Deuteron density modulation of D atoms in PdD/sub 1-x/

Journal Article · Sun Jul 01 04:00:00 EDT 1979 · AIP (Am. Inst. Phys.) Conf. Proc.; (United States)

OSTI ID:6013507

Mueller, M H; Brun, T O; Hitterman, R L; Knott, H W; Satterhwaite, C B; Ellis, T E

Recent resistivity and neutron diffraction measurements have provided evidence for ordering of D(H) atons on the octahedral interstitial sites of PdD/sub 1-x/. This order-disorder transition is responsible for the ''50 K anomaly'' which has been reported in many of the physical properties. Neutron diffraction measurements on a PdD/sub 0.76/ single crystal revealed satellite reflection at (4/5,2/5,0) and equivalent positions. These satellites can be accounted for by a multi-domained tetragonal unit cell with a/sub t/=a/sub c/ ..sqrt..5/2 and c/sub t/=c/sub a/. This ordered state can be described as a deuteron density wave along a <420> cubic direction. This density is modulated such that four fully occupied planes (Pd D) are followed by a vacant plane (Pd only).

• Research Organization: Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 6013507
• Report Number(s): CONF-790341-
• Journal Information: AIP (Am. Inst. Phys.) Conf. Proc.; (United States), Journal Name: AIP (Am. Inst. Phys.) Conf. Proc.; (United States) Vol. 53:1; ISSN APCPC
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
&amp; Refractories-- Structure &amp; Phase Studies
COHERENT SCATTERING
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DEUTERIDES
DEUTERIUM COMPOUNDS
DIFFRACTION
DOMAIN STRUCTURE
HYDROGEN COMPOUNDS
INTERSTITIALS
NEUTRON DIFFRACTION
ORDER-DISORDER TRANSFORMATIONS
PALLADIUM COMPOUNDS
PHASE TRANSFORMATIONS
POINT DEFECTS
SCATTERING
STOICHIOMETRY
SUPERLATTICES
TRANSITION ELEMENT COMPOUNDS
VACANCIES