Moessbauer spectroscopy study of amorphous Fe/sub 87/B/sub 11/Au/sub 2/ ribbon and its crystallization products
Substantial increases in Fe saturation magnetization have been obtained in amorphous Fe-B containing small concentrations of gold. This material is also stable above 300 K, and thus has considerable practical significance. This paper reports the results of an investigation of amorphous Fe/sub 87/B/sub 11/Au/sub 2/ ribbon and its crystallization products based on /sup 57/Fe Moessbauer spectroscopy. The amorphous ribbon exhibits a broad magnetic hyperfine splitting pattern typical of a metallic glass with an effective hyperfine field, H/sub eff/ = 257 kOe, and an isomer shift of 0.058 mm/s relative to metallic Fe at 300 K. The spectra of samples annealed for 25 min between T/sub A/ = 618 K and 708 K arise from a metastable amorphous phase of Fe-Au-B and a crystalline ..cap alpha..-Fe phase. H/sub eff/ of the metastable amorphous phase decreases with respect to increased annealing temperature. However, H/sub eff/ of the ..cap alpha..-Fe phase increases from 331 kOe for samples annealed at 618 K to 334 kOe for those annealed at 708 K. This increase can be attributed to an increased content of Au in the ..cap alpha..-Fe phase. Annealing the samples at temperatures above 753 K for 25 min yields crystalline ..cap alpha..-Fe and the intermetallic compound Fe/sub 2/B.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5830147
- Report Number(s):
- IS-M-459; CONF-831187-1; ON: DE83018091
- Resource Relation:
- Conference: MMM conference, Pittsburg, PA, USA, 8 Nov 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BORON ALLOYS
RECRYSTALLIZATION
GOLD ALLOYS
IRON 57
MOESSBAUER EFFECT
IRON ALLOYS
METALLIC GLASSES
AMORPHOUS STATE
ANNEALING
HYPERFINE STRUCTURE
ISOMER SHIFT
MAGNETIC FIELDS
SHEETS
ALLOYS
EVEN-ODD NUCLEI
HEAT TREATMENTS
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
NUCLEI
STABLE ISOTOPES
360102* - Metals & Alloys- Structure & Phase Studies