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Properties of isolated single crystalline and textured polycrystalline nano/sub-micrometre Nd2Fe14B particles obtained from milling of HDDR powder

Pal, S. K. and Güth, K. and Woodcock, T. G. and Schultz, L. and Gutfleisch, O. (2013):
Properties of isolated single crystalline and textured polycrystalline nano/sub-micrometre Nd2Fe14B particles obtained from milling of HDDR powder.
In: Journal of Physics D: Applied Physics, IOP Publishing, p. 375004, 46, (37), ISSN 0022-3727,
[Online-Edition: http://dx.doi.org/10.1088/0022-3727/46/37/375004],
[Article]

Abstract

Textured, polycrystalline Nd2Fe14B powders, produced by dynamic hydrogenation disproportionation desorption and recombination (d-HDDR) were further processed by wet and surfactant-assisted ball milling. After 4 h of milling at 400 rpm in absolute ethanol and heptane + oleic acid, the polycrystalline d-HDDR particles had disintegrated, via intergranular fracture, into the individual grains i.e. isolated single crystalline particles of size 200 to 500 nm. An excellent degree of alignment was produced in the single crystalline particles using an applied magnetic field. This was reflected in the remanence of the field-aligned single crystalline powder (148.1 emu g−1) which was far higher than that of field-aligned un-milled d-HDDR powder (119.5 emu g−1). Milling the single crystalline powder further at 800 rpm in the same media produced polycrystalline flakes of size 0.2 to 1.0 µm. The polycrystalline flakes showed (0 0 l) in-plane texture and thus oriented edge to edge in an applied field.

Item Type: Article
Erschienen: 2013
Creators: Pal, S. K. and Güth, K. and Woodcock, T. G. and Schultz, L. and Gutfleisch, O.
Title: Properties of isolated single crystalline and textured polycrystalline nano/sub-micrometre Nd2Fe14B particles obtained from milling of HDDR powder
Language: English
Abstract:

Textured, polycrystalline Nd2Fe14B powders, produced by dynamic hydrogenation disproportionation desorption and recombination (d-HDDR) were further processed by wet and surfactant-assisted ball milling. After 4 h of milling at 400 rpm in absolute ethanol and heptane + oleic acid, the polycrystalline d-HDDR particles had disintegrated, via intergranular fracture, into the individual grains i.e. isolated single crystalline particles of size 200 to 500 nm. An excellent degree of alignment was produced in the single crystalline particles using an applied magnetic field. This was reflected in the remanence of the field-aligned single crystalline powder (148.1 emu g−1) which was far higher than that of field-aligned un-milled d-HDDR powder (119.5 emu g−1). Milling the single crystalline powder further at 800 rpm in the same media produced polycrystalline flakes of size 0.2 to 1.0 µm. The polycrystalline flakes showed (0 0 l) in-plane texture and thus oriented edge to edge in an applied field.

Journal or Publication Title: Journal of Physics D: Applied Physics
Volume: 46
Number: 37
Publisher: IOP Publishing
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Functional Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Mar 2014 09:43
Official URL: http://dx.doi.org/10.1088/0022-3727/46/37/375004
Identification Number: doi:10.1088/0022-3727/46/37/375004
Funders: The authors are grateful for the financial support from Siemens/DAAD Post Graduate Programme
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