Quenching and electron-irradiation effects in ordered US -PdH(D)/sub 0. 63/ around the resistivity anomaly near 50 K

Journal Article · Sat Feb 15 00:00:00 EST 1986 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.33.2286· OSTI ID:6197876

Vajda, P; Burger, J P; Daou, J N; Lucasson, A

US -PdH(D)/sub 0.63/ specimens had been quenched across the 50-K anomaly and/or bombarded with electrons of 0.35--0.8 MeV energy at 20 K. They exhibited after each treatment a residual-resistivity decrease, - rho, which annealed upon heating in the anomaly region. A kinetic analysis of the recovery process yielded an activation energy for H-defect migration of E/sub m/(H,D) = 50 +- 15 meV for a first-order reaction. An investigation of the isotope-dependent radiation-induced - rho/sub irr/ as a function of the electron energy led, by fitting theoretical collision cross sections, to a displacement threshold assimilated with a binding energy of hydrogen in its sublattice, E/sub b/approx.0.01 eV, and to a defect resistivity, rho/sub def//sup H,D/ = -6 cm/unit concentration. The proposed defect configuration is occupational disorder in the hydrogen-vacancy sublattice, created by site interchange of H atoms with vacant octahedral sites of the Pd lattice. This leads to an effective redistribution of the Ni/sub n/Mo (n = 1--4) type microdomains (Ni equivalent to H, Mo equivalent to H vacancy) as observed by neutron scattering in the anomaly region, by locally forming Ni/sub n/ +- 1Mo-type cells of different symmetry.

• Research Organization: Hydrogene et Defauts dans les Metaux, Btiment 350, Universite ParisSud, F-91405 Orsay, France
• OSTI ID: 6197876
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 33:4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PALLADIUM HYDRIDES
PHYSICAL RADIATION EFFECTS
CRITICAL TEMPERATURE
ELECTRIC CONDUCTIVITY
ELECTRONS
ISOTOPE EFFECTS
KEV RANGE 100-1000
PHASE STUDIES
QUENCHING
SPECIFIC HEAT
ELECTRICAL PROPERTIES
ELEMENTARY PARTICLES
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HYDRIDES
HYDROGEN COMPOUNDS
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LEPTONS
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360206* - Ceramics
Cermets
& Refractories- Radiation Effects