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Chemical compound From Wikipedia, the free encyclopedia
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.
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Other names
disamarium trisulphide; Samarium sesquisulfide | |
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3D model (JSmol) |
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ChemSpider | |
ECHA InfoCard | 100.031.875 |
EC Number |
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PubChem CID |
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CompTox Dashboard (EPA) |
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Properties | |
Sm2S3 | |
Molar mass | 396.915 g/mol |
Appearance | red-brown crystals |
Density | 5.87 g/cm3, solid |
Melting point | 1,720 °C (3,130 °F; 1,990 K) |
Band gap | 1.71 eV |
+3300.0·10−6 cm3/mol | |
Structure | |
orthorhombic | |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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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]
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 samarium sulfides include the monosulfide SmS and the mixed valent Sm3S4 which are also semiconductors.[5] KSm2CuS6 is a layered quaternary sulfide.[6]
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