Samarium (III) sulfide

General
Surname	Samarium (III) sulfide
other names	Disamarium trisulfide; Samarium sesquisulfide;
Molecular formula	Sm 2 S 3
Brief description	gray-brown or red solid
External identifiers / databases
EC number	235-076-6
ECHA InfoCard	100,031,875
PubChem	166593
ChemSpider	145783
Wikidata	Q910589
properties
Molar mass	396.92 g mol −1
Physical state	firmly
density	5.87 g cm −3
Melting point	1720 ° C
safety instructions
GHS hazard labeling ; no classification available
GHS hazard labeling ; no classification available
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Samarium (III) sulfide is an inorganic chemical compound of samarium from the group of sulfides .

Extraction and presentation

Samarium (III) sulfide can be obtained by reacting samarium (III) oxide with hydrogen sulfide .

{\ displaystyle \ mathrm {Sm_ {2} O_ {3} +3 \ H_ {2} S \ longrightarrow Sm_ {2} S_ {3} +3 \ H_ {2} O}}

It is also possible to display it by converting elementary samarium with sulfur in an evacuated glass tube which is placed in a 2-zone furnace. The zone temperatures are 400 ° C and 100 ° C. After all the sulfur has reacted, the ampoule is tempered at 1000 ° C and the compound is obtained in polycrystalline form:

{\ displaystyle {\ ce {2 Sm + 3 S -> Sm2S3}}}

Rod-shaped single crystals up to 1 cm long can be obtained by modifying the synthesis from the elements. In addition to samarium and sulfur, elemental iodine is added to the ampoule to be evacuated. In the 2-zone furnace, the primary product is now produced . If the compound obtained is heated in the ampoule to 1100 to 1200 ° C and held there for at least 20 hours, the compound decomposes and samarium (III) sulfide single crystals grow in a melt of samarium (III) iodide . After opening the ampoule, adhering iodide to the single crystals can be rinsed off with water or a water-ethanol mixture: ${\ displaystyle {\ ce {SmSI}}}$

{\ displaystyle {\ ce {6 Sm + 6 S + 3 I2 -> 6 SmSI}}}

{\ displaystyle {\ ce {3 SmSI -> Sm2S3 + SmI3}}}

properties

Samarium (III) sulfide is a red or gray-brown solid. The compound occurs in two different crystal structures . An orthorhombic low-temperature form (isotype with gadolinium (III) sulfide ) and a high-temperature form with a cubic defect variant of the Th ₃ P ₄ type.

Individual evidence

↑ ^a ^b William M. Haynes (Ed.): CRC Handbook of Chemistry and Physics . 93rd edition. CRC Press, 2012, ISBN 978-1-4398-8049-4 , pp. 86 ( limited preview in Google Book search).
↑ ^a ^b ^c ^d ^e Dale L. Perry: Handbook of Inorganic Compounds . 2nd Edition. CRC Press, 2011, ISBN 978-1-4398-1462-8 , pp. 355 ( limited preview in Google Book Search).
↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
↑ G. Meyer, Lester R. Morss (Ed.): Synthesis of Lanthanide and Actinide Compounds . Springer, 1991, ISBN 0-7923-1018-7 , pp. 328 ( limited preview in Google Book search).
^ ^A ^b A. W. Sleight and DP Kelly: Rare-earth sesquisulfides, Ln ₂ S ₃ . In: Aaron Wold and John K. Ruff (Eds.): Inorganic Syntheses . tape 14 . McGraw-Hill Book Company, Inc., 1973, ISBN 07-071320-0 ( defective ) , p. 152-155 (English).
^ Christoph Janiak, Hans-Jürgen Meyer, Dietrich Gudat, Ralf Alsfasser: Riedel Modern Inorganic Chemistry . 4th edition. Walter de Gruyter, 2012, ISBN 978-3-11-024901-9 , p. 346 ( limited preview in Google Book search).

[William_M._Haynes-1] William M. Haynes (Ed.): CRC Handbook of Chemistry and Physics . 93rd edition. CRC Press, 2012, ISBN 978-1-4398-8049-4 , pp. 86 ( limited preview in Google Book search).

[Dale_L._Perry-2] Dale L. Perry: Handbook of Inorganic Compounds . 2nd Edition. CRC Press, 2011, ISBN 978-1-4398-1462-8 , pp. 355 ( limited preview in Google Book Search).

[NV-3] This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.

[G._Meyer,_Lester_R._Morss-4] G. Meyer, Lester R. Morss (Ed.): Synthesis of Lanthanide and Actinide Compounds . Springer, 1991, ISBN 0-7923-1018-7 , pp. 328 ( limited preview in Google Book search).

[IS14-5] A ^b A. W. Sleight and DP Kelly: Rare-earth sesquisulfides, Ln ₂ S ₃ . In: Aaron Wold and John K. Ruff (Eds.): Inorganic Syntheses . tape 14 . McGraw-Hill Book Company, Inc., 1973, ISBN 07-071320-0 ( defective ) , p. 152-155 (English).

[Christoph_Janiak,_Hans-Jürgen_Meyer,_Dietrich_Gudat,_Ralf_Alsfasser-6] Christoph Janiak, Hans-Jürgen Meyer, Dietrich Gudat, Ralf Alsfasser: Riedel Modern Inorganic Chemistry . 4th edition. Walter de Gruyter, 2012, ISBN 978-3-11-024901-9 , p. 346 ( limited preview in Google Book search).