• in situ templating synthesis of conic Ba0.5Sr0.5Co0.8Fe0.2O3–𝛿 perovskite at elevated temperature

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      https://www.ias.ac.in/article/fulltext/boms/032/04/0407-0412

    • Keywords

       

      Perovskite; sol–gel; nitric acid; synthesis; EDTA–citric acid.

    • Abstract

       

      Conic Ba0.5Sr0.5Co0.8Fe0.2O3–𝛿 (BSCF) functional composite oxide was synthesized via a simple in situ templating process. The treatment of the solid precursor with concentrated nitric acid resulted in the mismatch of ionic radius at 𝐴-site and 𝐵-site of the ABO3 perovskite, due to the oxidation of cobalt/iron ions, and the formation of Ba0.5Sr0.5(NO3)2 solid solution. Therefore, instead of the direct formation of BSCF oxide, an intermediate phase of Ba0.5Sr0.5CoO3 (BSC) in hexagonal lattice structure and with conic particle shape was preferentially formed during calcination at low temperature. BSCF perovskite was then produced by the in situ templating of BSC with iron diffusing into the BSC lattice during calcination at high temperature. Wellcrystallized BSCF particles in conic shape were obtained by the calcination of the nitric acid treated precursor at 900°C.

    • Author Affiliations

       

      Wei Zhou1 Ran Ran1 Zongping Shao1 Wanqin Jin1

      1. State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemistry and Chemical Engineering, Nanjing University of Technology, No. 5 Xin Mofan Road, Nanjing 210009, P.R. China
    • Dates

       
  • Bulletin of Materials Science | News

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