M. V. Kalinina, I. G. Polyakova, S. V. Myakin, T. V. Khamova, L. N. Efimova, I. Yu. Kruchinina
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引用次数: 0
Abstract
Xerogels and finely dispersed СeO2–Nd2O3 and Gd2O3–La2O3–SrO–Ni(Co)2O3–δ mesoporous powders are synthesized by cocrystallization of the corresponding nitrate solutions with ultrasonic treatment, and used to prepare nanoceramic materials with a fluorite-like and orthorhombic perovskite crystal structures, respectively, with CSRs of ca. 55–90 nm (1300°C). The physicochemical characterization of the prepared ceramic materials revealed an open porosity of 7–11% for СeO2–Nd2O3 ceramics and 17–42% for Gd2O3–La2O3–SrO–Ni(Co)2O3–δ ceramics. Cerium oxide-based materials possess a predominantly ionic electrical conductivity with σ700°С = 0.31 × 10–2 S/cm (the ion transference number ti = 0.71–0.89 in the temperature range 300–700°C) due to the formation of mobile oxygen vacancies upon heterovalent substitution of Nd3+ for Се4+. Solid solutions based on gadolinium nickelate and gadolinium cobaltite feature a mixed electronic–ionic conductivity (σ700°С = 0.59 × 10–1 S/cm) with the electron and ion transference numbers te = 0.92–0.99 and ti = 0.08–0.01. The prepared ceramic materials are shown to be promising as solid oxide electrolytes and electrodes for medium-temperature fuel cells.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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