Research of Dysprosium, Terbium and Neodymium Oxides Fluoration

Vladimir Sofronov; Zakhar Ivanov; Yuriy Makaseyev; Tamara Kostareva

doi:10.4028/www.scientific.net/KEM.683.345

Paper Titles

New Radiation-Protective Binder for Special-Purpose Composites
p.318

Spectral-Luminescence Properties of Water Dispersions of CdS and Ag Nanoparticles Stabilized with Na₂SiO₃
p.325

Study of Adsorption Doxorubicin by Iron-Carbon Composite Powders
p.331

Iron-Oxide Pigments Obtained from Sewage Sludge: Properties, Structure, Phase Transformation
p.338

Research of Dysprosium, Terbium and Neodymium Oxides Fluoration
p.345

Effect of Humidity on Characteristics of Hydrogen Sensors Based on Nanocrystalline SnO₂ Thin Films with Various Catalysts
p.353

Study of Sorption on Natural Minerals under Environmental Conditions
p.358

Investigation of Sorption Activity of Brown Peat Moss Powder
p.363

Effect of Surface Topography and Chemical Composition on Wettability of Calcium Phosphate Coatings Formed on Ti-40Nb Alloy
p.370

HomeKey Engineering MaterialsKey Engineering Materials Vol. 683Research of Dysprosium, Terbium and Neodymium...

Research of Dysprosium, Terbium and Neodymium Oxides Fluoration

Abstract:

Production of high energy permanent magnets (HEPM) on the basis of rare-earth metals is one of leading knowledge intensive branches of world industry. Raw materials for production of magnets are magnetic alloys. In order to increase magnetic features scientists implement the additives of certain metals and their compounds, such as dysprosium and terbium additives in substantial amounts – up to 7-8 %.Within the framework of a ladle fluoride technology of HEPM manufacturing on the basis of a system Nd-Fe-B, developed by authors, scientists implement the additives of dysprosium and terbium fluoride, by virtue where of there was conducted a research on fluoration kinetics of corresponding oxides by elemental fluorine. The present article quotes results of such research and defines main kinetic parameters of examined processes – diffusion coefficient, kinetic constant and activation energy. Aiming to cost reduction of fluoride manufacture ammonium fluoride was used as a fluorinating agent by the example of fluoration of neodymium oxide.

You might also be interested in these eBooks

Multifunctional Materials: Development and Application

View Preview

Info:

Periodical:

Key Engineering Materials (Volume 683)

Pages:

345-352

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.683.345

Citation:

Cite this paper

Online since:

February 2016

Authors:

Vladimir Sofronov*, Zakhar Ivanov, Yuriy Makaseyev, Tamara Kostareva

Keywords:

Ammonium Fluoride, Dysprosium Oxide, Fluorine, High Energy Permanent Magnets, Kinetics, Neodymium Oxide, Terbium Oxide

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

Citation:

* - Corresponding Author

References

[1] A.G. Rackov, Chemistry and technology of nonorganic fluorides, Moscow Institute of Chemical Engineering Publ., Moscow [in Russia], (1990).

Google Scholar

[2] F.A. Schmidt, Rare earth/iron fluoride and methods for making and using same, US 5073337 A (1991).

Google Scholar

[3] A. Mukherjeea, A. Awasthia, S. Mishrab, N. Krishnamurthya, Studies on fluorination of Y2O3 by NH4HF2, Thermochimica Acta. 520 (2011) 145–152.

DOI: 10.1016/j.tca.2011.03.032

Google Scholar

[4] A.S. Bujnovskij, V.I. Sachkov, V.L. Sofronov, Basic stages of magnet production by fluoride technology, Advanced Materials Research. 1085 (2015) 209-213.

DOI: 10.4028/www.scientific.net/amr.1085.209

Google Scholar

[5] N.P. Galkin, Basic properties of innorganic fluorides, Atomizdat Publ., Moscow [in Russia], (1976).

Google Scholar

[6] I.L. Knunyanz, The chemical encyclopedia, Soviet encyclopedia Publ., Moscow [in Russia], (1988).

Google Scholar