Phase transitions of sulfur at high pressure: Influence of temperature and pressure environment

Rossmanith, Peter; Hafner, Wolfgang; Wokaun, Alexander; Olijnyk, H.

doi:10.1080/08957959308201645

Cited by 12 publications

(10 citation statements)

References 9 publications

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“…S1 ]. Since the strongest Raman features of elemental Sb 24 and S 25 26 27 do not reside in these frequencies, we can safely exclude any decomposition and attribute the appearance of the M1 and M2 features to a pressure-induced phase transition. The M2 feature was also detected in the study of Sorb et al .…”

Section: Resultsmentioning

confidence: 94%

Structural properties of Sb2S3 under pressure: evidence of an electronic topological transition

Efthimiopoulos

Buchan

Wang

2016

Sci Rep

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High-pressure Raman spectroscopy and x-ray diffraction of Sb2S3 up to 53 GPa reveals two phase transitions at 5 GPa and 15 GPa. The first transition is evidenced by noticeable compressibility changes in distinct Raman-active modes, in the lattice parameter axial ratios, the unit cell volume, as well as in specific interatomic bond lengths and bond angles. By taking into account relevant results from the literature, we assign these effects to a second-order isostructural transition arising from an electronic topological transition in Sb2S3 near 5 GPa. Close comparison between Sb2S3 and Sb2Se3 up to 10 GPa reveals a slightly diverse structural behavior for these two compounds after the isostructural transition pressure. This structural diversity appears to account for the different pressure-induced electronic behavior of Sb2S3 and Sb2Se3 up to 10 GPa, i.e. the absence of an insulator-metal transition in Sb2S3 up to that pressure. Finally, the second high-pressure modification appearing above 15 GPa appears to trigger a structural disorder at ~20 GPa; full decompression from 53 GPa leads to the recovery of an amorphous state.

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Section: Resultsmentioning

confidence: 94%

Structural properties of Sb2S3 under pressure: evidence of an electronic topological transition

Efthimiopoulos

Buchan

Wang

2016

Sci Rep

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“…However, the observed Raman spectra are similar to the spectra of the allotropes of molecular sulfur. Well separated groups of peaks around 600 cm-1 and 350 and 250 cm-1 at the highest pressures can be assigned to the stretching and bending modes of molecular units in a ring or some chain-type structure [11]. Interestingly, the Raman spectra persist to the highest pressures …”

Section: 'Ring' Cellmentioning

confidence: 88%

“…Previous works at pressures up to 40 GPa [11] showed a complicated picture. Raman spectra of sulfur and their pressure dependence are influenced by the hydrostatisity, the laser power, and photochemical reactions.…”

Section: 'Ring' Cellmentioning

confidence: 99%

High Pressure Methods at Low Temperatures and High Magnetic Fields.

Eremets

Amaya

Shimizu

et al. 1998

THE REVIEW OF HIGH PRESSURE SCIENCE AND TECHNOLOGY

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“…Among these allotropes, the most stable form of sulfur at ambient condition is S-I (or αS 8 ), which is a molecular crystal with crown shaped S 8 puckered rings . Sulfur has a complex phase diagram, consisting of several polymorphs whose stabilities and transformations strongly vary depending on various measurements reported. ,− Figure , for example, summarizes the phase diagram to 20 GPa, determined by the previous Raman studies. , According to this phase diagram, S-I transforms to amorphous sulfur ( a -S) above 3 GPa, which then transforms to trigonal S-II above 6 GPa. Above 10 GPa, S-II transforms to rhombohedral S-VI and further to tetragonal S-III with square-shaped chains above 12 GPa. , Upon further compression, S-III transforms to body centered orthorhombic (bco) S-IV at 83 GPa and further to rhombohedra S-V (β-Po) above 157 GPa, both of which become superconductors at low temperatures .…”

Section: Introductionmentioning

confidence: 99%

Reversible Photochemical Transformation of S and H₂ Mixture to (H₂S)₂H₂ at High Pressures

Duwal

Yoo

2017

J. Phys. Chem. C

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We report the reversible photochemical transformation of sulfur–hydrogen mixture to (H2S)2H2, which occurs through an expanded state of photoactive a-S phase of sulfur at 4 GPa. Upon further compression, the photoproduct (H2S)2H2 undergoes a phase transition at 17 GPa, and 40 GPa. The pressure-induced Raman changes indicate that the phase transition from phase I to II at 17 GPa is associated with the proton-ordering process in (H2S)2H2, evident by the profound splitting of S–H and H–H vibrational modes, whereas the transition at 40 GPa is accompanied by the disappearance of all the S–H stretching and bending modes and partial dissociation to sulfur. With increase in pressure, the molar volume of (H2S)2H2 is substantially larger than that of S + H2 mixtures, suggesting the significance of photochemical effect in order to drive the reaction from S + H2 to (H2S)2H2. In addition, we have also provided the thermal- and pressure-induced effect in the mixtures using confocal Raman spectroscopy. From our results, it is clear that the effect of pressure and photochemistry can be coupled to drive the reaction at room temperature and lower pressure, rather than having to drive the reaction thermally or mechanically, underscoring the significance of the photochemical effect in understanding the path-dependent transformations of sulfur and sulfur-containing materials.

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Phase transitions of sulfur at high pressure: Influence of temperature and pressure environment

Cited by 12 publications

References 9 publications

Structural properties of Sb2S3 under pressure: evidence of an electronic topological transition

Structural properties of Sb2S3 under pressure: evidence of an electronic topological transition

High Pressure Methods at Low Temperatures and High Magnetic Fields.

Reversible Photochemical Transformation of S and H₂ Mixture to (H₂S)₂H₂ at High Pressures

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Phase transitions of sulfur at high pressure: Influence of temperature and pressure environment

Cited by 12 publications

References 9 publications

Structural properties of Sb2S3 under pressure: evidence of an electronic topological transition

Structural properties of Sb2S3 under pressure: evidence of an electronic topological transition

High Pressure Methods at Low Temperatures and High Magnetic Fields.

Reversible Photochemical Transformation of S and H2 Mixture to (H2S)2H2 at High Pressures

Contact Info

Product

Resources

About

Reversible Photochemical Transformation of S and H₂ Mixture to (H₂S)₂H₂ at High Pressures