Abstract
The solid solutions CeO2–(Sm,Nd)2O3 have been prepared by the solid-phase synthesis. The microstructure, density, and electrical conductivity of ceramic samples obtained by rolling with an organic binder, followed by sintering in air at a temperature of 1600°C have been investigated. The contributions to the total conductivity from the grain volume and grain boundaries in the temperature range of 250–700°C have been separated using impedance spectroscopy. The impedance spectroscopy data have revealed a significant effect of grain boundaries on the transport properties of the solid electrolyte with a Sm dopant as compared to the electrolyte with Nd. The optical properties of the polycrystalline electrolytes Ce1–x Nd x O2–δ and Ce0.8Sm0.2O2–δ have been studied using Raman spectroscopy. In the spectrum of the ceramic samples, there are two modes: a mode of CeO2 at a frequency of 465 cm–1 and an additional mode at a frequency of ~550 cm–1 due to vibrations associated with oxygen vacancies, the intensity of which depends on the dopant concentration and the energy of the dopant cation–oxygen vacancy bond. The binding energy of oxygen vacancies in the fluorite structure correlates with the behavior of bulk conductivity, and the solid solutions with samarium exhibit the highest bulk conductivity.
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Original Russian Text © V.V. Sal’nikov, E.Yu. Pikalova, 2015, published in Fizika Tverdogo Tela, 2015, Vol. 57, No. 10, pp. 1895–1903.
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Sal’nikov, V.V., Pikalova, E.Y. Raman and impedance spectroscopic studies of the specific features of the transport properties of electrolytes based on CeO2 . Phys. Solid State 57, 1944–1952 (2015). https://doi.org/10.1134/S1063783415100261
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DOI: https://doi.org/10.1134/S1063783415100261