Single crystal growth, structural characteristics and magnetic properties of chromium substituted M -type ferrites

L. Shlyk, D. A. Vinnik, D. A. Zherebtsov, Z. Hu, C. Y. Kuo, C. F. Chang, H. J. Lin, L. Y. Yang, A. S. Semisalova, N. S. Perov, T. Langer, R. Pöttgen, S. Nemrava, R. Niewa*

*Corresponding author for this work

研究成果: Article同行評審

19 引文 斯高帕斯(Scopus)

摘要

Two different types of fluxes, namely sodium based and chloride based fluxes were used to grow Cr substituted barium and strontium hexaferrite ferrite crystals, (Sr,Ba)Fe12 -xCrxO19 at comparatively low temperatures of about 1300 °C. The sodium based flux led to growth of larger crystals up to 5 mm, but with only minor Cr contents x ≤ 0.07. From the chloride based flux the obtained Cr contents are significantly higher with x = 5.7 (Sr) and x = 3.4 (Ba), however, crystals reach only sizes in the sub-mm range. X-ray absorption spectroscopy data support exclusively isovalent substitution of Fe3+ by Cr3+ even for very low Cr contents. 57Fe Mößbauer spectroscopy reveals Cr to preferentially occupy the six-fold by oxygen coordinated site at 12k and, to a lower degree, 2a and 4f2 in space group P63/mmc. All characteristic magnetic properties drop upon Cr substitution, e. g., the Curie temperature from 728 K for pure BaFe12O19 to 465 K for BaFe8.6Cr3.4O19, the saturation magnetization from 71 emu/g to 29.7 emu/g and the coercive field from 363 Oe to 45 Oe.

原文English
頁(從 - 到)23-31
頁數9
期刊Solid State Sciences
50
DOIs
出版狀態Published - 1 十二月 2015

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