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High Pressure Investigation of the S-N-2 System up to the Megabar Range: Synthesis and Characterization of the SN2 Solid
Univ Bayreuth, Germany.
Univ Bayreuth, Germany.
Univ Bayreuth, Germany.
Natl Univ Sci and Technol MISIS, Russia.
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2019 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 58, no 14, p. 9195-9204Article in journal (Refereed) Published
Abstract [en]

Sulfur and nitrogen represent one of the most studied inorganic binary systems at ambient pressure on account of their large wealth of metastable exotic ring-like compounds. Under high pressure conditions, however, their behavior is unknown. Here, sulfur and nitrogen were compressed in a diamond anvil cell up to about 120 GPa and laser-heated at regular pressure intervals in an attempt to stabilize novel sulfur nitrogen compounds. Above 64 GPa, an orthorhombic (space group Pnnm) SN2 compound was synthesized and characterized by single-crystal and powder X-ray diffraction as well as Raman spectroscopy. It is shown to adopt a CaCl2-type structure hence it is isostructural, isomassic, and isoelectronic to CaCl2-type SiO2 comprised of SN6 octahedra. Complementary theoretical calculations were performed to provide further insight into the physicochemical properties of SN2, notably its equation of state, the bonding type between its constitutive elements, and its electronic density of states. This new solid is shown to be metastable down to about 20 GPa, after which it spontaneously decomposes into S and N-2. This investigation shows that despite the many metastable S N compounds existing at ambient conditions, none of them are formed by pressure.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2019. Vol. 58, no 14, p. 9195-9204
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-159727DOI: 10.1021/acs.inorgchem.9b00830ISI: 000475838000037PubMedID: 31247816OAI: oai:DiVA.org:liu-159727DiVA, id: diva2:1343872
Note

Funding Agencies|Alexander von Humboldt Foundation; Federal Ministry of Education and Research, Germany (BMBF) [5K16WC1]; Deutsche Forschungsgemeinschaft (DFG) [DU 954-11/1, DU 393-9/2, DU 393-13/1]; Russian Science Foundation [18-12-00492]; Swedish Research Council (VR) [2015-04391]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkoping University (Faculty Grant SFO-Mat-LiU) [2009-00971]

Available from: 2019-08-19 Created: 2019-08-19 Last updated: 2019-08-19

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