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Related Experiment Videos

High-Pressure Polymorph of Thulium: An X-ray Diffraction Study.

L G Liu, W A Bassett, M S Liu

    Science (New York, N.Y.)
    |April 20, 1973
    PubMed
    Summary
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    Thulium transforms to the samarium-type structure under high pressure, similar to other rare-earth elements. Uniquely, thulium

    Area of Science:

    • Materials Science
    • Condensed Matter Physics
    • Crystallography

    Background:

    • Rare-earth elements exhibit diverse structural phase transitions under pressure.
    • Understanding these transitions is crucial for materials science and condensed matter physics.

    Purpose of the Study:

    • To investigate the structural behavior of thulium under high pressure.
    • To compare thulium's phase transition with other rare-earth elements.

    Main Methods:

    • X-ray diffraction study.
    • Utilized a diamond-anvil press for high-pressure application.
    • Analyzed structural changes at room temperature.

    Main Results:

    • Thulium transforms from hexagonal close-packed (HCP) to samarium-type structure.

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  • The axial ratio (c/a) of HCP thulium is pressure-independent.
  • The transition is reversible and occurs between 60-116 kilobars.
  • Conclusions:

    • Thulium's phase transition is similar to other rare-earth elements but with unique pressure-independent axial ratio behavior.
    • The observed reversibility and distinct axial ratio properties offer insights into rare-earth element physics.
    • Lattice parameters for the samarium-type phase at 116 kbar were determined.