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On the first incommensurate ordering of NH4Cu7-xS4

Norén, L. LU ; Berger, R.; Lidin, S. LU ; Eriksson, L. LU ; Huster, J. and Petříček, V. (1999) In Journal of Alloys and Compounds 288(1-2). p.102-109
Abstract

The first incommensurate ordering of NH4Cu7-xS4 (x = 0.16) has been investigated using X-ray single crystal diffraction at 174 K. The modulated structure is described with monoclinic symmetry with the cell parameters a = 10.272 (angstrom), b = 10.272 (angstrom), c = 7.694 (angstrom) and β=90.0°. It belongs to the four-dimensional space group P:P2/n:-11 {conventional setting P:P2/b:-11 (no. 13.1)}. The incommensurate modulation to the lattice (q approx. 0.39, 0, 0) appears to be caused by the sub-stoichiometry of copper. A DSC-study of the isostructural TlCu7-xS4 relates the thermal behaviour of the two thiocuprates to changes in the copper content. A tentative 'phase stability... (More)

The first incommensurate ordering of NH4Cu7-xS4 (x = 0.16) has been investigated using X-ray single crystal diffraction at 174 K. The modulated structure is described with monoclinic symmetry with the cell parameters a = 10.272 (angstrom), b = 10.272 (angstrom), c = 7.694 (angstrom) and β=90.0°. It belongs to the four-dimensional space group P:P2/n:-11 {conventional setting P:P2/b:-11 (no. 13.1)}. The incommensurate modulation to the lattice (q approx. 0.39, 0, 0) appears to be caused by the sub-stoichiometry of copper. A DSC-study of the isostructural TlCu7-xS4 relates the thermal behaviour of the two thiocuprates to changes in the copper content. A tentative 'phase stability diagram' for such compounds is presented.

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author
publishing date
type
Contribution to journal
publication status
published
in
Journal of Alloys and Compounds
volume
288
issue
1-2
pages
8 pages
publisher
Elsevier
external identifiers
  • scopus:0032672730
ISSN
0925-8388
DOI
10.1016/S0925-8388(99)00009-2
language
English
LU publication?
no
id
6b29c5c6-2207-44c7-b7d0-26949e178691
date added to LUP
2019-04-08 16:05:20
date last changed
2019-06-27 23:06:59
@article{6b29c5c6-2207-44c7-b7d0-26949e178691,
  abstract     = {<p>The first incommensurate ordering of NH<sub>4</sub>Cu<sub>7-x</sub>S<sub>4</sub> (x = 0.16) has been investigated using X-ray single crystal diffraction at 174 K. The modulated structure is described with monoclinic symmetry with the cell parameters a = 10.272 (angstrom), b = 10.272 (angstrom), c = 7.694 (angstrom) and β=90.0°. It belongs to the four-dimensional space group P:P2/n:-11 {conventional setting P:P2/b:-11 (no. 13.1)}. The incommensurate modulation to the lattice (q approx. 0.39, 0, 0) appears to be caused by the sub-stoichiometry of copper. A DSC-study of the isostructural TlCu<sub>7-x</sub>S<sub>4</sub> relates the thermal behaviour of the two thiocuprates to changes in the copper content. A tentative 'phase stability diagram' for such compounds is presented.</p>},
  author       = {Norén, L. and Berger, R. and Lidin, S. and Eriksson, L. and Huster, J. and Petříček, V.},
  issn         = {0925-8388},
  language     = {eng},
  month        = {06},
  number       = {1-2},
  pages        = {102--109},
  publisher    = {Elsevier},
  series       = {Journal of Alloys and Compounds},
  title        = {On the first incommensurate ordering of NH<sub>4</sub>Cu<sub>7-x</sub>S<sub>4</sub>},
  url          = {http://dx.doi.org/10.1016/S0925-8388(99)00009-2},
  volume       = {288},
  year         = {1999},
}