The crystal structures of Co3Se4 and Co 7Se8

F. Javier García-García; Ann Kristin Larsson; Lasse Norèn; Ray L. Withers

doi:10.1016/j.solidstatesciences.2004.03.030

The crystal structures of Co₃Se₄ and Co ₇Se₈

F. Javier García-García, Ann Kristin Larsson^*, Lasse Norèn, Ray L. Withers

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

The crystal structures of Co₃Se₄ and Co _6.8Se₈ have been refined from twinned single crystal and powder X-ray diffraction data. The refined structures are isostructural to the Cr_3±xSe₄ and Cr₇Se₈ types, respectively. The structures are described as superstructures of the Cd(OH) ₂-type structure, where the empty layers of unoccupied octahedra are replaced with alternating Co filled and empty [100] rods and Co filled Kagomè nets for Co₃Se₄ and Co_6.8Se ₈, respectively. The structure of Co₃Se₄ is not a substructure of Co₇Se₈ and the path from Co ₇Se₈ to Co₃Se₄ by removing 1/4 of the Co atoms in the Kagomè nets involves both gain and loss of symmetry. Yet the refinements of Co_6.8Se₈ suggest an extended homogeneity field.

Original language	English
Pages (from-to)	725-733
Number of pages	9
Journal	Solid State Sciences
Volume	6
Issue number	7
DOIs	https://doi.org/10.1016/j.solidstatesciences.2004.03.030
Publication status	Published - Jul 2004

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10.1016/j.solidstatesciences.2004.03.030

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title = "The crystal structures of Co3Se4 and Co 7Se8",

abstract = "The crystal structures of Co3Se4 and Co 6.8Se8 have been refined from twinned single crystal and powder X-ray diffraction data. The refined structures are isostructural to the Cr3±xSe4 and Cr7Se8 types, respectively. The structures are described as superstructures of the Cd(OH) 2-type structure, where the empty layers of unoccupied octahedra are replaced with alternating Co filled and empty [100] rods and Co filled Kagom{\`e} nets for Co3Se4 and Co6.8Se 8, respectively. The structure of Co3Se4 is not a substructure of Co7Se8 and the path from Co 7Se8 to Co3Se4 by removing 1/4 of the Co atoms in the Kagom{\`e} nets involves both gain and loss of symmetry. Yet the refinements of Co6.8Se8 suggest an extended homogeneity field.",

keywords = "Co-Se system, Crystal structure, Single crystal refinements, Superstructure, Twin, X-ray powder refinements",

author = "Garc{\'i}a-Garc{\'i}a, {F. Javier} and Larsson, {Ann Kristin} and Lasse Nor{\`e}n and Withers, {Ray L.}",

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T1 - The crystal structures of Co3Se4 and Co 7Se8

AU - García-García, F. Javier

AU - Larsson, Ann Kristin

AU - Norèn, Lasse

AU - Withers, Ray L.

PY - 2004/7

Y1 - 2004/7

N2 - The crystal structures of Co3Se4 and Co 6.8Se8 have been refined from twinned single crystal and powder X-ray diffraction data. The refined structures are isostructural to the Cr3±xSe4 and Cr7Se8 types, respectively. The structures are described as superstructures of the Cd(OH) 2-type structure, where the empty layers of unoccupied octahedra are replaced with alternating Co filled and empty [100] rods and Co filled Kagomè nets for Co3Se4 and Co6.8Se 8, respectively. The structure of Co3Se4 is not a substructure of Co7Se8 and the path from Co 7Se8 to Co3Se4 by removing 1/4 of the Co atoms in the Kagomè nets involves both gain and loss of symmetry. Yet the refinements of Co6.8Se8 suggest an extended homogeneity field.

AB - The crystal structures of Co3Se4 and Co 6.8Se8 have been refined from twinned single crystal and powder X-ray diffraction data. The refined structures are isostructural to the Cr3±xSe4 and Cr7Se8 types, respectively. The structures are described as superstructures of the Cd(OH) 2-type structure, where the empty layers of unoccupied octahedra are replaced with alternating Co filled and empty [100] rods and Co filled Kagomè nets for Co3Se4 and Co6.8Se 8, respectively. The structure of Co3Se4 is not a substructure of Co7Se8 and the path from Co 7Se8 to Co3Se4 by removing 1/4 of the Co atoms in the Kagomè nets involves both gain and loss of symmetry. Yet the refinements of Co6.8Se8 suggest an extended homogeneity field.

KW - Co-Se system

KW - Crystal structure

KW - Single crystal refinements

KW - Superstructure

KW - Twin

KW - X-ray powder refinements

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U2 - 10.1016/j.solidstatesciences.2004.03.030

DO - 10.1016/j.solidstatesciences.2004.03.030

M3 - Article

SN - 1293-2558

VL - 6

SP - 725

EP - 733

JO - Solid State Sciences

JF - Solid State Sciences

IS - 7

ER -

The crystal structures of Co₃Se₄ and Co ₇Se₈

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