Samarium(III) sulfide explained

Samarium(III) sulfide (Sm2S3) is a chemical compound of the rare earth element samarium, and sulfur. In this compound samarium is in the +3 oxidation state, and sulfur is an anion in the −2 state.

Production

One way to make Samarium(III) sulfide is to heat samarium metal with sulfur. Another way to make a thin film is to alternatively soak in samarium(III) chloride tartaric acid complex, and sodium thiosulfate.[1]

Properties

The low temperature α form crystallises in the orthorhombic crystal system. The unit cell has dimensions a=7.376, b=3.9622 c=15.352 Å with volume 448.7 Å3. There are four of the formula in each unit cell (Sm8S12). The density comes out to 5.88 kg/liter. There are two kinds of samarium coordination in the solid, one is eight coordinated with sulfur surrounding in a bicapped trigonal pyramid. The other is a sevenfold capped distorted octahedral arrangement. This structure is similar to other light rare-earth element sulfides.[2]

Samarium(III) sulfide is a semiconductor with a band gap of 1.7 eV.[3] As a thin film on high area electrodes, it is under investigation as a super capacitor dielectric, with specific capacitances of up to 360 Farads per gram.[4]

Related

Related samarium sulfides include the monosulfide SmS and the mixed valent Sm3S4 which are also semiconductors.[5] KSm2CuS6 is a layered quaternary sulfide.[6]

Notes and References

  1. Kumbhar . V.S. . Jagadale . A.D. . Lokhande . C.D. . Supercapacitive evaluation of soft chemically deposited α-Sm2S3 thin films . Journal of Power Sources . July 2013 . 234 . 107–110 . 10.1016/j.jpowsour.2013.01.078.
  2. Aruga . Atsushi . Tsujimi . Sachiko . Nakai . Izumi . Crystal Structure of Samarium Sesquisulfide, α-Sm2S3. . Analytical Sciences . 1996 . 12 . 1 . 151–152 . 10.2116/analsci.12.151. free .
  3. Marin . Chris M. . Wang . Lu . Brewer . Joseph R. . Mei . Wai-Ning . Cheung . Chin Li . Crystalline α-Sm2S3 nanowires: Structure and optical properties of an unusual intrinsically degenerate semiconductor . Journal of Alloys and Compounds . June 2013 . 563 . 293–299 . 10.1016/j.jallcom.2013.02.082.
  4. Ghogare . T.T. . Lokhande . V.C. . Ji . T. . Patil . U.M. . Lokhande . C.D. . A graphene oxide /samarium sulfide (GO/Sm2S3) composite thin film: Preparation and electrochemical study . Surfaces and Interfaces . June 2020 . 19 . 100507 . 10.1016/j.surfin.2020.100507. 216370577 .
  5. Wang . Lu . Marin . Chris . Mei . Wai-Ning . Cheung . Chin . Electronic structures of lanthanum, samarium, and gadolinium sulfides . AIMS Materials Science . 97–105 . 31 May 2015. 2 . 2 . 10.3934/matersci.2015.2.97 . free .
  6. Pomelova. Tatiana A.. Podlipskaya. Tatiana Yu.. Kuratieva. Natalia V.. Cherkov. Alexander G.. Nebogatikova. Nadezhda A.. Ryzhikov. Maxim R.. Huguenot. Arthur. Gautier. Régis. Naumov. Nikolay G.. 2018-11-05. Synthesis, Crystal Structure, and Liquid Exfoliation of Layered Lanthanide Sulfides KLn 2 CuS 6 (Ln = La, Ce, Pr, Nd, Sm). Inorganic Chemistry. en. 57. 21. 13594–13605. 10.1021/acs.inorgchem.8b02213. 30354089. 53026735 . 0020-1669.

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