Abstract
Abstract Chromium-deficient Nd 0.75 Sr 0.25 Cr 1− δ O 3 (0.02 ≤ δ ≤ 0.06) solid solutions were prepared using a conventional solid-state reaction. The effects of chromium-deficiency content on sintering, transport properties and thermal expansion of the solid solutions were investigated. The results showed that all the solid solutions present single phase orthorhombic perovskite structure at room temperature. The cell volume and the electrical conductivity of Nd 0.75 Sr 0.25 Cr 1− δ O 3 solid solutions decrease with the increase of Cr vacancy content. The Nd 0.75 Sr 0.25 Cr 0.98 O 3 sample exhibits the best properties. The relative density is 95.5%, and the electrical conductivity and thermal expansion coefficient (TEC) reach 18.8 S cm −1 at 850 °C and 9.62 × 10 −6 K −1 in the temperature range of 30–1000 °C in air, respectively. Compared with Nd 0.75 Sr 0.25 CrO 3 , TEC of the Nd 0.75 Sr 0.25 Cr 0.98 O 3 sample is more compatible with that of yttria stabilized zirconia (10.3 × 10 −6 K −1 ). Sintering, electrical and thermal expansion properties all indicate that Nd 0.75 Sr 0.25 Cr 0.98 O 3 can be a promising candidate for interconnect material application in solid oxide fuel cells.
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