Preparation of Strontium‐ and Zinc‐Doped LaGaO 3 Powders via Precipitation in the Presence of Urea and/or Enzyme Urease

Solid oxide fuel cell powders having a composition of La 0.8 Sr 0.2 Ga 0.8 Zn 0.2 O 2.8 (LSGZ) were prepared by aqueous chemical precipitation in the presence of decomposing urea, followed by single‐step calcination in air. In some synthesis experiments the decomposition of urea was catalyzed by the enzyme urease. The calcination behavior of the precursor powders was studied over the temperature range of 90–1300°C, in an air atmosphere. Characterization of the samples was performed by XRD, TG/DTA, FTIR, FESEM, EDS, and carbon analyses. Two tentative XRD patterns have been created for the hydroxycarbonate precursors and the product LSGZ ceramics, respectively.