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C-type Nd(2)Se(3).

ABSTRACT: 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-) dodeca-hedra, 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.

SUBMITTER: Schneck C

PROVIDER: S-EPMC2968668 | biostudies-literature | 2009 Feb

REPOSITORIES: biostudies-literature

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C-type Nd(2)Se(3).

Schneck Christof C Höss Patrick P Schleid Thomas T

Acta crystallographica. Section E, Structure reports online 20090221 Pt 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, 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-) dodeca-hedra, wh ...[more]

PMID: 21582036

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