Magnetic and dipole moments in indium doped barium hexaferrites

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:457

Article

Trukhanov, S. V.^1,2,3  Trukhanov, A. V.^1,2,3  Turchenko, V. A.^4,5  Trukhanov, An. V.^1,3  Tishkevich, D. I.³  Trukhanova, E. L.^1,3  Zubar, T. I.⁶  Karpinsky, D. V.³  Kostishyn, V. G.¹  Panina, L. V.¹  Vinnik, D. A.²  Gudkova, S. A.^2,7  Trofimov, E. A.²  Thakur, P.⁸  Thakur, A.⁹  Yang, Y.¹⁰ 

[1] Natl Univ Sci & Technol MISiS, Leninsky Prospekt 4, Moscow 119049, Russia

[2] South Ural State Univ, Lenin Prospect 76, Chelyabinsk 454080, Russia

[3] NAS Belarus, SSPA Sci & Pract Mat Res Ctr, P Brovki Str 19, Minsk 220072, BELARUS

[4] Joint Inst Nucl Res, Joliot Curie Str 6, Dubna 141980, Russia

[5] NAS Ukraine, Donetsk Inst Phys & Technol, Prospect Nauky 46, UA-03680 Kiev, Ukraine

[6] NAS Belarus, AV Luikov Heat & Mass Transfer Inst, P Brovki Str 15, Minsk 220072, BELARUS

[7] Moscow Inst Phys & Technol, Inst Skiy Per 9, Dolgoprudnyi 141700, Russia

[8] Amity Univ Gurgaon, Amity Sch Appl Sci, Gurgaon 122413, Haryana, India

[9] Amity Univ Gurgaon, Amity Ctr Nanotechnol, Gurgaon 122413, Haryana, India

[10] Yibin Univ, Sch Phys & Elect Engn, Computat Phys Key Lab Sichuan Prov, Yibin 644007, Peoples R China

关键词: Substituted hexaferrites;    Neutron powder diffraction;    Crystal and magnetic structure;    Magnetic moment;    Spontaneous polarization;   

DOI  :  10.1016/j.jmmm.2018.02.078

来源: Elsevier

【 摘 要 】

Crystal and magnetic structure of the doped BaFe12-xInxO19 samples were refined by the results of investigations using high resolution neutron powder diffraction and vibration sample magnetometry at different temperatures. The refinements were realized in frame of two space groups. The P6(3)/mmc (No 194) centrosymmetric nonpolar and P6(3)mc (No 186) noncentrosymmetric polar space groups were used. The unit cell parameters, ionic coordinates, thermal isotropic factors, occupation positions, bond lengths and bond angles, microstrain values were established. The magnetic and dipole moments were also defined. It is established that the In3+ cations may be located only in the Fe1 -2a and Fe2 - 2b crystallographic positions with equal probability for the sample with lowest substitution level x = 0.1. At the x = 1.2 substitution level about half of the In3+ cations occupies the Fe5 -12 k positions. For the last sample the remaining half of the In-3+ cations is equiprobably located in the Fe1 - 2a and Fe2 - 2b positions. The spontaneous polarization was established for these compositions at 300 K. It is studied the influence of the type of substitutive cation and structural parameters on the Fe3+(i) - O-2 -Fe3+(j) (i, j = 1, 2, 3, 4, 5) indirect superexchange interactions with temperature. With substitution level increase the superexchange interactions between the magnetic positions inside and outside the sublattices are broken which leads to a decrease in the value of their magnetic moments. (C) 2018 Elsevier B.V. All rights reserved.

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