Ce0.8Y0.2O2–δ — Effect of Production Method on Structure and Electrophysical Properties

• Published in: Glass and ceramics 2022-11, Vol.79 (7-8), p.323-329
• Main Authors: Sudzhanskaya, I. V., Vasil’ev, A. E., Yapryntsev, M. N., Nekrasova, Yu. S., Oleinik, A. N.
• Format: Article
• Language: English
• Subjects: Ceramics; Characterization and Evaluation of Materials; Chemical synthesis; Chemistry and Materials Science; Composites; Crack propagation; Cubic lattice; Electrical resistivity; Fluorite; Glass; Glycine; Grain boundaries; Materials Science; Microhardness; Natural Materials; Production methods; Sol-gel processes; Solid phases; Solid solutions
• ISSN: 0361-7610; 1573-8515
• DOI: 10.1007/s10717-022-00507-z

The solid solution Ce 0.8 Y 0.2 O 2–δ was obtained by three methods: sol-gel, glycine-nitrate, and solid-phase reactions. The synthesis temperature was 1350°C for the sol-gel method and 1500°C for the remaining samples. The x-ray method showed that all samples have a cubic lattice with fluorite structure. The microstructure, density, electrical conductivity, microhardness, and crack resistance of the resulting ceramics were studied. It was found by means of impedance spectroscopy that the Ce 0.8 Y 0.2 O 2–δ system obtained by the sol-gel method has the highest electrical conductivity, 5.37 mS/cm at 550°C, and the lowest activation energy, equal to 0.83 eV in the temperature range of 300 – 550°C. The contribution made to the conductivity by grains and grain boundaries is determined. It is shown that the total conductivity for all samples decreases due to the resistance along the grain boundaries.