Microstructural features of the La{sub 1−x}Ca{sub x}FeO{sub 3−δ} solid solutions prepared via Pechini route

• Published in: Materials research bulletin Vol. 70
• Main Authors: Gerasimov, E.Yu, Novosibirsk State University, Pirogova Str. 2, Novosibirsk 630090, Isupova, L.A., Tsybulya, S.V.
• Format: Journal Article
• Language: English
• Published: United States 15.10.2015
• Subjects: CALCIUM COMPOUNDS; CRYSTAL DEFECTS; CRYSTALLOGRAPHY; CRYSTALS; FERRITES; IRON OXIDES; LANTHANUM COMPOUNDS; MATERIALS SCIENCE; NANOPARTICLES; OXIDATION; PEROVSKITE; SOLID SOLUTIONS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/J.MATERRESBULL.2015.04.041

Highlights: • La{sub 1−x}Ca{sub x}FeO {sub (3−δ)} (0 ≤ x ≤ 0.7) perovskite were prepared by Pechini method. • Planar defects in direction (1 0 1) were observed in the perovskite surface. • α-Fe{sub 2}O{sub 3} particles (1–10 nm) on the surface of perovskite were revealed. • Amount of α-Fe{sub 2}O{sub 3} particles on the perovskite surface grew with rising x values. - Abstract: Solid solutions with La{sub 1−x}Ca{sub x}FeO{sub 3−δ} (0 ≤ x ≤ 0.7) perovskite-like structure prepared via Pechini route have been investigated by using high resolution transmission electron microscopy and X-ray diffraction. Extended planar defects lying in (1 0 1) crystallographic planes and α-Fe{sub 2}O{sub 3} nanoparticles on the surface of perovskite microcrystals are characteristic of the samples under investigation. It was found that testing of the samples in catalytic deep CH{sub 4} oxidation process results in partial destruction of solid solutions with formation of planar defects in the bulk and α-Fe{sub 2}O{sub 3} particles on the surface.