NDLI: Influence of Structure and Oxidation State on Magnetic Properties of Sr$_{1−x }$La$_{ x }$Fe$_{12−x }$Co$_{ x }$O$_{19}$ Nanoparticles Prepared by Sol

Content Provider	Springer Nature Link
Author	Loan, To Thanh Nga, Tran Thi Viet Duong, Nguyen Phuc Soontaran, Siriwat Hien, Than Duc
Copyright Year	2017
Abstract	Nanoparticles of Sr$_{1−x }$La$_{ x }$Fe$_{12−x }$Co$_{ x }$O$_{19}$ (x = 0 to 0.2) hexagonal ferrite have been synthesized by the sol–gel method using citric acid to complex the ions, followed by an autocombustion reaction after annealing at 900°C for 2 h in air. The crystal structure, valence state, and morphology of the samples were studied by x-ray diffraction (XRD) analysis, synchrotron x-ray diffraction (SXRD), x-ray absorption near-edge spectroscopy (XANES), and scanning electron microscopy. Rietveld refinement of XRD and SXRD patterns revealed that single-phase SrFe$_{12}$O$_{19}$ was obtained for all samples; the La$^{3+}$ ion preferentially occupies the 2d site, whereas the Co$^{2+}$ ion preferentially occupies the 2a and 4f$_{2}$ sites. XANES analysis results indicated presence of Fe$^{2+}$ ion in the samples with x = 0.1, 0.15, and 0.2. The particles were single domain with size in the range from 50 nm to 80 nm. The magnetic properties of the hexaferrite samples (SrFe$_{12}$O$_{19}$) were significantly improved as a result of the appropriate La/Co substitution. The coercivity values at room temperature increased from 6.7 kOe to 8 kOe with increasing La/Co concentration from 0 to 0.2. Maximum saturation magnetization of 73 emu/g was achieved at La/Co concentration of x = 0.1.
Starting Page	3396
Ending Page	3405
Page Count	10
File Format	PDF
ISSN	03615235
Journal	Journal of Electronic Materials
Volume Number	46
Issue Number	6
e-ISSN	1543186X
Language	English
Publisher	Springer US
Publisher Date	2017-02-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sol–gel growth magnetic properties oxidation state crystal structure XANES Optical and Electronic Materials Characterization and Evaluation of Materials Electronics and Microelectronics, Instrumentation Solid State Physics
Content Type	Text
Resource Type	Article
Subject	Materials Chemistry Electronic, Optical and Magnetic Materials Condensed Matter Physics Electrical and Electronic Engineering

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