MOSSBAUER EFFECT IN METALLIC IRON

Journal Article · Sat Dec 01 04:00:00 EST 1962 · Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D

DOI:https://doi.org/10.1103/PhysRev.128.2207· OSTI ID:4775589

Preston, R S; Hanna, S S; Heberle, J

The Mossbauer effect in metallic iron has been studied from 4 to 1300 deg K, with particular emphasis on the region near the Curie temperature at 1043 deg K. Measurements of the internal field H/sub n/ at the nucleus agree with nuclear magnetic resonance measurements and follow closely, but not exactly, the saturation magnetization curve of iron. No internal field is observed above the Curie temperature. At room temperature H/sub n/ = 330 plus or minus 3 kOe. The ratio of magnetic moments of the two lowest levels of Fe/sup 57/ is mu /sub 1// mu /sub 0/ = -1.715 plus or minus 0.004. The observed temperature shift in the energy of the resonant radiation may be attributed chiefly to relativistic time dilation. ln the low-temperature region the variation is nonlinear and compatible with a Debye temperature theta = 400 plus or minus 30 deg K, although the data indicate that theta is not strictly independent of temperature. At high temperatures, the classical limit (l/E) partial delta E/ partial delta T = -3k/2Mc/sub 2/ for the relativistic shift is attained and perhaps exceeded. Disagreement with the classical limit would indicate a temperature variation in the isomer shift. At the Curie point and at the transition from alpha to gamma iron, the discontinuities observed in the temperature shift are too great to be attributed to the relativistic shift. If attributed to the isomer shift, these discontinuities indicate that the electron density at the nucleus increases at the transitions from the ferromagnetic to the paramagnetic state and from alpha to gamma iron. The strength of the resonant absorption was also determined as a function of temperature. These measurements are compatible with a Debye temperature that falls from about 400 to 300 deg K in passing from low to high temperatures over the range studied. (auth)

• Research Organization: Argonne National Lab., Ill.
• NSA Number: NSA-17-003626
• OSTI ID: 4775589
• Report Number(s): TID-16872; 0031-899X
• Journal Information: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 128; ISSN PHRVA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ABSORPTION
CURIE POINT
DEBYE TEMPERATURE
DENSITY
ELECTRONS
ENERGY LEVELS
FERROMAGNETIC MATERIALS
IRON
ISOMERS
LATTICES
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC MOMENTS
MAGNETISM
MEASURED VALUES
METALS
MOESSBAUER EFFECT
NUCLEAR MAGNETIC RESONANCE
NUCLEI
OSCILLATIONS
PARAMAGNETISM
PHASE SHIFT
PHYSICS
RADIATIONS
RELATIVITY THEORY
TEMPERATURE
TRANSIENTS
VARIATIONS