Abstract

O 2-release from carbon-bearing Ni(II) ferrite (CBNF) was studied with TG-MS and DSC. Release of lattice oxygen as O 2 was found to take place at 200–300°C and was associated with an endothermic temperature peak. The proposed thermochemical reaction is O lat.(s) = V o ̈ (s) + ( 1 2 ) O 2 (g), ΔH° = 424.5 kJ/mol , where O lat. (s) and V o ̈ (s) denote the lattice oxygen of CBNF and the oxygen-deficient site on the surface of the CBNF. At a temperature higher than 350°C, lattice oxygen was released as CO 2 and was accompanied by a decrease of deposited carbon.

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