/sup 57/Fe Mossbauer spectroscopy of U/sub 6/Fe
Conference
·
OSTI ID:5475089
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-31109-ENG-38
- OSTI ID:
- 5475089
- Report Number(s):
- CONF-860602-6; ON: DE86014536
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOYS
ENERGY LEVELS
EVEN-ODD NUCLEI
EXCITED STATES
HYPERFINE STRUCTURE
INTERMEDIATE MASS NUCLEI
INTERMETALLIC COMPOUNDS
IRON 57
IRON ALLOYS
IRON ISOTOPES
ISOMER SHIFT
ISOTOPES
LOW TEMPERATURE
MOESSBAUER EFFECT
NUCLEI
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
URANIUM ALLOYS
URANIUM BASE ALLOYS
VERY LOW TEMPERATURE
VIBRATIONAL STATES
360102* -- Metals & Alloys-- Structure & Phase Studies
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACTINIDE ALLOYS
ALLOYS
ENERGY LEVELS
EVEN-ODD NUCLEI
EXCITED STATES
HYPERFINE STRUCTURE
INTERMEDIATE MASS NUCLEI
INTERMETALLIC COMPOUNDS
IRON 57
IRON ALLOYS
IRON ISOTOPES
ISOMER SHIFT
ISOTOPES
LOW TEMPERATURE
MOESSBAUER EFFECT
NUCLEI
STABLE ISOTOPES
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
URANIUM ALLOYS
URANIUM BASE ALLOYS
VERY LOW TEMPERATURE
VIBRATIONAL STATES