Investigating the preferential sites of Co2+ substitution in SrCoxFe12−xO19 using Mössbauer spectroscopy

Author:

Hou Hengjian1ORCID,Li Zheng1ORCID,Lu Zeyi1ORCID,Shen Jiyu1ORCID,Wu Zhongjin1ORCID,Yang Jiangbo1ORCID,Gao Kaiyang1ORCID,Xia Yanfang1ORCID

Affiliation:

1. College of Nuclear Science and Technology, University of South China, Hengyang 421001, P. R. China

Abstract

In this paper, a series of M-type hexagonal SrCoxFe[Formula: see text]O[Formula: see text] ([Formula: see text], 0.25, 0.5) samples have been prepared by sol–gel method. X-ray diffraction (XRD) showed that the samples produced were all p63/mmc space groups of single hexagonal crystals, and the lattice parameters a, b and c did not show the expected trend with increasing x. This was related to the valence changes and lattice distortion caused by the substitution of Co[Formula: see text] at the 2a and 4f2 sites. Room temperature Mössbauer spectra studies showed that when [Formula: see text], Fe[Formula: see text] ions were not uniformly distributed, preferring the 4f1, 4f2 and 2a sites; when [Formula: see text], Co[Formula: see text] ions preferentially displaced the 2a and 4f2 sites and the presence of Fe[Formula: see text] was detected; when [Formula: see text], Co[Formula: see text] ions preferentially displaced the 4f1 and 2b sites and the percentage of Fe[Formula: see text] occupancy was reduced, with a greater occupancy ([Formula: see text] occurring at the 12k site, indicating a preference of Fe[Formula: see text] of the doped sample for this site. This work will provide an important reference for the variation of properties induced by different ion doping substitutions of the Fe sites in the hexagonal ferrite family.

Funder

National Natural Science Foundation of China

the Central Government Guided Local Science and Technology Development Special Fund Project

the National Undergraduate Innovation and Entrepreneurship Training Program Support Projects of China, the Natural Science Foundation of Hunan Province, China

Natural Science Foundation of, Hunan Province

Research Foundation of Education Bureau of Hunan Province, Chinant

Publisher

World Scientific Pub Co Pte Ltd

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