Synthesis, Crystal Structure, and Properties of NdNi 0.5 Mn 0.5 O 3−δ – A Possible Cathode Material for IT-SOFCs

Abstract

The crystal structure and properties of NdNi 0.5 Mn 0.5 O 3−δ were studied in the temperature range of 25–1000 ∘ C in air. The perovskite-like monoclinic crystal structure (P2 1 /n) was stable at all studied temperatures. NdNi 0.5 Mn 0.5 O 3−δ exhibited moderate thermal expansion with linear thermal expansion coefficient of 10.12 × 10 −6 K −1 (200–1000 ∘ C). Oxygen non-stoichiometry was almost temperature-independent in the whole temperature range studied with absolute value of 0.15 at room temperature. Total conductivity of the oxide was shown to be thermally activated with activation energy of 0.45 eV (350–1000 ∘ C) and the maximal value of 15 S/cm at 1000 ∘ C.