• Kozlovskiy, Artem
• Volodina, Natalia
• Shlimas, Dmitriy
• Shakirzyanov, Rafael I.
• Garanin, Yuriy
• Borgekov, Daryn
• Zdorovets, Maxim

Abstract

<jats:p>In this work, ceramic samples of cerium oxide doped with yttrium were investigated. The concentration of a dopant Y(NO3)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 Ce4+ ions with Y3+ 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.</jats:p>

Topics

• porous
• impedance spectroscopy
• pore
• grain
• grain size
• scanning electron microscopy
• experiment
• dielectric constant
• Yttrium
• annealing
• porosity
• ceramic
• Raman spectroscopy
• electrical conductivity
• Cerium