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Title: Complex additive systems for Mn-Zn ferrites with low power loss

Mn-Zn ferrites were prepared via an oxalate-based wet-chemical synthesis process. Nanocrystalline ferrite powders with particle size of 50 nm were sintered at 1150 °C with 500 ppm CaO and 100 ppm SiO{sub 2} as standard additives. A fine-grained, dense microstructure with grain size of 4–5 μm was obtained. Simultaneous addition of Nb{sub 2}O{sub 5}, ZrO{sub 2}, V{sub 2}O{sub 5}, and SnO{sub 2} results low power losses, e.g., 65 mW/cm{sup 3} (500 kHz, 50 mT, 80 °C) and 55 mW/cm{sup 3} (1 MHz, 25 mT, 80 °C). Loss analysis shows that eddy current and residual losses were minimized through formation of insulating grain boundary phases, which is confirmed by transmission electron microscopy. Addition of SnO{sub 2} increases the ferrous ion concentration and affects anisotropy as reflected in permeability measurements μ(T)
Authors:
;  [1]
  1. University of Applied Sciences Jena, Department of SciTec, C.-Zeiss-Promenade 2, 07745 Jena (Germany)
Publication Date:
OSTI Identifier:
22403035
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CALCIUM OXIDES; CONCENTRATION RATIO; CRYSTALS; EDDY CURRENTS; FERRITES; GRAIN BOUNDARIES; GRAIN SIZE; MANGANESE COMPOUNDS; NANOSTRUCTURES; NIOBIUM OXIDES; PARTICLE SIZE; PERMEABILITY; POWER LOSSES; SILICON OXIDES; TIN OXIDES; TRANSMISSION ELECTRON MICROSCOPY; VANADIUM OXIDES; ZINC COMPOUNDS; ZIRCONIUM OXIDES