Preparation and physical properties of M-type hexaferrite SrCo2Ti2Fe8O19

M. Zentková*, M. Mihalik, M. Mihalik, V. Sirenko, V. V. Eremenko, A. M. Balbashov, L. Kvetková, V. Koval, A. Výrostková, J. Briančin, X. Wang, K. Kamenev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

ABSTRACT: Measurements of Raman spectra, dielectric constant and magnetization were performed on M-type hexaferrite SrCo2Ti2Fe8O19 single crystal, which was grown by travelling solvent method in an optical furnace. The Raman spectra measurements at room temperature revealed that main Raman modes, which are associated with the bipyramid FeO5, octahedra Fe(4)O6 and Fe(5)O6 as well with mixed octahedral vibration all with A1 g symmetry, shift monotonously to higher wave numbers. In the low-frequency region (<10 kHz), permittivity rapidly decreases with increasing frequency, exhibiting a typical characteristic of Maxwell-Wagner type relaxation. The relaxation peak in dielectric losses centred on 100 kHz can be attributed to ionic relaxation processes caused by multiple valence states of iron ion (Fe2+ and Fe3+). M-type hexaferrite SrCo2Ti2Fe8O19 orders magnetically at 768 K and undergoes order-to-order magnetic phase transition at 380 K. Magnetic properties are almost isotropic around room temperatures with very low hysteresis having coercive field with induction lower than 3×10−3 T and with remnant magnetization lower than 0.17 μB/f.u. for magnetic fields applied along main crystallographic directions.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalFerroelectrics
Volume499
Issue number1
DOIs
Publication statusPublished - 14 Jul 2016

Keywords / Materials (for Non-textual outputs)

  • M type hexaferrite; Raman spectroscopy; magnetic properties; single crystal

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