Mossbauer Investigation of Magnetic Polymer Nanocomposites Based on Magnetite and Polyvinyl Alcohol

Raman spectra of Ni1‐XZnXFe2O4 nanopowders

“…In Mössbauer investigations of these ferrites, very weak magnetic component corresponding to the weakly magnetic phase was detected, parameters that could not be determined due to low intensity of the corresponding maxima, and it is impossible to separate them from the intense maxima of Fe cations of A and B sublattices. The diffuse reflectance spectra of different compositions Ni 1‐x Zn x Fe 2 O 4 nanopowders with a grain size of ~20 nm were observed maxima, and the positions of which depended on the relations Fe 2+ /Fe 3+ and Ni 2+ /Ni +3 cations.…”

“…It is well known that Mössbauer spectra of Fe 3 O 4 at 300K are concerned with the set of Zeeman sextets with the parameters of hyperfine interactions, conforming to Fe 3+ and Fe 2.5+ cations. Significant increase of Fe 3+ component Fe 2.5+ /Fe 2+ indicates the oxidation of Fe 3 O 4 part (~45%) to γ‐Fe 2 O 3 .…”

Composite “Crosslinked Polyvinyl Alcohol-Magnetite” as a Stimuli-Responsive Matrix for Optical Methods

“…Mixing ammonia vapors with a fan makes it possible to distribute them evenly throughout the entire volume of the desiccator. The advantage of this deposition method is the narrower size distribution of the resulting particles due to the uniform filling of the reactor with the ammonia vapors [ 30 ]. When magnetite is deposited in a suspension of the PVA granules in an aqueous solution of iron salts, part of the magnetite is deposited on the surface of the granules, distorting their spherical shape and making it difficult to measure their size optically.…”