4.6 Article

p(O2)-stability of LaFe1-xNixO3-δ solid solutions at 1100 °C

Journal

JOURNAL OF SOLID STATE CHEMISTRY
Volume 183, Issue 9, Pages 1992-1997

Publisher

ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2010.06.013

Keywords

Perovskite; LaFe1-xNixO3-delta; Thermodynamic stability; Phase diagram

Funding

  1. Russian Foundation for Basic Research [09-03-00620]
  2. Ministry of Education and Science of the Russian Federation

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LaFe1-xNixO3-delta (X=0.1-1.0) perovskites were synthesized via citrate route. The p(O-2)-stability of the perovskite phases LaFe1-xNixO3-delta has been evaluated at 1100 degrees C based on the results of XRD analysis of powder samples annealed at various p(O-2) and quenched to room temperature. The isothermal LaFeO3-delta-LaNiO3-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-2)/atm <= 0.68. The unit cell parameters of orthorhombic perovskites O-LaFe1-xNixO3-delta increase with decrease in p(O-2) at fixed composition x. This behavior is explained on the basis of size factor. The decomposition temperatures of rhombohedral phases R-LaFe1-xNixO3-delta for x=0.7, 0.8, 0.9 and 1.0 in air were determined as 1137, 1086, 1060 and 995 degrees C, respectively. (C) 201 0 Elsevier Inc. All rights reserved.

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