Study of the Structural, Electrical, and Mechanical Properties and Morphological Features of Y-Doped CeO[sub.2] Ceramics with Porous Structure

• Published in: Journal of composites science Vol. 7; no. 10
• Main Authors: Shakirzyanov, Rafael I, Volodina, Natalia O, Kozlovskiy, Artem L, Zdorovets, Maxim V, Shlimas, Dmitriy I, Borgekov, Daryn B, Garanin, Yuriy A
• Format: Journal Article
• Language: English
• Published: MDPI AG 01.10.2023
• Subjects: Ceramic materials; Ceramics; Composition; Materials research; Metallic oxides; Properties; Yttrium; Kazakhstan
• ISSN: 2504-477X; 2504-477X
• DOI: 10.3390/jcs7100411

In this work, ceramic samples of cerium oxide doped with yttrium were investigated. The concentration of a dopant Y(NO[sub.3] )[sub.3] varied from 5 to 25 wt% in the initial charge. In the course of the experiment, a simple method was developed to obtain ceramics with a porosity of ~20% via one-step annealing in air in a muffle furnace. For comparison, samples with two annealings were also synthesized to determine the effects of pores on electrical, structural, and mechanical characteristics. The obtained samples were examined via X-ray powder diffraction, scanning electron microscopy, X-ray energy dispersive spectroscopy, Raman spectroscopy, dielectric spectroscopy, and Vickers microhardness measurements. The substitution of Ce[sup.4+] ions with Y[sup.3+] ions led to a significant decrease in the lattice parameter, average crystallite size, and average grain size, with a simultaneous increase in the lattice defectivity, dielectric constant, electrical conductivity, and microhardness values. It is shown that samples with a dopant weight fraction of 0.05–0.15 and one-step annealing have favorable electrical and mechanical characteristics for energy applications as porous materials with ionic conductivity.