Pressure-induced phase transition, metallization, and superconductivity in boron triiodide
Nozomu Hamaya, Miyuki Ishizuka, Suzue Onoda, Jiang Guishan, Ayako Ohmura, Katsuya Shimizu
DOI 10.1103/PhysRevB.82.094506 · Physical Review B
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Abstract
Pressure evolution of structural and electrical properties of boron triiodide, a highly anisotropic molecular crystal consisting of stacked layers of planar BI3 molecules, has been studied by x-ray diffraction and resistivity measurements. A new phase transition was observed to occur at 6.2 GPa from the molecular phase with hexagonal structure to a monatomic phase with the face-centered-cubic lattice of iodine atoms. This first-order phase transition is characterized by the discontinuous crush of stacking of molecular layers. The monatomic phase becomes metallic at ∼23 GPa and exhibits superconductivity above ∼27 GPa. The process of molecular dissociation and electrical properties of BI3 are discussed in comparison with those of iodine and other simple molecular iodides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BI3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 27 GPa | unknown |
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