Quasi-High Entropy Oxide Ca(ZrYCeCr)Oxsynthesized By Sol-Gel Process

Quasi-High Entropy Oxide is composed of Ca, Zr, Y, Ce, and Cr, which are synthesized via sol-gel method at room temperature. These metallic nitrates, including calcium nitrate, zirconium nitrate, yttrium nitrate, cerium nitrate, and chromium nitrate are mixed together to prepare the precursor and stirring for one four. After thoroughly mixing, adding citric acid as a chelating agent to link all kinds of metal ions together as chelates. Then, adjusting the pH value to 7 by adding ammonia solution, and drying at 90oC for 48-hour. After that, the as-synthesized dried powders were annealed at 1100oC for three-hour to obtain the final product. The x-ray diffraction pattern indicates that as-synthesized powders of CaZrYCeCrOxdemonstrated a single-phase fluorite structure with precipitating the second phase of CaZrO3, which exhibited luminescence and ferroelectric properties. Notably, based on the transmission electron microscope images, the as-synthesized CaZrYCeCrO nanoparticles display highly porous morphologies, implying that the CaZrYCeCrO may highly potential for the application of the electrochemical reactions.