Transition metal doped lanthanum gallates

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

“…4 Following the initial discovery, [1][2][3][4][5] numerous experimental studies have been carried out on LSGM materials, which also include the effect of transition-metal doping. [6][7][8][9][10][11] It is generally believed that doping with a transition metal cation is undesirable for the ionic conductor due to the appearance of n-or p-type conduction. However, it was found that the oxide ion conductivity was also improved by doping Co for Ga in LaGaO 3 -based perovskites, 7 although hole conduction was detected at high oxygen partial pressures.…”

State of Chromium Atoms, Clustering, and Interatomic Interactions in Doped Lanthanum Gallate La(Sr)Ga(Cr,Mg)O3-δ

“…Again in this case much depends on the conditions and methods of the synthesis and also on the very precursors. Aside from the phase of gallate many researchers found admixed phases, such as LaSrGaO 4 and LaSrGa 3 O 7 [8][9][10][11][27][28][29][30][31][32][33][34][35][36][37][38], in all cases where the solubility of strontium is exceeded or close to the limit. By the data of [1] the limit of strontium solubility in LaGaO 3 is 10 at%.…”

“…In the studies of conductivity much attention is being given to lanthanum gallates doped aside from strontium and magnesium with transition elements [4,27,34,35,[42][43][44][45][46][47][48][49][50][51][52][53][54]. In this case we deal with electron-ionic conductors, which are interesting not only from applied point of view, but also from the point of view of fundamental studies.…”

Conductividad mixta en perovskitas de La(Ga,Mg,Nb)O_3-δ

“…Perovskite-like solid solutions derived from lanthanum gallate, LaGaO 3 , are of significant interest for electrochemical applications such as solid oxide fuel cells (SOFCs), oxygen sensors, and ceramic membranes for oxygen separation and partial oxidation of hydrocarbons (1)(2)(3)(4)(5)(6)(7). Among the advantages of LaGaO 3 Ð based solid electrolytes and mixed ionic-electronic conductors are their stability under a wide range of oxygen partial pressures, a high oxygen-ion mobility, and relatively low thermal expansion coefficients (TECs) comparable to that of stabilized zirconia.…”

“…Mg) into the gallium sublattice in order to increase the oxygen-vacancy concentration. Introduction of cations with variable valence, such as cobalt or nickel, into the B sites of the ABO 3 perovskite lattice in La(Sr)Ga(Mg)O 3-δ may also result in greater ionic conductivity (2,3,6). Electronic conduction in LaGaO 3 Ð based oxides also increases with a greater concentration of transition-metal cations (2-7); such doping can, therefore, be considered as a promising strategy for obtaining mixed-conductive materials for oxygen-separation membranes (5)(6)(7).…”