The SOFC was constructed using the brush-painting technique the electrode–electrolyte interface characterized by SEM presented good adhesion at 800 ☌. The powder sample of the electrolyte (LSGM) at 1400 ☌ observed by HRTEM indicates that the cubic symmetry Pm-3m is preserved. The electrolyte is chemically compatible with the electrode up to 800 ☌. The best sintering temperature for the electrolyte is 1400 ☌, since at this temperature, LaSrGaO 4 disappears and the percentage of LaSrGa 3O 7 is minimized. The electrolyte (LSGM) is thermally stable up to 800 and from 900 ☌, where the secondary phases of LaSrGa 3O 7 and LaSrGaO 4 appear. The thermal and chemical stability between the electrolyte (LSGM) and the electrode (LSM) were analyzed by dynamic X-ray diffraction as a function of temperature. The characterization by X-ray diffraction of as-prepared powders showed that LSGM and LSM present a perovskite structure and pseudo-cubic symmetry. A half solid oxide fuel cell (SOFC) was then developed using LSGM as an electrolyte and La 0.8Sr 0.2MnO 3 (LSM) as an electrode, both obtained by mechanochemistry. After 60 min of milling, the desired final product was obtained without the need for any subsequent annealing treatment. In this work, a mechanochemical process using high-energy milling conditions was employed to synthesize La 0.8Sr 0.2Ga 0.8Mg 0.2O 3-δ (LSGM) powders from the corresponding stoichiometric amounts of La 2O 3, SrO, Ga 2O 3, and MgO in a short time.
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