Аннотации:
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.
