Thermodynamic properties of complex oxides in the La-Ni-O system
- Ural State University, Lenin av 51, Ekaterinburg 620083 (Russian Federation)
Complex oxides La{sub 2}NiO{sub 4+} {sub {delta}} , La{sub 3}Ni{sub 2}O{sub 7-} {sub {delta}} , La{sub 4}Ni{sub 3}O{sub 10-} {sub {delta}} and LaNiO{sub 3-} {sub {delta}} , the members of Ruddlesden-Popper series La {sub n} {sub +1}Ni {sub n} O{sub 3} {sub n} {sub +1}, were prepared using citrate precursors. The stability range of LaNiO{sub 3-} {sub {delta}} in air as well as the oxygen nonstoichiometry of La{sub 3}Ni{sub 2}O{sub 7-} {sub {delta}} and La{sub 4}Ni{sub 3}O{sub 10-} {sub {delta}} as a function of temperature and oxygen partial pressure was determined by means of thermogravimetric technique. Decomposition temperatures of La{sub 3}Ni{sub 2}O{sub 7-} {sub {delta}} , La{sub 4}Ni{sub 3}O{sub 10-} {sub {delta}} and LaNiO{sub 3-} {sub {delta}} in air were determined by conductivity measurement method. The boundary of stability for La{sub 4}Ni{sub 3}O{sub 10-} {sub {delta}} was determined by EMF measurements of galvanic cell with oxygen conducting solid electrolyte. The isothermal (1400 K) projection of La-Ni-O system phase diagram to the plane 'log(PO{sub 2})-relative mole fraction of metal components' was suggested. - Graphical abstract: The crystal structure of La{sub 4}Ni{sub 3}O{sub 10}.
- OSTI ID:
- 20905429
- Journal Information:
- Journal of Solid State Chemistry, Vol. 179, Issue 8; Other Information: DOI: 10.1016/j.jssc.2006.05.026; PII: S0022-4596(06)00308-2; Copyright (c) 2006 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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