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Navrotsky, Alexandra; Ma, Chengcheng; Lilova, Kristina; Birkner, Nancy
Science (American Association for the Advancement of Science), 10/2010, Letnik: 330, Številka: 6001Journal Article
Knowing the thermodynamic stability of transition metal oxide nanoparticles is important for understanding and controlling their role in a variety of industrial and environmental systems. Using calorimetric data on surface energies for cobalt, iron, manganese, and nickel oxide systems, we show that surface energy strongly influences their redox equilibria and phase stability. Spinels (M₃O₄) commonly have lower surface energies than metals (M), rocksalt oxides (MO), and trivalent oxides (M₂O₃) of the same metal; thus, the contraction of the stability field of the divalent oxide and expansion of the spinel field appear to be general phenomena. Using tabulated thermodynamic data for bulk phases to calculate redox phase equilibria at the nanoscale can lead to errors of several orders of magnitude in oxygen fugacity and of 100 to 200 kelvin in temperature.
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