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Evolution en fonction de la temperature d'un alliage vandium -fer etudte par spectrometrie Mossbauer
Vol. 10, No.2
ABSTRACTS OF PAPERS TO APPEAR IN J. PHYS. CHEM. SOLIDS
spectral separation of the center frequencies of the two transitions, and the time during which the separation was maintained, could be independently adjusted. In this way both the temporal and spectral properties of the phenomenon could be studied. The Pr transition was found to exhibit in time a delayed onset of rapid heating followed by a gradual return to thermal equilibrium. The Pr line shape exhibited heating in those portions of the line localized in frequency nearest to the center of the Ce line. The spectral and temporal behavior of the Pr signal were both sensitive to the degree of Ce excitation as wellas the relative spectral separation between the two lines, The observed effects are attributed to heating of of Pr spin packets induced by hot photons created in the course of the paramagnetic relaxation of the Ce transition. Two simple analytical descriptions of the Ce—Pr interaction are presented. Received 22 July 1971
7.
CARRIER FREEZE-OUT AND ACCEPTOR ENERGIES IN p-TYPE Hg 1~Cd~Te C.T. Elliott, I. Meingailis, T.C. Harman and A.G. Foyt, Lincoln Laboratory, Mass achusetts Institute of Technology, Lexington, Massachusetts
Electrical transport measurements and photoluminescence measurements have been made on p-type Hg~_~Cd~Te, with x in the range 0.2 1— 0.50. Carrier freeze-out was observed with acceptor energies of the order of 20meV. Levels with comparable energies have been observed in photoluminescence. Studies of n-p junctions produced by proton bombardment showed the electrical properties to be free from surface effects. Received 24 September 1971
8.
EVOLUTION EN FONCTION DE LA TEMPERATURE D’UN ALLIAGE VANDIUM—FER ETUDTE PAR SPECTROMETRIE MOSSBAUER
Christian Janot et Bernard George, Laboratoire de Physique du Solide E.N.S.M.I.M. Pare de Saurupt — 54 Nancy (France)
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A vanadium-rich vanadium alloy with 5% iron is studied using Mossbauer effect, in a temperature range from 80K to 1100 K. At about 700 K, a gap can be observed in both recoil-less fraction and isomer shift; at the same time, the two lines of the absorption spectrum have relative intensities which suddenly change. The experimental data are interpreted assuming that above 700K iron atoms are diffusing as interstitials. An alloy obtained by rapid quenching from the liquid state is also studied. Received 15 July 1971 Revised 10 October 1971
ABSTRACTS OF PAPERS TO APPEAR IN J. PHYS. CHEM. SOLIDS
spectral separation of the center frequencies of the two transitions, and the time during which the separation was maintained, could be independently adjusted. In this way both the temporal and spectral properties of the phenomenon could be studied. The Pr transition was found to exhibit in time a delayed onset of rapid heating followed by a gradual return to thermal equilibrium. The Pr line shape exhibited heating in those portions of the line localized in frequency nearest to the center of the Ce line. The spectral and temporal behavior of the Pr signal were both sensitive to the degree of Ce excitation as wellas the relative spectral separation between the two lines, The observed effects are attributed to heating of of Pr spin packets induced by hot photons created in the course of the paramagnetic relaxation of the Ce transition. Two simple analytical descriptions of the Ce—Pr interaction are presented. Received 22 July 1971
7.
CARRIER FREEZE-OUT AND ACCEPTOR ENERGIES IN p-TYPE Hg 1~Cd~Te C.T. Elliott, I. Meingailis, T.C. Harman and A.G. Foyt, Lincoln Laboratory, Mass achusetts Institute of Technology, Lexington, Massachusetts
Electrical transport measurements and photoluminescence measurements have been made on p-type Hg~_~Cd~Te, with x in the range 0.2 1— 0.50. Carrier freeze-out was observed with acceptor energies of the order of 20meV. Levels with comparable energies have been observed in photoluminescence. Studies of n-p junctions produced by proton bombardment showed the electrical properties to be free from surface effects. Received 24 September 1971
8.
EVOLUTION EN FONCTION DE LA TEMPERATURE D’UN ALLIAGE VANDIUM—FER ETUDTE PAR SPECTROMETRIE MOSSBAUER
Christian Janot et Bernard George, Laboratoire de Physique du Solide E.N.S.M.I.M. Pare de Saurupt — 54 Nancy (France)
—
A vanadium-rich vanadium alloy with 5% iron is studied using Mossbauer effect, in a temperature range from 80K to 1100 K. At about 700 K, a gap can be observed in both recoil-less fraction and isomer shift; at the same time, the two lines of the absorption spectrum have relative intensities which suddenly change. The experimental data are interpreted assuming that above 700K iron atoms are diffusing as interstitials. An alloy obtained by rapid quenching from the liquid state is also studied. Received 15 July 1971 Revised 10 October 1971