Structural and magnetic properties of nickel antimony ferrospinels

Ivanov, S.A.; Tellgren, R.; Porcher, F.; André, G.; Ericsson, T.; Nordblad, P.; Sadovskaya, N.; Kaleva, G.; Politova, E.; Baldini, M.; Sun, C.; Arvanitis, D.; Anil, K.P.; Mathieu, R.

Авторы: Ivanov S.A., Tellgren R., Porcher F., André G., Ericsson T., Nordblad P., Sadovskaya N., Kaleva G., Politova E., Baldini M., Sun C., Arvanitis D., Anil Kumar P., Mathieu R.
Журнал: Materials Chemistry and Physics
Том: 158
Год издания: 2015
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Первая страница: 127
Последняя страница: 137
DOI: 10.1016/j.matchemphys.2015.03.051
Аннотация: Spinel-type compounds of FeeNieSbeO system were synthesized as polycrystalline powders. The crystal and magnetic properties were investigated using X-ray and neutron powder diffraction, M€ossbauer and X-ray absorption spectroscopy and magnetization measurements. The samples crystallize in the cubic system, space group Fd e 3 m. The distribution of cations between octahedral and tetrahedral sites was refined from the diffraction data sets using constraints imposed by the magnetic, M€ossbauer and EDS results and the ionic radii. The cation distribution and the temperature dependence of the lattice parameter (a) and the oxygen positional parameter (u) were obtained. A chemical formula close to Fe0.8Ni1.8Sb0.4O4 was determined, with Sb5þ cations occupying octahedral sites, and Fe3þ and Ni2þ occupying both tetrahedral and octahedral sites. Fe3þ mainly (85/15 ratio) occupy tetrahedral sites, and conversely Ni2þ mainly reside on octahedral ones. The magnetic unit cell is the same as the crystallographic one, having identical symmetry relations. The results indicate that the compounds have a collinear ferrimagnetic structure with antiferromagnetic coupling between the tetrahedral (A) and octahedral (B) sites. Uniquely, the temperature dependence of the net magnetization of this rare earth free ferrimagnet exhibits a compensation point.
Добавил в систему: Иванов Сергей Александрович

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Structural and magnetic properties of nickel antimony ferrospinelsстатья Исследовательская статья

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