On the first incommensurate ordering of NH4Cu7-xS4
(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
- Norén, L. LU ; Berger, R. ; Lidin, S. LU ; Eriksson, L. LU ; Huster, J. and Petříček, V.
- publishing date
- 1999-06-29
- 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
- 2022-01-31 18:52:01
@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}}, doi = {{10.1016/S0925-8388(99)00009-2}}, volume = {{288}}, year = {{1999}}, }