Preparation and magnetic properties of Sm–Co doped strontium ferrite

Abstract:

In this work, Sm–Co doped strontium ferrite, SrFe_12-xSm_xCo_xO₁₉ (x = 0·1–0·5) composites were prepared by adding Sm³⁺ and Co²⁺ cations into M-type strontium ferrite using one-step chemical coprecipitation method. The composites were characterized by FTIR and XRD. The magnetic properties of the samples were measured and analyzed by VSM. The results indicated that the average crystallite sizes located in a range of 29·7–32·9 nm. Lattice constants, a and c were close to 5·88 and 23·05 Å for the M-type strontium ferrite phase. The analyses of magnetic properties demonstrated that when x = 0·2 and 0·4, Sm³⁺ and Co²⁺ ions substituted Fe³⁺ ions at 12 k (↑) or 2a (↑) site. While, as x = 0·1, 0·3, and 0·5, Fe³⁺ ions at 12 k (↑) or 2a (↑) site were replaced by Sm³⁺ ions and Fe³⁺ ions at 4f₂ (↓) site were substituted by Co²⁺ ions. Meanwhile, the proposed substitute mechanism in this work was expected to provide a good concept to modify directionally M-type strontium ferrite in order to extend its application field.

Keywords:

• Nanomaterial
• strontium ferrite
• substitute mechanism
• magnetic property
• coprecipitation method

Acknowledgements

We want to thank the financial support from Youth research talents′ growth support program of Yangtze Normal University and Chongqing Basic Science and Advanced Technology Research Program (CSTC2015jcyjBX0015). We gratefully acknowledge many important contributions from the researchers of all reports cited in our paper.