NDLI: Improved performance of SrFe<sub>12</sub>O<sub>19</sub> bulk magnets through bottom-up nanostructuring

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Qiang Saura-Múzquiz, Matilde Song, Jie Bøjesen, Espen Drath Granados-Miralles, Cecilia Dong, Mingdong Stingaciu, Marian Christensen, Mogens Eikeland, Espen
Copyright Year	2016
Abstract	The influence of synthesis and compaction parameters is investigated with regards to formation of high performance SrFe12O19 bulk magnets. The produced magnets consist of highly aligned, single-magnetic domain nanoplatelets of SrFe12O19. The relationship between the magnetic performance of the samples and their structural features is established through systematic characterization by Vibrating Sample Magnetometry (VSM) and Rietveld refinement of powder X-ray diffraction data (PXRD). The analysis is supported by complementary techniques including Transmission Electron Microscopy (TEM), Atomic Force Microscopy (AFM) and X-ray pole figure measurements. SrFe12O19 hexagonal nanoplatelets with various sizes are synthesized by a supercritical hydrothermal flow method. The crystallite sizes are tuned by varying the Fe/Sr ratio in the precursor solution. Compaction of SrFe12O19 nanoplatelets into bulk magnets is performed by Spark Plasma Sintering (SPS). Rietveld refinement of the pressed pellets and texture analysis of pole figure measurements reveal that SPS pressing produces a high degree of alignment of the nanoplatelets, achieved without applying any magnetic field prior or during compaction. The highly aligned nanocrystallites combined with crystal growth during SPS give rise to an enormous enhancement of the magnetic properties compared to the as-synthesized powders, leading to high performance bulk magnets with energy products of 26 kJ m−3.
Starting Page	2857
Ending Page	2866
Page Count	10
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	8
Issue Number	5
Journal	Nanoscale
DOI	10.1039/c5nr07854g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Super Proton Synchrotron Rietveld refinement Crystallite Supercritical fluid Atomic Force Microscopy Rietveld X-ray crystallography Spark plasma sintering Transmission electron microscopy Hydrothermal synthesis Atomic-force microscopy SPS Transmission Electron Microscopy Magnetic field
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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