THERMAL MOTION IN PALLADIUM HYDRIDE STUDIED BY MEANS OF ELASTIC AND INELASTIC SCATTERING OF NEUTRONS

Journal Article · Thu Sep 01 00:00:00 EDT 1960 · Physica

DOI:https://doi.org/10.1016/0031-8914(60)90064-1· OSTI ID:4107501

Bergsma, J; Goedkoop, J A

A single-crystal neutron-diffraction investigation of electrolytically loaded palladium hydride of composition PdH/sub 0.6//sub 3/ confirms the NaCl type arrangement found previously for material loaded from the gas phase. The root-mean-square displacements due to thermal motion of the palladium and hydrogen atoms at room temperature are found to be 0.10 plus or minus 0.01 and 0.24 plus or minus 0.02 A, respectively. Measurements of the total neutron scattering cross section as a function of neutron energy and of the energy distribution of 0.004-ev neutrons scattered at 90 deg are reported and interpreted in terms of an Einstein model for the proton vibrations with a fundamental frequency corresponding to 0.056 plus or minus 0.002 ev. From this the root-mean-square displacement of the protons relative to the palladium sublattice at room temperature is estimated to be 0.22 plus or minus 0.02 A, in agreement with the values found by diffraction. The cold neutron scattering data give information about the heat motion of the palladium atoms. Interpreted on a Debye model they yield a Debye temperature of 300 plus or minus 25 deg K and a root-mean-square displacement of 0.10 plus or minus 0.10 A. (auth)

• Research Organization: Institutt for Atomenergi, Kjeller, Norway
• NSA Number: NSA-15-006434
• OSTI ID: 4107501
• Journal Information: Physica, Vol. Vol: 26; Other Information: Orig. Receipt Date: 31-DEC-61
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

METALS, CERAMICS, AND OTHER MATERIALS
ATOMS
CROSS SECTIONS
DEBYE MODEL
DIFFRACTION
EINSTEIN CRYSTAL MODEL
EINSTEIN MODEL
ELECTRIC CHARGES
ENERGY
FREQUENCY
GASES
HEATING
HYDROGEN
LATTICES
MATHEMATICS
MEASURED VALUES
MONOCRYSTALS
NEUTRONS
OSCILLATIONS
PALLADIUM HYDRIDES
PARTICLE MODELS
PROTONS
SCATTERING
SODIUM CHLORIDES
STANDARDS
TEMPERATURE
THERMAL DIFFUSION