p(O{sub 2})-stability of LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}solid solutions at 1100 {sup o}C

Journal Article · Wed Sep 15 00:00:00 EDT 2010 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2010.06.013· OSTI ID:21432467

Cherepanov, V A ^[1]

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1. Department of Chemistry, Ural State University, Lenin Ave. 51, 620083 Ekaterinburg (Russian Federation)

LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}(x=0.1-1.0) perovskites were synthesized via citrate route. The p(O{sub 2})-stability of the perovskite phases LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}has been evaluated at 1100 {sup o}C based on the results of XRD analysis of powder samples annealed at various p(O{sub 2}) and quenched to room temperature. The isothermal LaFeO{sub 3-{delta}-}'LaNiO{sub 3-{delta}'} cross-section of the phase diagram of the La-Fe-Ni-O system has been proposed in the range of oxygen partial pressure -15<log p(O{sub 2})/atm{<=}0.68. The unit cell parameters of orthorhombic perovskites O-LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}increase with decrease in p(O{sub 2}) at fixed composition x. This behavior is explained on the basis of size factor. The decomposition temperatures of rhombohedral phases R-LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}for x=0.7, 0.8, 0.9 and 1.0 in air were determined as 1137, 1086, 1060 and 995 {sup o}C, respectively. - Graphical abstract: Isothermal LaFeO{sub 3-{delta}-}'LaNiO{sub 3-{delta}'} section of the phase diagram of the La-Fe-Ni-O system at 1100 {sup o}C. The hatched areas represent single phase regions: O-LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}(x{<=}0.4) with orthorhombically distorted perovskite structure and R-LaFe{sub 1-x}Ni{sub x}O{sub 3-{delta}}(0.6{<=}x<0.8) with rhombohedral one.

• OSTI ID: 21432467
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 9 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
CARBOXYLIC ACID SALTS
CHALCOGENIDES
CHEMICAL REACTIONS
CITRATES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
DIAGRAMS
DIFFRACTION
DISPERSIONS
HEAT TREATMENTS
HOMOGENEOUS MIXTURES
INFORMATION
IRON COMPOUNDS
LANTHANUM COMPOUNDS
MINERALS
MIXTURES
NICKEL COMPOUNDS
ORTHORHOMBIC LATTICES
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTIAL PRESSURE
PEROVSKITE
PEROVSKITES
PHASE DIAGRAMS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SOLID SOLUTIONS
SOLUTIONS
STABILITY
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRIGONAL LATTICES
X-RAY DIFFRACTION