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Effect of titanium substitution and temperature variation on structure and magnetic state of barium hexaferrites

Vinnik, D.A.; Zhivulin, V.E.; Uchaev, D.A.; Gudkova, S.A.; Zhivulin, D.E.; Starikov, A.Yu; Trukhanov, S.V.; Turchenko, V.A.; Zubar, T.I.; Gavrilov, T.P.; Eremin, R.M.; Fadeev, E.; Lähderanta, E.; Sombra, A.S.B.; Zhou, D.; Jotania, R.B.; Singh, Charanjeet; Trukhanov, A.V. (2020-12-17)

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vinnik_et_al_effect_of_titanium_substitution_aam.pdf (1.076Mb)
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Post-print / Final draft

Vinnik, D.A.
Zhivulin, V.E.
Uchaev, D.A.
Gudkova, S.A.
Zhivulin, D.E.
Starikov, A.Yu
Trukhanov, S.V.
Turchenko, V.A.
Zubar, T.I.
Gavrilov, T.P.
Eremin, R.M.
Fadeev, E.
Lähderanta, E.
Sombra, A.S.B.
Zhou, D.
Jotania, R.B.
Singh, Charanjeet
Trukhanov, A.V.
17.12.2020

Journal of Alloys and Compounds

859

Elsevier

School of Engineering Science

https://doi.org/10.1016/j.jallcom.2020.158365
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Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi-fe202101222394

Tiivistelmä

A number of solid solutions based on BaFe12−xTixO19 M-type barium hexaferrite doped with titanium cations up to x = 2.00 were obtained using conventional ceramic technology. The phase composition, crystal structure and unit cell parameters were refined by the Rietveld method using powder X-ray diffraction data up to T = 900 K. It was found that all the compositions have a magnetoplumbite structure satisfactorily described by P63/mmc space group (No. 194). With increasing temperature and doping concentration, the unit cell parameters increase almost monotonically. The minimum volume of V ~ 696.72 Å3 was determined for the composition with x = 1.00 at T = 100 K, while the maximum value of V ~ 714.00 Å3 is observed for the composition with x = 2.00 at T = 900 K. The mechanism of occupation nonequivalent crystallographic positions with titanium cations is established. The spin-glass component of the magnetic phase state is fixed. The Tdif temperature of the difference between the ZFC-FC curves decreases with an increase in the concentration of titanium cations and the magnetic field from ~237.2 K to ~ 44.5 K, while the Tinf inflection temperature of the ZFC curve increases from ~21.0 K to ~23.8 K. With an increase in the doping concentration, both the Dav average and Dmax maximum clusters grow up to ~ 100 nm. As the magnetic field increases above the critical value, the spin-glass component disappears. For compositions with x > 1.00, the magnetization is not saturated in fields up to 6 T. Along with the formation of the spin-glass component, doping with titanium cations for barium hexaferrite lowers the TC Curie temperature down to T ~600 K. The Ms spontaneous and Mr remanent magnetizations, as well as the Bc coercivity, decrease with increasing doping concentration almost monotonically, while the latter has an inflection point at x = 1.00. The minimum values of spontaneous and remanent magnetization, as well as coercivity, are observed for the composition with x = 2.00 and amount to Ms ~17.7 emu/g, Mr ~1.9 emu/g, and Bc ~3.9 × 10−3 T, respectively. An interpretation of the magnetic state of the doped BaFe12−xTixO19 barium hexaferrite is given taking into account the mechanism of occupation nonequivalent crystallographic positions with titanium cations.

Lähdeviite

Vinnik, D.A., Zhivulin, V.E., Uchaev, D.A., Gudkova, S.A., Zhivulin, D.E., Starikov, A.Yu, Trukhanov, S.V., Turchenko, V.A., Zubar, T.I., Gavrilov, T.P., Eremin, R.M., Fadeev, E., Lähderanta, E., Sombra, A.S.B., Zhou, D., Jotania, R.B., Singh, Charanjeet, Trukhanov, A.V. (2020). Effect of titanium substitution and temperature variation on structure and magnetic state of barium hexaferrites. Journal of Alloys and Compounds, vol. 859. DOI: 10.1016/j.jallcom.2020.158365

Alkuperäinen verkko-osoite

https://www.sciencedirect.com/science/article/abs/pii/S0925838820347289?via%3Dihub
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