Published October 1987 | Version v1
Journal article Metadata-only

A search for anharmonic effects in NpO2 at low temperature by neutron diffraction

Creators

  • 1. Commission of the European Communities, Karlsruhe (Germany, F.R.). European Inst. for Transuranium Elements
  • 2. CEA Centre d'Etudes Nucleaires de Grenoble, 38 (France). Dept. de Recherche Fondamentale
  • 3. Institut Max von Laue - Paul Langevin, 38 - Grenoble (France)

Description

A single crystal neutron diffraction experiment has been performed on NpO2 to search for anomalies in the Debye-Waller factors associated with the as yet unexplained 25 K phase transition. Data were collected out to a maximum momentum transfer of 16 A-1. A detailed analysis shows no significant changes of the thermal parameters when cooling below 25 K. This result effectively eliminates the most recent proposal that a dynamical distortion of the oxygen sublattice occurs. (author)

Additional details

Publishing Information

Journal Title
Solid State Commun.
Journal Volume
64
Journal Issue
1
Series
Solid State Commun.
Journal Page Range
149-152
ISSN
0038-1098
CODEN
SSCOA

INIS

Country of Publication
United Kingdom
Country of Input or Organization
United Kingdom
INIS RN
19026819
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
ANHARMONIC CRYSTALS; DEBYE-WALLER FACTOR; MOMENTUM TRANSFER; MONOCRYSTALS; NEPTUNIUM OXIDES; NEUTRON DIFFRACTION; PHASE TRANSFORMATIONS; STRUCTURE FACTORS; VERY LOW TEMPERATURE
Descriptors DEC
ACTINIDE COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; CRYSTALS; DIFFRACTION; NEPTUNIUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; SCATTERING; TRANSURANIUM COMPOUNDS