Debye temperature and static displacements in LuH/sub x/ single crystals from energy dispersive x-ray diffraction

Conference · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5701705

Metzger, T H; Vajda, P; Daou, J N

Integrated Bragg intensities of LuH/sub x/ along the hexagonal c-direction have been measured by energy-dispersive x-ray diffraction as a function of temperature and hydrogen concentration x less than or equal to 0.133 H/Lu. From the temperature-dependent measurements we show the Debye temperature THETA/sub D/ to increase linearly with the hydrogen content ..delta..THETA/sub D//..delta..x = 0.75K/% H/Lu. For pure Lu we find THETA/sub D/ = 157K +- 1K. From static Debye-Waller factor measurements (at T = 17K) we determined the displacements of the Lu atoms close to hydrogen on tetrahedral sites (u/sub 1st shell/ = 0.09 +- 0.002 A and u/sub 2nd shell/ = 0.03 +- 0.002 A. We demonstrate that the static Debye-Waller factor is not very sensitive to pair formation of hydrogen atoms. Therefore the measurements gave no indication of hydrogen pairs on adjacent tetrahedral sites.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5701705
• Report Number(s): BNL-36350; CONF-850303-1; ON: DE85010961
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
BRAGG REFLECTION
CHEMICAL COMPOSITION
COHERENT SCATTERING
CRYSTALS
DEBYE TEMPERATURE
DEBYE-WALLER FACTOR
DIFFRACTION
HYDRIDES
HYDROGEN COMPOUNDS
LUTETIUM COMPOUNDS
LUTETIUM HYDRIDES
MONOCRYSTALS
QUANTITY RATIO
RARE EARTH COMPOUNDS
REFLECTION
SCATTERING
X-RAY DIFFRACTION