Systematics of the pressure dependence of the electron density at the nucleus for the elements Ag through Te: Pressure dependence of the Moessbauer isomer shift for Sn and Sb

Journal Article · Wed Feb 01 04:00:00 EST 1978 · Phys. Rev., B; (United States)

DOI:https://doi.org/10.1103/PhysRevB.17.1015· OSTI ID:5201652

Williamson, D L; Dale, J H; Josephson, W D; Roberts, L D

Experimental Moessbauer isomer-shift studies have shown that when ..beta..-Sn is compressed, the charge density rho (0) at the nucleus decreases, viz., partial lnrho (0)/partial lnV > 0. This fact suggested a study of the systematics of partial lnrho (0)/partial lnV for the Ag row of the Periodic Table. We have calculated partial lnrho (0)/partial lnV for the elements Ag through Te in a Hartree-Dirac-Wigner-Seitz approximation. Exchange is treated through an exchange potential. These calculations indicate that both valence- and core-electron contributions play a role in determining partial lnrho (0)/partial lnV. In the Wigner-Seitz model, a positive sign for partial lnrho (0)/partial lnV for ..beta..-Sn (i.e., the sign which agrees with experimental high-pressure Moessbauer isomer-shift studies) is obtained only if the exchange multiplier lies in the range 1.3 < or = zeta < or = 1.5, where zeta = 1.5 corresponds to full Slater exchange. These Wigner-Seitz-model calculations indicate a negative sign for partial lnrho (0)/partial lnV for Ag, Cd, and In, and a positive sign for this derivative for Sb, and Te. The sign for Sn depends on zeta, as indicated.

• Research Organization: Department of Physics and Astronomy, University of North Carolina, Chapel Hill, North Carolina 27514
• OSTI ID: 5201652
• Journal Information: Phys. Rev., B; (United States), Journal Name: Phys. Rev., B; (United States) Vol. 17:3; ISSN PLRBA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
ANTIMONY
CADMIUM
ELECTRON DENSITY
ELEMENTS
INDIUM
METALS
MOESSBAUER EFFECT
PRESSURE DEPENDENCE
SEMIMETALS
SILVER
STRUCTURAL CHEMICAL ANALYSIS
TELLURIUM
TIN
TRANSITION ELEMENTS