Электронный каталог

Статья

Kozlenko, D.P.
Structural, Magnetic States and Pressure-Induced Phenomena in Complex Nanosized Magnetic Oxides / D.P.Kozlenko, N.M.Belozerova, S.E.Kichanov, E.V.Lukin, O.N.Lis, A.V.Rutkauskas, B.N.Savenko, [a.o.]. – Text : electronic // Natural Science Review. – 2026. – Vol. 3, No. 7. – P. 200702. – URL: https://doi.org/10.54546/NaturalSciRev.200702. – Bibliogr.: 111.

The results of the recent investigations of the crystal and magnetic structure of complex nanosized manganese and iron oxides using neutron diffraction, X-ray diffraction and other techniques over a wide range of thermodynamic parameters (temperature and pressure) are considered. In the nanostructured manganites La&sub(1-x)Sr&sub(x)MnO&sub(3) (x = 0.28−0.47), the coexistence of the ferromagnetic (FM) and A-type antiferromagnetic (AFM) states has been evidenced, implying the production of core-shell nanoparticles with distinctive structural and magnetic properties of ordering of internal and external components. Application of high pressure significantly modifies the ratio of FM and AFM components. For the nanostructured Zn&sub(0.34)Fe&sub(2.53)O&sub(4) ferrite, a distribution of Zn and Fe atoms in the crystal structure, as well as the parameters of crystal and magnetic structures, have been estimated. The oxygen vacancies were detected and their amount was estimated. The gradual transition of the structural phase from the initial cubic spinel phase to the orthorhombic post spinel phase was observed at high pressures in this material, relevant to CoFe&sub(2)O&sub(4) ferrite. In the latter case, the phase transition is also accompanied by suppression of the ordered magnetic moments. Surprisingly, in the most cases, the properties of structural and magnetic states of the studied nanosized manganites and ferrites are notably different from those for the relevant bulk forms of these materials. The microscopic mechanisms responsible for this distinction have been discussed in detail.



ОИЯИ = ОИЯИ (JINR)2026