Influence of Ba Doping on the Electrical Behaviour of La0.9Sr0.1Al0.9Mg0.1O3−δ System for a Solid Electrolyte

Recent Progress in the Design, Characterisation and Application of LaAlO3- and LaGaO3-Based Solid Oxide Fuel Cell Electrolytes

“…For the synthesis of doped LaAlO 3 oxides, several well-developed techniques are usually used: solid-state reaction technology [61][62][63][64], the mechanochemical route [65], co-precipitation [66,67] and organic-nitrate precursor pyrolysis [68][69][70][71][72][73][74][75].…”

“…The most widely used technology for the preparation of LaAlO 3 and its doped derivatives is the pyrolysis of organic-nitrate compositions, known as the sol-gel [68,69,74] or autocombustion methods (or self-propagating high-temperature synthesis, and the Pechini method) [70][71][72][73]75]. Utilizing different fuels during the pyrolysis process coupled with various annealing temperatures affects the crystallinity, powder dispersity, and ceramics density, determining the functional properties of the obtained LaAlO 3 -based ceramic materials [74,76,77].…”

“…Verma et al [71] synthesized LaAlO3 and La0.9−xSr0.1BaxAl0.9Mg0.1O3−δ (x = 0.00, 0.01 and 0.03) samples from initial reagents composed of La(NO3)3•H2O, Sr(NO3)2, Ba(NO3)2, Al(NO3)3•6H2O and Mg(NO3)2•6H2O initial reagents. C6H8O7•H2O was used as an organic fuel.…”

“…The obtained powders were calcined at 700 °C for 4 h, then pressed into pellets and sintered at 1300 °C for 8 h to achieve 92-to-96% relative density, depending on the aluminate composition. Reproduced from [71] with permission from Springer Nature (Berlin/Heidelberg, Germany), 2021; (b) XRD patterns for LaAlO 3 powders prepared and calcined at a temperature range of 600-900 • C for 1 h on each stage. Reproduced from [66] with permission by Elsevier Ltd., 2013; (c) pore size distributions of LaAlO 3 powder bodies calcined at 900 • C for 2 h. Reproduced from [66] with permission by Elsevier Ltd., 2013; (d) TEM image of LaAlO 3 powder calcined at 900 • C for 2 h. Reproduced from [66] with permission by Elsevier Ltd., 2013.…”

“…The possibility of forming good oxygen-ionic conductivity by doping LaAlO 3 oxides has promoted studies on their potential application in SOFCs [53,65,71,[82][83][84][85][86][87][88][89][90]. The codoping strategy is a beneficial way to further increase ionic conductivity [80,82,83,87]; this is due to the fact that, along with Equation (2), an additional quantity of oxygen vacancies can be formed according to the following mechanism [80]:…”