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Title: Non-rare earth magnetic nanoparticles

Abstract

Continuous flow synthetic methods are used to make single phase magnetic metal alloy nanoparticles that do not contain rare earth metals. Soft and hard magnets made from the magnetic nanoparticles are used for a variety of purposes, e.g. in electric motors, communication devices, etc.

Inventors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Virginia Commonwealth Univ., Richmond, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1399092
Patent Number(s):
9,773,594
Application Number:
14/370,138
Assignee:
VIRGINIA COMMONWEALTH UNIVERSITY ARPA-E
DOE Contract Number:
AR0000192
Resource Type:
Patent
Resource Relation:
Patent File Date: 2013 Jan 04
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Carpenter, Everett E., Huba, Zachary J., Carroll, Kyler J., Farghaly, Ahmed, Khanna, Shiv N., Qian, Meichun, and Bertino, Massimo. Non-rare earth magnetic nanoparticles. United States: N. p., 2017. Web.
Carpenter, Everett E., Huba, Zachary J., Carroll, Kyler J., Farghaly, Ahmed, Khanna, Shiv N., Qian, Meichun, & Bertino, Massimo. Non-rare earth magnetic nanoparticles. United States.
Carpenter, Everett E., Huba, Zachary J., Carroll, Kyler J., Farghaly, Ahmed, Khanna, Shiv N., Qian, Meichun, and Bertino, Massimo. 2017. "Non-rare earth magnetic nanoparticles". United States. doi:. https://www.osti.gov/servlets/purl/1399092.
@article{osti_1399092,
title = {Non-rare earth magnetic nanoparticles},
author = {Carpenter, Everett E. and Huba, Zachary J. and Carroll, Kyler J. and Farghaly, Ahmed and Khanna, Shiv N. and Qian, Meichun and Bertino, Massimo},
abstractNote = {Continuous flow synthetic methods are used to make single phase magnetic metal alloy nanoparticles that do not contain rare earth metals. Soft and hard magnets made from the magnetic nanoparticles are used for a variety of purposes, e.g. in electric motors, communication devices, etc.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 9
}

Patent:

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  • A hydrothermal method for forming nanoparticles of a rare earth element, oxygen and fluorine has been discovered. Nanoparticles comprising a rare earth element, oxygen and fluorine are also described. These nanoparticles can exhibit excellent refractory properties as well as remarkable stability in hydrothermal conditions. The nanoparticles can exhibit excellent properties for numerous applications including fiber reinforcement of ceramic composites, catalyst supports, and corrosion resistant coatings for high-temperature aqueous solutions.
  • A hydrothermal method for forming nanoparticles of a rare earth element, oxygen and fluorine has been discovered. Nanoparticles comprising a rare earth element, oxygen and fluorine are also described. These nanoparticles can exhibit excellent refractory properties as well as remarkable stability in hydrothermal conditions. The nanoparticles can exhibit excellent properties for numerous applications including fiber reinforcement of ceramic composites, catalyst supports, and corrosion resistant coatings for high-temperature aqueous solutions.
  • Permanent magnetic alloys are described which comprise 11.5-12.5% rare earth components of which 6.3-12% is samarium and 0.5-6.2% is yttrium; 2-2.5% hafnium, 19.5-26.5% iron, 7-10.5% copper, and 52-70.7% cobalt, the ranges of the components being in atomic ratios. The alloys are prepared by obtaining 1-50 mu M. Powders of the components, compacting the powder after magnetic field orientation sintering the compacted powders at 1160/sup 0/-1220/sup 0/ for 1-10 hours, cooling the sintered body at a rate of at least 1/sup 0/C./second until the temperature is about 900/sup 0/ C., and then annealing the body at 750/sup 0/-900/sup 0/ C.
  • Insertion of light elements such as H,C, or N in the R.sub.2 Fe.sub.17 (R=rare earth metal) series has been found to modify the magnetic properties of these compounds, which thus become prospective candidates for high performance permanent magnets. The most spectacular changes are increases of the Curie temperature, T.sub.c, of the magnetization, M.sub.s, and of coercivity, H.sub.c, upon interstitial insertion. A preliminary product having a component R--Fe--C,N phase is produced by a chemical route. Rare earth metal and iron amides are synthesized followed by pyrolysis and sintering in an inert or reduced atmosphere, as a result of which, the R--Fe--C,Nmore » phases are formed. Fabrication of sintered rare earth iron nitride and carbonitride bulk magnet is impossible via conventional process due to the limitation of nitridation method.« less