Magnetic and Mössbauer study of ε-Fe y N (2 < y < 3) nanoparticles
Source abstract
Abstract
ε-Fe y N (2 < y < 3) nanoparticles were prepared by the nitridation of spindle type hematite nanoparticles using ammonia at a temperature of 550 °C. Chemical analysis for the elements brings out the composition as y = 2.56. These nanoparticles show ferromagnetic behaviour even though it has higher nitrogen content than the stoichiometric Fe3N. The quenching of the particles from higher temperature and the higher nitrogen content introduces disorder in the system unlike the ordered ε-Fe3N. Mössbauer spectroscopy at lower temperature clearly shows the existence of two sextets corresponds to the two types of iron environments. The presence of more than one site excludes perfect ordering. This is consistent with the peak widths which result from variations in the distributions of next nearest interstitial neighbours. Existence of two different Debye temperatures for two iron sites shows that it varies according to the number and type of neighbouring atoms.
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Research context
OpenAlex topics: Iron oxide chemistry and applications · Magnetic Properties and Synthesis of Ferrites · Magnetic properties of thin films
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