Influence of aluminum substitution on the fi eld of effective magnetic anisotropy and the degree of magnetic texture of anisotropic polycrystalline hexagonal ferrites of barium and strontium for substrates of microstrip devices of microwave electronics
Open Access
- 31 October 2019
- journal article
- Published by National University of Science and Technology MISiS in Materials of Electronics Engineering
- Vol. 21 (3), 166-174
- https://doi.org/10.17073/1609-3577-2018-3-166-174
Abstract
In this paper, the effect of Al3+ ions substitutions on the value of the effective magnetic anisotropy field НАeff and the degree of magnetic texture f of the anisotropic polycrystalline hexagonal barium and strontium ferrites were studied. The samples were obtained by the ceramic technology method and the texture was formed by pressing in a magnetic field. The sample preparation technology presented in detail. The batches of barium hexaferrites were synthesized with the concentration of Al3+ ions: 0.9; 1.4; 2.5 and 2.6 formula units while strontium hexaferrites had Al3+ concentration of 0.1 formula units. It has been shown that by this technology barium and strontium hexaferrites with high value of (in range of 19—35 kOe) and with f = 80—83% could be obtained. The achieved values of НАeff and f could be sufficient for the production of substrates for microstrip microwave devices in millimeter−wave region.For the first time a raise in the degree of magnetic texture of polycrystalline barium hexaferrites with an increase of concentration of Al3+ ions were detected; a slight (5.5—5.8%) magnetic texture of isotropic strontium hexaferrites was also detected. The achieved results discussed in detail. For studied hexaferrites the mechanism of magnetic texture formation during the process of synthesis is proposed.Keywords
This publication has 11 references indexed in Scilit:
- Correlation of the atomic structure, magnetic properties and microwave characteristics in substituted hexagonal ferritesJournal of Magnetism and Magnetic Materials, 2018
- Critical influence of different diamagnetic ions on electromagnetic properties of BaFe12O19Ceramics International, 2018
- Control of electromagnetic properties in substituted M-type hexagonal ferritesJournal of Alloys and Compounds, 2018
- Strong corelation between magnetic and electrical subsystems in diamagnetically substituted hexaferrites ceramicsCeramics International, 2017
- Multiferroic properties and structural features of M-type Al-substituted barium hexaferritesPhysics of the Solid State, 2017
- Thermal evolution of exchange interactions in lightly doped barium hexaferritesJournal of Magnetism and Magnetic Materials, 2017
- Evolution of structure and magnetic properties for BaFe11.9Al0.1O19 hexaferrite in a wide temperature rangeJournal of Magnetism and Magnetic Materials, 2017
- Study of the features of the magnetic and crystal structures of the BaFe12-Х ALXO19 AND BaFe12-Х GaXO19 substituted hexagonal ferritesEastern-European Journal of Enterprise Technologies, 2017
- Effects of base composition and dopants on the properties of hexagonal ferritesRussian Journal of Inorganic Chemistry, 2016
- Ferromagnetic properties of hexagonal iron-oxide compounds with and without a preferred orientationThe European Physical Journal A, 1952