Hydrogen intercalation of compounds with FeSe and MoS2 layered crystal structures

Бурханов, Г. С.; Лаченков, С. А.; Kononov, M. A.; Власенко, В. А.; Mikhaylova, A. B.; Korenovsky, N. L.

doi:10.1134/s2075113317050082

Cited by 10 publications

(3 citation statements)

References 4 publications

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“…al. have shown that hydrogen intercalation achieved using H plasma under vacuum environments leads to lattice expansion of MoS 2 similar to that from the 1H to 1T phase transition [35].…”

Section: Introductionmentioning

confidence: 88%

From a Co-Mo precursor to 1H and 1T Co-promoted MoS2: exploring the effects of gas pressure

Prabhu,

Groot

2023

Front. Phys.

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The work presented in this paper makes use of the high-pressure in situ imaging capabilities of the ReactorSTM to demonstrate that single layer 1T Co-promoted MoS2 can be directly synthesized without the use of any intercalating agents by applying highly reducing conditions during the growth. In this work, we have sulfided a CoMo nanoparticle precursor supported on Au(111) using a H2:CH3SH gas mixture at 1 bar and imaged the crystallization process in situ using the ReactorSTM. We have observed that at low temperatures (∼500 K), an intermediate disordered CoMoSx phase is formed which crystallizes into metallic single-layer 1T Co-promoted MoS2 slabs at temperatures close to 600 K. We also show that semiconducting 1H Co-promoted MoS2 slabs synthesized under sulfur-rich conditions using a vacuum physical vapor deposition process, do not transform into their metallic 1T counterparts when exposed to the same reducing gas pressures and temperatures, thus, demonstrating the importance of the highly reducing conditions during the crystallization process for inducing the formation of the metastable 1T phase. XPS spectra of the 1T Co-promoted MoS2 slabs indicate a sulfur deficiency of up to 11% in the top layer S, suggesting the likely role of sulfur vacancies in the formation of the 1T phase.

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“…al. have shown that hydrogen intercalation achieved using H plasma under vacuum environments leads to lattice expansion of MoS 2 similar to that from the 1H to 1T phase transition [35].…”

Section: Introductionmentioning

confidence: 88%

From a Co-Mo precursor to 1H and 1T Co-promoted MoS2: exploring the effects of gas pressure

Prabhu,

Groot

2023

Front. Phys.

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“…The bombardment of FeSe with hydrogen ions leads to an increase in the 3 sharpness of superconducting transition. 14 The electrochemical introduction of hydrogen ions caused enhancement of superconducting transition temperature c from 6 to 43.5 K for FeSe 0.93 S 0.07 and from 8.5 to 41 K for FeSe. 15 Annealing of the Fe-Te-Se compound in an oxygen atmosphere at temperatures of 300-400 °C leads to a strong changes in superconducting properties 16 and subsequent annealing of this compound in hydrogen causes an increase in the steepness of the superconducting transition.…”

Section: Introductionmentioning

confidence: 97%

The Effect of Hydrogenation on Structure and Superconducting Properties of FeTe0.65Se0.35 Single Crystals

Бондаренко

Prokhvatilov

Puźniak

et al. 2021

Preprint

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Single crystals of FeTe0.65Se0.35, with the onset of critical temperature (Tc) at 14 K, were hydrogenated for 10–90 hours at various temperatures, ranging from 20 to 250 oC. It is shown that tetragonal matrix becomes unstable and crystal symmetry is reduced for the crystals hydrogenated already at 200 oC despite that molecular impurities do not change matrix symmetry, unless the material is not destroyed under hydrogenation at 250 oC. Bulk Tc, takenat the middle of the transition, equal to about 12–13 K for the as-grown FeTe0.65Se0.35, increases by 1–2 K. The critical current density determined in magnetic field range of 0–70 kOe increases 4–30 times as a result of hydrogenation at 200 oC for 10 h. Electron paramagnetic resonance studies confirmed higher value of the bulk Tc for hydrogenated crystals. Thermal diffusion of hydrogen leads to substantial structural changes, causes degeneration of crystal quality, and significantly affects superconducting properties. A strong correlation was observed between the structural changes and changes in the parameters of the superconducting state for the hydrogenated crystals.

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“…It is well established now that the incorporation of hydrogen into iron chalcogenide superconductors (ICS), applying various methods, changes their superconducting state properties. The bombardment of FeSe with hydrogen ions leads to an increase in the sharpness of the superconducting transition [14]. The electrochemical introduction of hydrogen ions caused enhancement of superconducting transition temperature T c from 6 to 43.5 K for FeSe 0.93 S 0.07 and from 8.5 to 41 K for FeSe [15].…”

Section: Introductionmentioning

confidence: 99%

The Impact of Hydrogenation on Structural and Superconducting Properties of FeTe0.65Se0.35 Single Crystals

et al. 2021

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Properties of FeTe0.65Se0.35 single crystals, with the onset of critical temperature (Tconset) at 15.5 K, were modified via hydrogenation performed for 10–90 h, at temperatures ranging from 20 to 250 °C. It was found that the tetragonal matrix became unstable and crystal symmetry lowered for the samples hydrogenated already at 200 °C. However, matrix symmetry was not changed and the crystal was not destroyed after hydrogenation at 250 °C. Bulk Tcbulk, determined at the middle of the superconducting transition, which is equal to 12–13 K for the as grown FeTe0.65Se0.35, rose by more than 1 K after hydrogenation. The critical current density studied in magnetic field up to 70 kOe increased 4–30 times as a consequence of hydrogenation at 200 °C for 10 h. Electron paramagnetic resonance measurements also showed higher values of Tcbulk for hydrogenated crystals. Thermal diffusion of hydrogen into the crystals causes significant structural changes, leads to degeneration of crystal quality, and significantly alters superconducting properties. After hydrogenation, a strong correlation was noticed between the structural changes and changes in the parameters characterizing the superconducting state.

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Hydrogen intercalation of compounds with FeSe and MoS2 layered crystal structures

Cited by 10 publications

References 4 publications

From a Co-Mo precursor to 1H and 1T Co-promoted MoS2: exploring the effects of gas pressure

From a Co-Mo precursor to 1H and 1T Co-promoted MoS2: exploring the effects of gas pressure

The Effect of Hydrogenation on Structure and Superconducting Properties of FeTe0.65Se0.35 Single Crystals

The Impact of Hydrogenation on Structural and Superconducting Properties of FeTe0.65Se0.35 Single Crystals

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