MGssbauer experiments using the 86.5 keV resonance of 1 5 5 ~ d have been performed on Gdl+,Fe4B4 with and without substitution of 20 % of Gd by Nd or Sm. All these alloys are characterized by a very large quadrupolar interaction. At T = 4.2 K, i.e. below the magnetic temperature order, the Miissbauer spectra are quite different for the three alloys, owing to the different direction of the Gd m...

The design of nanoporous perovskite oxides is considered an efficient strategy to develop performing, sustainable catalysts for the conversion methane. dependency nanoporosity on oxygen defect chemistry and catalytic activity toward CH4 CO oxidation was studied here. A novel colloidal synthesis route nanoporous, high-temperature stable SrTi0.65Fe0.35O3-δ with specific surface areas (SSA) rangin...

The atomic structure of soft magnetic iron-aluminum alloys is studied by X-ray diffraction and nuclear gamma-resonance spectroscopy. concentration dependence the body-centered cubic lattice constant short-range order (SRO) parameters in region a disordered solid solution monitored. It shown that range from 3 to 18 at.% Al, increases almost linearly. Discrete decomposition gamma resonance spectr...

Mossbauer spectra of MnFez04 with various particle sizes in a longitudinal 50 kOe magnetic field show that the Fe ion occupancy of the A and B crystallographic sites depends on the particle size. The elevated N6el temperatures with decreasing particle sizes are attributed to an increased iron occupancy on the A sites; this in turn leads to an increase in the total superexchange interaction.

The structural transformation of substituted hexagonal ferrite powders BaFetoCoTiO~s prepared by mechanical milling, was investigated as a fimction of grinding time by means of MOssbauer spectrometry and static magnetic measurements. A spin reorientation is clearly evidenced from the temperature dependence of the hyperfine parameters and of the initial magnetic permeability on the powder mechan...

The results of studies the properties co-deposition magnetic nanoparticles (MNPs) Co 1-x Zn x Fe 2 O 4 spinel ferrites synthesized (at x=0.0; 0.1; 0.2; 0.4; 0.6) in order to synthesize particles for biomedical applications. X-ray diffraction (XRD), raman spectra, measurements and Mossbauer spectroscopy (MS) were used study MNPs. It was found that MNPs are single-phase. According XRD measurement...

The results of studies the features phase composition, crystal and magnetic structure Bi-substituted barium hexaferrite BaFe12-xBixO19 (0.1≤ x≤ 1.2) by methods Mossbauer spectroscopy, X-ray analysis, as well image analysis scanning electron microscopy are presented. Samples hexaferrites - (where x=0.1; 0.3; 0.6; 0.9 were synthesized method solid-phase reactions with double annealing (at T=1100o...