂O₈ Units in La₃Ga_5-x Ge_1+x O_14+x/2 (0 < x ≤ 1.5).

ABSTRACT: Framework oxides with the capacity to host mobile interstitial oxide anions are of interest as electrolytes in intermediate temperature solid oxide fuel cells (SOFCs). High performance materials of this type are currently limited to the anisotropic oxyapatite and melilite structure types. The langasite structure is based on a corner-shared tetrahedral network similar to that in melilite but is three-dimensionally connected by additional octahedral sites that bridge the layers by corner sharing. Using low-temperature synthesis, we introduce interstitial oxide charge carriers into the La₃Ga_5-x Ge_1+x O_14+x/2 langasites, attaining a higher defect content than reported in the lower dimensional oxyapatite and melilite systems in La

SUBMITTER: Diaz-Lopez M 

PROVIDER: S-EPMC7011757 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature