%0 Journal Article %1 WOS:000614114500146 %A Vinnik, D A %A Zhivulin, V E %A Uchaev, D A %A Gudkova, S A %A Zhivulin, D E %A Starikov, Yu A %A V, S Trukhanov %A Turchenko, V A %A I, T Zubar %A Gavrilova, T P %A Eremina, R M %A Fadeev, E %A Lahderanta, E %A Sombra, A S B %A Zhou, D %A Jotania, R B %A Singh, Charanjeet %A V, A Trukhanov %C PO BOX 564, 1001 LAUSANNE, SWITZERLAND %D 2021 %I ELSEVIER SCIENCE SA %J JOURNAL OF ALLOYS AND COMPOUNDS %K Crystal Magnetization; Spin Titanium doping; glass} hexaferrite; structure; {Barium %R 10.1016/j.jallcom.2020.158365 %T Effect of titanium substitution and temperature variation on structure and magnetic state of barium hexaferrites %V 859 %X 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 P6(3)/mmc space group (No. 194). With increasing temperature and doping concentration, the unit cell parameters increase almost monotonically. The minimum volume of V similar to 696.72 angstrom(3) was determined for the composition with x = 1.00 at T = 100 K, while the maximum value of V similar to 714.00 angstrom(3) 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 T-dif temperature of the difference between the ZFC-FC curves decreases with an increase in the concentration of titanium cations and the magnetic field from similar to 237.2 K to similar to 44.5 K, while the T-inf inflection temperature of the ZFC curve increases from similar to 21.0 K to similar to 23.8 K. With an increase in the doping concentration, both the D-av average and D-max maximum clusters grow up to similar 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 T-C Curie temperature down to T similar to 600 K. The M-s spontaneous and M-r remanent magnetizations, as well as the B-c 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 M-s similar to 17.7 emu/g, M-r similar to 1.9 emu/g, and B-c similar to 3.9 x 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. (C) 2020 Elsevier B.V. All rights reserved.

@article{WOS:000614114500146, abstract = {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 P6(3)/mmc space group (No. 194). With increasing temperature and doping concentration, the unit cell parameters increase almost monotonically. The minimum volume of V similar to 696.72 angstrom(3) was determined for the composition with x = 1.00 at T = 100 K, while the maximum value of V similar to 714.00 angstrom(3) 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 T-dif temperature of the difference between the ZFC-FC curves decreases with an increase in the concentration of titanium cations and the magnetic field from similar to 237.2 K to similar to 44.5 K, while the T-inf inflection temperature of the ZFC curve increases from similar to 21.0 K to similar to 23.8 K. With an increase in the doping concentration, both the D-av average and D-max maximum clusters grow up to similar 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 T-C Curie temperature down to T similar to 600 K. The M-s spontaneous and M-r remanent magnetizations, as well as the B-c 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 M-s similar to 17.7 emu/g, M-r similar to 1.9 emu/g, and B-c similar to 3.9 x 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. (C) 2020 Elsevier B.V. All rights reserved.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, author = {Vinnik, D A and Zhivulin, V E and Uchaev, D A and Gudkova, S A and Zhivulin, D E and Starikov, Yu A and V, S Trukhanov and Turchenko, V A and I, T Zubar and Gavrilova, T P and Eremina, R M and Fadeev, E and Lahderanta, E and Sombra, A S B and Zhou, D and Jotania, R B and Singh, Charanjeet and V, A Trukhanov}, biburl = {https://www.bibsonomy.org/bibtex/2101fc6cf29b006d68d66fcc06ab1c32a/ppgfis_ufc_br}, doi = {10.1016/j.jallcom.2020.158365}, interhash = {f9159d0a849b4de9f9e50a14ef656ea3}, intrahash = {101fc6cf29b006d68d66fcc06ab1c32a}, issn = {0925-8388}, journal = {JOURNAL OF ALLOYS AND COMPOUNDS}, keywords = {Crystal Magnetization; Spin Titanium doping; glass} hexaferrite; structure; {Barium}, publisher = {ELSEVIER SCIENCE SA}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Effect of titanium substitution and temperature variation on structure and magnetic state of barium hexaferrites}, tppubtype = {article}, volume = 859, year = 2021 }