skip to main content

Title: Relativistic effects on the thermal expansion of the actinide elements

The room-temperature linear thermal-expansion coefficient is calculated for the light actinides thorium, protactinium, uranium, neptunium, and plutonium for the fcc crystal structure. The relativistic spin-orbit interaction is included in these calculations. We show that the spin-orbit splitting of the 5{ital f} band gives rise to a considerable increase of the thermal expansion and to a large extent explains the observed anomalously large thermal expansion for the neptunium and plutonium metals.
Authors:
; ; ;  [1]
  1. (Condensed Matter Theory Group, Physics Department, University of Uppsala, Box 530, S-75121 Uppsala (Sweden))
Publication Date:
OSTI Identifier:
6389196
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review, B: Condensed Matter; (USA); Journal Volume: 42:7
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; NEPTUNIUM; THERMAL EXPANSION; PLUTONIUM; PROTACTINIUM; THORIUM; URANIUM; ACTINIDES; FCC LATTICES; L-S COUPLING; MEDIUM TEMPERATURE; COUPLING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CUBIC LATTICES; ELEMENTS; EXPANSION; INTERMEDIATE COUPLING; METALS; TRANSURANIUM ELEMENTS 360104* -- Metals & Alloys-- Physical Properties; 050700 -- Nuclear Fuels-- Fuels Production & Properties