Influence of Microwave‐Assisted Pechini Method on La<sub>0.80</sub>Sr<sub>0.20</sub>Ga<sub>0.83</sub>Mg<sub>0.17</sub>O<sub>3–δ</sub> Ionic Conductivity

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<jats:title>Abstract</jats:title><jats:p>With the aim of investigating the microwave influence on the electrolyte material properties, La<jats:sub>0.80</jats:sub>Sr<jats:sub>0.20</jats:sub>Ga<jats:sub>0.83</jats:sub>Mg<jats:sub>0.17</jats:sub>O<jats:sub>2.815</jats:sub> was prepared by both a conventional and a microwave‐assisted sol–gel Pechini method. With respect to the conventional Pechini method (hereafter SGP), the microwave assisted process (hereafter MWA‐SGP) guaranteed a faster procedure, reducing the time needed to remove the excess solvents to complete the polyesterification reaction from some days to a few hours. In fact, when a MWA‐SGP method was used, powders having higher phase purity were obtained. The sintering process at 1,450 °C of the powders prepared by both methods yielded pellets with similar density values (≥92% of theoretical). Nevertheless, only by microwave‐assisted process single‐phase products were obtained and no secondary phases such as tetragonal LaSrGaO<jats:sub>4</jats:sub> and LaSrGa<jats:sub>3</jats:sub>O<jats:sub>7</jats:sub> were detected. These by‐products have been demonstrated to be detrimental for conductivity. Indeed, pellets obtained by MWA‐SGP method showed oxygen ionic conductivity values higher (about 30–40%) than those checked for SGP samples, thus demonstrating the important role of the microwave process on reducing time and costs and on improving the electrolyte properties.</jats:p>

Journal

  • Fuel Cells

    Fuel Cells 12 (1), 54-60, 2012-01-13

    Wiley

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