Abstract
Oxygen deficiency is a common phenomenon in the sintering process of nickel ferrite spinel, and has a significant impact on the properties of the NiFe 2 O 4 sintered body. This work investigated the effects of oxygen deficiency on the evolution of the lattice defects in spinel crystal. The oxygen deficiency led to the generation of a non-stoichiometric nickel ferrite containing oxygen vacancies (NiFe 2 O 4- δ ). As the sintering temperature increased from 1150 °C to 1400 °C, the concentration of oxygen vacancies in NiFe 2 O 4-δ increased, with a δ value increasing from 0.0014 to 0.0355 and a lattice parameter increasing from 8.3485 to 8.3567 Å. X-ray photoelectron (XPS), Fourier transform infrared (FTIR) and Raman spectroscopy all showed that the crystal structure of NiFe 2 O 4- δ belonged to the Fd3m space group with Fe 2+ ions partially replacing Fe 3+ in the octahedral sites. Furthermore, a tendency for NiFe 2 O 4- δ to decompose to Ni alloy and Fe 3 O 4 during sintering could be observed. • Validation of the oxygen deficiency phenomenon during sintering. • Investigation of the effects of oxygen deficiency on microstructure. • Verification of the evolution mechanism of lattice defects.
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