Pressure effects on the martensitic transformation in metallic lithium

Journal Article · Mon Jan 15 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.41.1231· OSTI ID:7173699

Smith, H G ^[1]; Berliner, R ^[2]; Jorgensen, J D ^[3]; Nielsen, M ^[4]; Trivisonno, J ^[5]

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1. Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (USA)
2. Missouri Research Reactor Facility, University of Missouri, Columbia, Missouri 65211 (USA)
3. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (USA)
4. Physics Division, Riso National Laboratory, Roskilde, Denmark (USA)
5. Physics Department, John Carroll University, Cleveland, Ohio 44118 (USA)

High-resolution neutron-diffraction experiments have been performed on polycrystalline lithium-7 metal over a temperature and pressure range of 45 to 300 K and 1 bar to 6.5 kbar. The partial transition from the bcc phase to the 9{ital R}(Sm type) phase occurred at approximately 90 K at 6.5 kbar, about 15 K higher than the similar transition at 1 bar. On warming at 6.5 kbar, the 9{ital R} phase transformed to the fcc phase over a narrow temperature range near 140 K. Above 175 K only the bcc phase was present. Single-crystal measurements confirm the 9{ital R} to fcc transition even at atmospheric pressure.

• DOE Contract Number: AC05-84OR21400; W-31109-ENG-38
• OSTI ID: 7173699
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:2; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALKALI METALS
BCC LATTICES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTAL-PHASE TRANSFORMATIONS
CRYSTALS
CUBIC LATTICES
DIFFRACTION
ELEMENTS
FCC LATTICES
HIGH PRESSURE
LITHIUM
LOW TEMPERATURE
MEDIUM PRESSURE
MEDIUM TEMPERATURE
METALS
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
POLYCRYSTALS
SCATTERING
VERY HIGH PRESSURE
VERY LOW TEMPERATURE