Preparation of Submicron Strontium Sodium Zirconate Powder in Alkaline Solutions
Source abstract
Abstract
Fine-particle (Sr,Na)ZrO3 was prepared by boiling a suspension of zirconium and strontium hydroxides in concentrated NaOH and was characterized by powder x-ray diffraction, thermogravimetry, IR spectroscopy, scanning electron microscopy, and x-ray microanalysis. Its structure was refined by the Rietveld method. (Sr,Na)ZrO3 has an orthorhombically distorted perovskite (ABO3) structure, with the Sr2+ and Na+ ions in the A site and Zr4+ in the B site. The relative A- and B-site occupancies are 100 and 79%, respectively. The cation deficiency is compensated by OH groups, which contain about one-third of the oxygens. In the range 100–900°C, (Sr,Na)ZrO3 loses water but retains the perovskite structure (with reduced lattice parameters). The synthesized powder consists of ≃40-nm particles, which form micron-sized spherical aggregates. The aggregates retain their shape during annealing at temperatures of up to 1000°C.
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OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Electronic and Structural Properties of Oxides · Thermal Expansion and Ionic Conductivity
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References (12)
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