/sup 57/Fe Mossbauer spectroscopy of U/sub 6/Fe
Samples of U/sub 6/Fe were prepared by arc melting U and enriched /sup 57/Fe. The samples display superconducting transitions which are sensitive to long-term exposure to air. Room temperature spectra of U/sub 6/Fe typically display a majority site A (quadrupole splitting ..delta.. = 0.749(3) mm/s, isomer shift delta = 0.482(6) mm/s relative to Cu) and a minority site B (..delta.. = 0.55(3) mm/s, sigma = 0.12(3) mm/s) with the site intensity ratio (I/sub B//I/sub A/) typically 0.05 to 0.10. The I/sub B//I/sub A/ intensity ratio increases upon air exposure of the samples. We have studied Moessbauer spectra as a function of temperature T in the range 15/sup 0/K less than or equal to T less than or equal to 310/sup 0/K paying particular attention to the T-variation of the isomer-shift and recoil-free-fraction of the majority site A. Results indicate a consistent softening of lattice vibrations of U/sub 6/Fe at T approx. = 170/sup 0/K.
- Research Organization:
- Cincinnati Univ., OH (USA). Dept. of Physics; Kentucky Univ., Lexington (USA). Dept. of Physics and Astronomy
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5475089
- Report Number(s):
- CONF-860602-6; ON: DE86014536; TRN: 86-027872
- Resource Relation:
- Conference: 17. rare earth research conference, Hamilton, Ontario, Canada, 8 Jun 1986; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
IRON 57
MOESSBAUER EFFECT
IRON ALLOYS
STRUCTURAL CHEMICAL ANALYSIS
VIBRATIONAL STATES
URANIUM BASE ALLOYS
HYPERFINE STRUCTURE
INTERMETALLIC COMPOUNDS
ISOMER SHIFT
LOW TEMPERATURE
TEMPERATURE DEPENDENCE
VERY LOW TEMPERATURE
ACTINIDE ALLOYS
ALLOYS
ENERGY LEVELS
EVEN-ODD NUCLEI
EXCITED STATES
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
NUCLEI
STABLE ISOTOPES
URANIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies
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