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New delta (distorted-bcc) titanium to 220 GPa.
Y Akahama1, H Kawamura, T Le Bihan
1Faculty Science, Himeji Institute of Technology, 3-2-1 Koto, Kamigohri, Hyogo 678-1297, Japan.
Physical Review Letters
|January 22, 2002
Summary
Titanium undergoes structural phase transitions under high pressure. At 140 GPa, it transforms from hexagonal to an orthorhombic phase via an intermediate gamma phase, both featuring unique zigzag chain structures.
Area of Science:
- Materials Science
- Condensed Matter Physics
- High-Pressure Physics
Background:
- Titanium is a 3d transition element with complex structural behavior under pressure.
- Understanding its phase transitions is crucial for materials science applications.
Purpose of the Study:
- To investigate the structural phase transitions of titanium at high pressures.
- To characterize the intermediate and high-pressure phases of titanium.
Main Methods:
- Monochromatic synchrotron X-ray diffraction technique was employed.
- Experiments were conducted at room temperature up to 220 GPa.
Main Results:
- At 140 GPa, titanium transformed from hexagonal (omega) to an orthorhombic (delta) phase.
- An intermediate phase (gamma) was observed, featuring a distorted bcc structure.
- Both delta and gamma phases exhibited a unique zigzag-chain-like structure due to orthorhombic distortion.
Conclusions:
- The delta-gamma transition is attributed to the rearrangement of packing between zigzag chains.
- The study elucidates the complex high-pressure structural phases of titanium.