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Synthesis of α″-Fe16N2 iron nitride by means of nitrogen-ion implantation into iron thin films.
- Source :
- Journal of Materials Science; Apr1997, Vol. 32 Issue 9, p2255-2261, 7p, 4 Diagrams, 1 Chart, 7 Graphs
- Publication Year :
- 1997
-
Abstract
- Nitrogen ions were implanted into [1 0 0] oriented α-Fe thin films on MgO (1 0 0) substrates at room temperature. The films were annealed at a low temperature of 473 K. α″-Fe<subscript>16</subscript>N<subscript>2</subscript> and α′-martensite phases were formed and the volume fractions of these nitride phases were estimated from the X-ray diffraction patterns. When the film thickness was 250 nm, α″-Fe<subscript>16</subscript>N<subscript>2</subscript> was formed directly by ion implantation and the maximum volume fraction was about 12%. For the case of 50 nm thick films, no α″-Fe<subscript>16</subscript>N<subscript>2</subscript> but α′-martensite was formed after nitrogen-ion implantation, and the volume fraction of the martensite exceeded 90%. By post annealing at 473 K, α″-Fe<subscript>16</subscript>N<subscript>2</subscript> was formed, when the implanted specimens were coated with gold or copper films. The volume fraction of α″-Fe<subscript>16</subscript>N<subscript>2</subscript> reached about 36%. A SQUID magnetic measurement showed that the saturation magnetization of the nitrogen-implanted 250 nm thick iron films was a few per cent larger than that of unimplanted iron films. [ABSTRACT FROM AUTHOR]
- Subjects :
- NITROGEN
ION bombardment
THIN films
MAGNESIUM oxide
THICK films
IRON
Subjects
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 32
- Issue :
- 9
- Database :
- Complementary Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 52536171
- Full Text :
- https://doi.org/10.1023/A:1018568015538