Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 272, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2021.115345
Keywords
Titanium doped barium hexaferrites; Crystal structure; Rietveld fitting; Magnetic crystal anisotropy coefficient; Permittivity; Tangent loss
Funding
- RFBR [20-08-00716]
- Russian Federation [MD-5612.2021.4]
- Ministry of Education and Science of the Russian Federation [K3-2016-019]
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This study investigates the crystal structure, magnetic, and dielectric properties of titanium-barium hexaferrites. It was found that Ti4+ cations substitute Fe3+ cations, leading to changes in unit cell parameters with varying x values. The real part of permittivity increases with temperature while decreasing with frequency.
The BaFe12-xTixO19 hexaferrites up to x = 3.00 were extended. XRD patterns were Rietveld fitted for P6(3)/mmc (no. 194) space group and the unit cell parameters were defined. The a parameter and V volume of unit cell change non-monotonically with x while the c parameter has linear behavior. The Ti4+ cations substitute the Fe3+ cations in the 2a, 4fVI and 12 k octahedral positions. This is confirmed by the Mossbauer spectroscopy. M-s spontaneous magnetization was determined with the law of approach to saturation from field magnetization at 5 K and 300 K. The epsilon(/) real part of the permittivity increases constantly with increasing temperature and decreases with frequency. The main objective of this study is an interpretation of the magnetic and dielectric properties of the titanium-barium hexaferrites which has performed in frame of breakdown of Fe3+ -O2- -Fe3+/2+(Ti4+) indirect superexchange interactions taking into account the positions occupation.
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