Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films

The work highlights peculiar features of synthesis and summarizes important properties of nanoparticles and films based on two types of oxide magnets: with spinel and perovskite-type structures. The attention is drawn to the differences in the processes underlying the formation of crystalline phase in the materials of each group. It is shown that for the spinels, the formation of weakly agglomerated crystalline nanoparticles can occur in the process of synthesis, but for the perovskite-like magnets, the formation of crystalline nanoparticles requires additional high-temperature treatment. It is demonstrated that synthesized nanoparticles and films may find wide practical applications, particularly as the heat mediators in hyperthermia treatment therapy, as components of left-handed media, ferroelectric-ferromagnetic layered structures and composite microwave resonators. They also may be used as integral parts of composite structures, which possess magnetic-field-controlled properties and display giant magnetocaloric effect

Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films

The work highlights peculiar features of synthesis and summarizes important properties of nanoparticles and films based on two types of oxide magnets: with spinel and perovskite-type structures. The attention is drawn to the differences in the processes underlying the formation of crystalline phase in the materials of each group. It is shown that for the spinels, the formation of weakly agglomerated crystalline nanoparticles can occur in the process of synthesis, but for the perovskite-like magnets, the formation of crystalline nanoparticles requires additional high-temperature treatment. It is demonstrated that synthesized nanoparticles and films may find wide practical applications, particularly as the heat mediators in hyperthermia treatment therapy, as components of left-handed media, ferroelectric-ferromagnetic layered structures and composite microwave resonators. They also may be used as integral parts of composite structures, which possess magnetic-field-controlled properties and display giant magnetocaloric effect

Dielectric resonator in rectangular ??(102) cavity for electron paramagnetic resonance study of thin films

The improved compared to a rectangular TE(102 )cavity geometry of a dielectric resonator (DR) suitable for studying thin films and coatings has been calculated and experimentally verified. It is shown that electron paramagnetic resonance (EPR) signal of SiOx films can be enhanced by using as the DR of two rectangular parallelepipeds fabricated from BaTi4O9 + 8.5% ZnO ceramics (epsilon=36) with dimension of 5.64x5.5 x 5.9 mm(3 )and a gap of up to 0.5 mm between them. Located inside a standard rectangular metal TE(102 )cavity of the X-band EPR spectrometer, the DR increases the filling factor by 5-12 times depending on the size of a sample studied. The experimental use of the DR allows to increase the EPR signal of the 950 nm SiOx thin film by a factor of approximately 4.Funding Agencies|National Academy of Sciences of Ukraine [0118U002317, 0118U002317s]; Swedish Foundation for Strategic Research (SSF) [UKR22-0040]</p

Lithium La0.57Li0.33TiO3 Perovskite and Li1.3Al0.3Ti1.7(PO4)3 Li-NASICON supported thick films electrolytes prepared by tape casting method

In this work, thick films of Perovskite LaLiTiO (LLTO) and Li-NASICON LiAlTi(PO) (LATP) Li-conductors have been prepared by tape casting and their microstructure and homogeneity assessed by SEM and confocal Raman spectroscopy. Electrical properties of thick films have been investigated by Impedance spectroscopy. In particular, bulk, grain-boundary and electrode contributions to conductivity have been differentiated as a function of frequency. However, modifications on the grainboundary chemistry affects considerably ion conductivity of films. The confocal Raman spectroscopy results allowed the observation of the resulting phases particles connectivity in thick films and a better understanding of ionic conductivity results in relation with the samples heterogeneity. In LLTO films, the reactivity of the film particles against water leads to formation of hydroxyl groups that decreases the Li mobility at the particles surface after sintering. In LTAP films the formation of a high conducting grain-boundary phase leads to improve total conductivity values making thick films promising candidates for application in all solid state Li secondary batteries