Factors controlling phase formation of novel Sr-based Y-type hexagonal ferrite nanoparticles
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- 作者：R THOLKAPPIYAN ; K VISHISTA ; FATHALLA HAMED
- 关键词：Hexagonal ferrites ; combustion process ; X ; ray photoelectron spectroscopy ; glycine ; oxidation state
- 刊名：Pramana
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：88
- 期：2
- 全文大小：
- 刊物类别：Physics and Astronomy
- 刊物主题：Physics, general; Astronomy, Observations and Techniques; Astrophysics and Astroparticles;
- 出版者：Springer India
- ISSN：0973-7111
- 卷排序：88
文摘
New Sr-based Y-type nanocrystalline hexagonal ferrites with a nominal chemical composition of Sr 2Mg 2Fe 12O22 (Sr 2Y) were prepared by autocombustion from mixtures of Sr(NO 3) 2, Mg(NO 3) 2⋅6H 2O and Fe(NO 3) 3⋅9H 2O. The newly prepared Sr 2Y nanocrystalline particles were characterized by powder X-ray diffraction (XRD). A well crystalline phase of Sr 2Y with hexagonal crystal structure was observed. Fourier transform infrared spectroscopy (FTIR) studies revealed the information about the positions of the ions and their bonds within the lattice structure of the Sr 2Y. The chemical elements and their oxidation states in the Sr 2Y hexaferrites were determined using X-ray photoelectron spectroscopy (XPS). The XRD, FTIR and XPS studies confirmed the formation of Sr 2Mg 2Fe 12O22 hexaferrites. The morphology and porosity of the prepared Sr 2Y nanocrystalline Sr 2Y hexaferrite particles were studied by field emission scanning electron microscopy. The magnetic properties of Sr 2Y hexaferrites showed dependence on the methods of preparation conditions and calcination treatments. The values of coercivity, saturation magnetization and retentivity were in the range of 21.33–19.66 kA m −1, 42.44– 38.72 emu g −1 and 10.05–13.19 emu g −1 respectively.