Atomistic study of dopant site-selectivity and defect association in the lanthanum gallate perovskite

Sol–gel synthesis and characterization of Co-doped LSGM perovskites

“…Therefore, we infer that Co-doping enhanced oxygen ion mobility and reduced the dopant-vacancy binding energy, 22 thus favouring the overall ion mobility at high temperatures. Fig.…”

Determinación de los números de transporte iónico de materiales basados en el galato de lantano mediante técnicas de espectroscopia de impedancia y FEM

“…respectively is an effective method for enhancing the oxideion conductivity due to the creation of oxygen vacancies in the oxide crystal lattice as indicated in the literature (4). Otherwise, the ionic transport numbers for Co-substituted LaGaO 3 materials decreased as the cobalt content increased,…”

“…In fact, pure LaSrGa 3 O 7 is an insulator, however, the oxide-ionic conductivity in LaSrGa 3 O 7 material has been explained due to an interstitial mechanism considering a different regions with different La/Sr ratios (19), whereas in LSGM material the oxide-ion conductivity has been described by a vacancy mechanism (20). In any case, it is highly recommendable to minimise the formation of LaSrGaO 4 and LaSrGa 3 O 7 impurities during the synthesis of the LSGM material which may seriously affect the performance of LSGM as SOFC electrolyte.…”

“…Substituting Eqs. [4] and [5] into Eq. [3], one obtains: [6] Gorelov proposed studying the emf as a function of an external variable resistance (R M ) closing the circuit (16), see Fig.…”

“…Although, some drawbacks related to the formation of secondary phases e.g. LaSrGaO 4 and LaSrGa 3 O 7 in the course of processing of LaGaO 3 -based materials (2), and the chemical and mechanical compatibility with electrode materials should be overcome (3).…”