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Exceptional elevated temperature behavior of nanocrystalline stoichiometric Y2Fe14B alloys with La or Ce substitutions.
- Source :
- Journal of Materials Science; Dec2019, Vol. 54 Issue 23, p14577-14587, 11p, 1 Diagram, 8 Graphs
- Publication Year :
- 2019
-
Abstract
- Considering that both La<subscript>2</subscript>Fe<subscript>14</subscript>B and Ce<subscript>2</subscript>Fe<subscript>14</subscript>B compounds exhibit similar weak temperature-dependent anisotropic fields (H<subscript>A</subscript>) as Y<subscript>2</subscript>Fe<subscript>14</subscript>B, this work aims to clarify the elevated temperature behavior of melt-spun nanocrystalline La- or Ce-partially substituted stoichiometric Y<subscript>2</subscript>Fe<subscript>14</subscript>B alloys containing no critical rare earth elements. The results show that La-substituted (Y<subscript>1−x</subscript>La<subscript>x</subscript>)<subscript>2</subscript>Fe<subscript>14</subscript>B alloys (x = 0–0.5) show exceptional elevated temperature behavior, manifested by the increased coercivity with increasing temperature. For the Ce-substituted (Y<subscript>1−x</subscript>Ce<subscript>x</subscript>)<subscript>2</subscript>Fe<subscript>14</subscript>B alloys, only x = 0.1 and 0.2 alloys show the similar trend. Both the temperature coefficient of remanence α and coercivity β can be improved by La-substituted, indicating partial substitution La can effectively enhance the thermal stability of Y<subscript>2</subscript>Fe<subscript>14</subscript>B alloy. However, excess La or Ce substitution would reduce α and β value, resulting in the deterioration of thermal stability. Highest β values of 0.05 and − 0.08 have been obtained in (Y<subscript>0.9</subscript>La<subscript>0.1</subscript>)<subscript>2</subscript>Fe<subscript>14</subscript>B alloy at 300–400 K and (Y<subscript>0.8</subscript>La<subscript>0.2</subscript>)<subscript>2</subscript>Fe<subscript>14</subscript>B alloy at 300–500 K, respectively. In addition, Ce substitution can effectively enhance the coercivity of Y<subscript>2</subscript>Fe<subscript>14</subscript>B alloy at room temperature and La substitution does not show a beneficial effect on the room-temperature magnetic properties. This work is beneficial for developing high-performance/cost ratio permanent magnets based on abundant rare earth elements with superior thermal stability. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 54
- Issue :
- 23
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 138578318
- Full Text :
- https://doi.org/10.1007/s10853-019-03916-8