Mossbauer and Raman spectroscopy study of Y-garnet particles’ magnetic properties tune-up through mechanochemically synthesized precursors

• Published in: Hyperfine interactions 2021-12, Vol.242 (1), Article 57
• Main Authors: Tatiana, Kiseleva, Tatiana, Grigoreva, Pavel, Tyapkin, Il’ya, Ivanenko, Evgeniya, Devyatkina, Gennadiy, Markov, Deleg, Sangaa, Alexander, Ilyushin, Nikolay, Lyakhov
• Format: Article
• Language: English
• Subjects: 5-10 September 2021; Atomic; Brasov; Condensed Matter Physics; Crystal defects; Fine structure; Grain boundaries; Hadrons; Heavy Ions; Iron oxides; Magnetic properties; Magnetic structure; Molecular; Mossbauer spectroscopy; Nuclear Physics; Optical and Plasma Physics; Physics; Physics and Astronomy; Precursors; Proceedings of the International Conference on the Applications of the Mössbauer Effect (ICAME 2021); Raman spectroscopy; Romania; Spectrum analysis; Surfaces and Interfaces; Synthesis; Thin Films; Yttrium oxide
• ISSN: 0304-3843; 1572-9540
• DOI: 10.1007/s10751-021-01770-2

We apply high energy mechanosynthesis in mixtures of Y 2 O 3 and Fe 2 O 3 to form activated nanostructured oxide composites for subsequent temperature treatment with the aim to synthesize single phase functional Y 3 Fe 5 O 12 garnet particles. Obtained at the same temperature regime but starting from structurally different precursors, garnet particles demonstrate different magnetic behavior. Mossbauer and Raman spectroscopy were applied for a comprehensive characterization on the local atomic scale the influence of the mechanochemically produced precursor’s fine structure formed at different activation duration on the structural and magnetic state of the garnet particles. X-ray diffraction and visualization of fine particles structure by SEM microscopy were supplemented. An intermediate disordered iron oxide phases and orthoferrite YFeO 3 rather garnet structure formation at prolonged duration of intense mechanical activation was determined. Magnetic structure of Y 3 Fe 5 O 12 formed after annealing was dependent on the degree of the oxides interaction in precursors and defects concentrated at the grain boundaries and interfaces. Both applied spectroscopies showed complementary insight into the nature of the local structural disorder at the steps of mechanosynthesis to the mechanism of fine garnet structure formation.