Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 14, Pages 3068-3071Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.3068
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Group IV transition metals titanium, zirconium, and hafnium are expected to transform from an ambient hexagonal close packed (hcp, alpha -phase) to a body centered cubic (bcc, beta -phase) at high pressures. This transition path is usually facilitated by the occurrence of an intermediate hexagonal phase (distorted bcc, omega -phase). The existence of a bce phase in zirconium and hafnium at high pressures has been known for the past ten years; however, its occurrence in titanium has been theoretically predicted but never observed. We report a novel unexpected transformation in titanium metal from an omega phase to an orthorhombic phase (distorted hcp, gamma -phase) at a pressure of 116 +/- 4 GPa.
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