Synthesis of technetium hydride TcH1.3 at 27 GPa
Di Zhou, Dmitrii V. Semenok, Mikhail A. Volkov, Ivan A. Troyan, Alexey Yu. Seregin, Ilya V. Chepkasov, Denis A. Sannikov, Pavlos G. Lagoudakis, Artem R. Oganov, Konstantin E. German
DOI 10.1103/PhysRevB.107.064102 · Physical Review B
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Abstract
In this work, we synthesize and investigate lower technetium hydrides at pressures up to 45 GPa using synchrotron x-ray diffraction, reflectance spectroscopy, and ab initio calculations. In the Tc-H system, the hydrogen content in TcHx phases increases when the pressure rises, and at 27 GPa we found a hexagonal (hcp) nonstoichiometric hydride TcH1.3. The formation of technetium hydrides is also confirmed by the emergence of a reflective band at 450–600 nm in the reflectance spectra of TcH1+x samples synthesized at 45 GPa. On the basis of theoretical analysis, we propose crystal structures for the phases TcH0.45±0.05 (Tc16H7) and TcH0.75±0.05 (Tc4H3) previously obtained at 1–2 GPa. Calculations of the electron-phonon interaction show that technetium hydrides TcH1+x (x=0–0.3) do not possess superconducting properties due to low electron-phonon interaction parameter (λ∼0.23).
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TcH1.3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 27 GPa | unknown |
| TcH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 30 GPa | unknown |
| Tc Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.73 | Pressure unresolved | unknown |
| TcH0.73 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | 1.9 GPa | unknown |
| LaH10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 250 | 150 GPa | unknown |
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