Synthesis and microwave absorbing properties of La-doped Sr-hexaferrite nanopowders via sol–gel auto-combustion method

Synthesis and microwave absorbing properties of La-doped Sr-hexaferrite nanopowders via sol–gel... La-doped Sr-hexaferrite (Sr1−x La x Fe12O19) (x = 0.05, 0.10, 0.15, 0.20) nanopowders with particle size ranging from 80 to 110 nm were successfully synthesized by sol–gel auto-combustion. The phase formation temperature increases, while the particle size decreases as the La-doping content goes up. The partial substitution of Sr2+ by La3+ results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe3+ with different valences, which leads to the improvement in the dielectric loss and magnetic loss. Therefore, both the microwave absorbing abilities and absorbing frequency ranges are tuned by La-doping. The synthesized Sr-hexaferrite nanopowders with doping element content of 0.10 demonstrate the fine broad microwave absorbing properties. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Rare Metals Springer Journals

Synthesis and microwave absorbing properties of La-doped Sr-hexaferrite nanopowders via sol–gel auto-combustion method

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Publisher
Nonferrous Metals Society of China
Copyright
Copyright © 2015 by The Nonferrous Metals Society of China and Springer-Verlag Berlin Heidelberg
Subject
Materials Science; Metallic Materials; Nanotechnology; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Inorganic Chemistry; Physical Chemistry
ISSN
1001-0521
eISSN
1867-7185
D.O.I.
10.1007/s12598-015-0671-6
Publisher site
See Article on Publisher Site

Abstract

La-doped Sr-hexaferrite (Sr1−x La x Fe12O19) (x = 0.05, 0.10, 0.15, 0.20) nanopowders with particle size ranging from 80 to 110 nm were successfully synthesized by sol–gel auto-combustion. The phase formation temperature increases, while the particle size decreases as the La-doping content goes up. The partial substitution of Sr2+ by La3+ results in the suppression effects on the growth-up of the crystallites and the enhancement of the electron hopping between Fe3+ with different valences, which leads to the improvement in the dielectric loss and magnetic loss. Therefore, both the microwave absorbing abilities and absorbing frequency ranges are tuned by La-doping. The synthesized Sr-hexaferrite nanopowders with doping element content of 0.10 demonstrate the fine broad microwave absorbing properties.

Journal

Rare MetalsSpringer Journals

Published: Dec 19, 2015

References

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