Синтез, структура и свойства NdO.3SrO.7Fe1-yCoyO3-δ для создания катодов твердооксидных топливных элементов

Abstract

Polycrystalline perovskites NdO.3SrO.7Fe1-yCoyO3-δ (0.0<y<1.0) were synthesized by a glycerin-nitrate route and characterized by X-ray diffraction, thermogravimetric analysis and dilatometry. The crystal structure of the NdO.3SrO.7Fe1-yCoyO3-δ was described as cubic (sp. gr. Рm3m). The structural parameters were refined using Rietveld full-profile analysis. The introduction of cobalt into the iron sublattice leads to a gradual decrease o f the unit cell parameters and volume. The average thermal expansion coefficients of NdO.3SrO.7Fe1-yCoyO3-δ samples were calculated within the temperature range 298-1273 К in air.