Accession Number : AD0638006

Title :   ISOMER SHIFT OF FE57 IN TRANSITION METALS UNDER PRESSURE.

Corporate Author : ILLINOIS UNIV URBANA DEPT OF PHYSICS

Personal Author(s) : INGALLS,R. ; Drickamer,H. G. ; De Pasquali,G.

Report Date : 1966

Pagination or Media Count : 20

Abstract : Isomer shifts of Fe57 in several transition metals were measured as a function of pressure up to nearly 300 kbar. The host metals studied were V, Cr, Co, Ni, Nb, Mo, Pd, Ta, W, Pt, and Au. The data are discussed in terms of the volume dependence of (1) the density at the nucleus from 4s-like conduction electrons and (2) the density at the nucleus from 3s core electrons which are shielded by the 3d-like conduction electrons. Results of a previous paper regarding amount of 4s character, n-s, and amount of 3d character, n-d, in the iron impurity atom, are used. The data are shown to be consistent with: (1) n-s decreasing or n-d increasing, or both as one goes through each transition metal series toward more d electrons of the host and (2) n-s decreasing or n-d increasing, or both, as pressure is applied to the host metal. The degree of the effect (2) is shown to be related to the calibration constant of the isomer shift. (Author)

Descriptors :   (*IRON, *MOSSBAUER EFFECT), (*TRANSITION METALS, MOSSBAUER EFFECT), NUCLEAR ISOMERS, PRESSURE, ATOMIC ORBITALS, IMPURITIES, VANADIUM, CHROMIUM, COBALT, NICKEL, NIOBIUM, MOLYBDENUM, PALLADIUM, TANTALUM, TUNGSTEN, PLATINUM, GOLD

Subject Categories : Atomic and Molecular Physics and Spectroscopy
      Nuclear Physics & Elementary Particle Physics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE