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Are photo-induced crystalline sulfur and S-II equivalent under high pressure?

[Display omitted] •The synchrotron XRD pattern of p-S was successfully obtained for the first time.•Confirmation of the structural consistency between the p-S and the S-II phases.•The fibrous S phase is also the back-transformation product of the S-II phase, which further confirms that p-S and S-II...

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Published in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2022-09, Vol.430, p.113964, Article 113964
Main Authors: Chen, Long, Shi, Kaiyuan, Su, Lei, Wang, Shuangqing, Yang, Guoqiang
Format: Article
Language:English
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Summary:[Display omitted] •The synchrotron XRD pattern of p-S was successfully obtained for the first time.•Confirmation of the structural consistency between the p-S and the S-II phases.•The fibrous S phase is also the back-transformation product of the S-II phase, which further confirms that p-S and S-II are the same phase. Sulfur is known to be a photo-sensitive material. Photo-induced crystalline sulfur (p-S) was found in high-pressure Raman studies more than two decades ago. However, its structureremains not well understood. In this work, a thin α-S8 crystal was pressurized to 8 GPa in a diamond anvil cell (DAC) and its surface was repeatedly scanned by a 532 nm laser to produce the largest possible amount of p-S. A high-quality XRD pattern of p-S was obtained for the first time. The refinement of experimental data indicated the structural consistency between p-S and high-pressure and high-temperature (HPHT) S-II phases. Moreover, HPHT experiments were conducted to study the effect of temperature on p-S formation. The current work provides a strategy for producing the high-purity photo-induced product. The combination of synchrotron XRD, Raman spectroscopy, and microscopical imaging technology shows an effective way for photochemical research.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2022.113964