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C-type Nd(2)Se(3)
The title compound, neodymium sesquiselenide, is isotypic with the other known rare-earth metal(III) selenides M (2)Se(3) (M = La–Pr and Sm–Lu) with the cubic C-type structure. It adopts a cation-defective Th(3)P(4)-type arrangement with close to 8/9 of the unique neodymium-cation site occupied, lea...
Autores principales: | , , |
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Formato: | Texto |
Lenguaje: | English |
Publicado: |
International Union of Crystallography
2009
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2968668/ https://www.ncbi.nlm.nih.gov/pubmed/21582036 http://dx.doi.org/10.1107/S1600536809005455 |
Sumario: | The title compound, neodymium sesquiselenide, is isotypic with the other known rare-earth metal(III) selenides M (2)Se(3) (M = La–Pr and Sm–Lu) with the cubic C-type structure. It adopts a cation-defective Th(3)P(4)-type arrangement with close to 8/9 of the unique neodymium-cation site occupied, leading to the composition Nd(2.667)Se(4) (Z = 4) or Nd(2)Se(3) (Z = 5.333), respectively. The Nd(3+) cations are thus surrounded by eight selenide anions, forming trigonal [NdSe(8)](13−) dodecahedra, whereas the Se(2−) anions exhibit a sixfold coordination, but due to the under-occupation of neodymium, each one is statistically surrounded by only 5.333 cations. The crystal studied was a merohedral twin with a 0.31 (6):0.69 (6) domain ratio. |
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