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| Phase | Crystal structure | Density (g/cm3) |
|---|---|---|
| alpha (α) | simple monoclinic | 19.86 |
| beta (β) | body-centered monoclinic | 17.70 |
| gamma (γ) | face-centered orthorhombic | 17.14 |
| delta (δ) | face-centered cubic | 15.92 |
| delta prime (δ′) | body-centered tetragonal | 16.00 |
| epsilon (ε) | body-centered cubic | 16.51 |
Plutonium occurs in a variety of allotropes, even at ambient pressure. These allotropes differ widely in crystal structure and density; the α and δ allotropes differ in density by more than 25% at constant pressure.
- ^ Wick, O.J., ed. (1967). Plutonium handbook. Vol. I. New York: Gordon and Breach. p. 34. Retrieved 24 January 2025.
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