Tunable thermal expansion behavior in the intermetallic YbGaGe
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We investigate the effects of carbon and boron doping on the thermal expansion of the hexagonal (P6{sub 3}/mmc) intermetallic YbGaGe. X-ray powder diffraction was used to measure the lattice constants on pure and doped (C or B at nominal levels of 0.5%) samples from T{approx}10 K to T{approx}300 K. Also measured were resistivity, specific heat, and magnetic susceptibility. While the pure YbGaGe samples exhibit positive thermal volume expansion (V{sub 300K}-V{sub 10K})/V{sub 300K}=0.94, the volume expansion in the lightly C- or B-doped samples changes slope and tends toward zero-volume expansion. Such a strong response to light doping suggests that the underlying mechanism for the reported zero-volume expansion is substitutional disorder, and not the previously proposed valence fluctuations.
- OSTI ID:
- 20718993
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 17 Vol. 71; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
Similar Records
Ytterbium divalency and lattice disorder in near-zero thermal expansion YbGaGe
Ytterbium divalency and lattice disorder in near-zero thermalexpansion YbGaGe
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BORON ADDITIONS
CARBON ADDITIONS
DOPED MATERIALS
ELECTRIC CONDUCTIVITY
FLUCTUATIONS
GALLIUM ALLOYS
GERMANIUM ALLOYS
HCP LATTICES
LATTICE PARAMETERS
MAGNETIC SUSCEPTIBILITY
SPECIFIC HEAT
THERMAL EXPANSION
VALENCE
VISIBLE RADIATION
X-RAY DIFFRACTION
YTTERBIUM ALLOYS