Site occupancy wave and charge density wave in the modulated structure of Nd0.6Gd0.4Se1.85
(2004) In Journal of Solid State Chemistry 177(4-5). p.1598-1606- Abstract
Single crystals of Nd0.6Gd0.4Se1.85 have been prepared by chemical transport reactions starting from pre-annealed powder samples. Satellite reflections observed in X-ray and electron diffraction experiments indicate the presence of a two-dimensional lattice distortion. The origin of this is a site occupancy wave and, coupled to this, a charge density wave in the planar selenium layer of this compound. The modulated structure has been solved and refined from X-ray data using the superspace approach. Nd 0.6Gd0.4Se1.85 can be described in the (3+2)-dimensional superspace group P4/n(αβ12)(β-α12)00 with lattice parameters of a=4.088(1)Å, c=8.336(1)Å. Diffuse scattering... (More)
Single crystals of Nd0.6Gd0.4Se1.85 have been prepared by chemical transport reactions starting from pre-annealed powder samples. Satellite reflections observed in X-ray and electron diffraction experiments indicate the presence of a two-dimensional lattice distortion. The origin of this is a site occupancy wave and, coupled to this, a charge density wave in the planar selenium layer of this compound. The modulated structure has been solved and refined from X-ray data using the superspace approach. Nd 0.6Gd0.4Se1.85 can be described in the (3+2)-dimensional superspace group P4/n(αβ12)(β-α12)00 with lattice parameters of a=4.088(1)Å, c=8.336(1)Å. Diffuse scattering contributions have been observed around the satellite reflections which can be understood by the formation of domains with slightly different ordering patterns of Se atoms. Thus, the incommensurate translational parts of the modulation vectors are not constant over the whole crystal and can be described as α=0.29+k and β=0.29-k with -0.05≤k≤0.05.
(Less)
- author
- Doert, Thomas ; Fokwa Tsinde, Boniface Polequin ; Lidin, Sven LU and García, F. Javier García
- publishing date
- 2004-04-01
- type
- Contribution to journal
- publication status
- published
- keywords
- Charge density wave, Electron diffraction, Modulated structure, Rare-earth polyselenides, Site occupancy wave
- in
- Journal of Solid State Chemistry
- volume
- 177
- issue
- 4-5
- pages
- 9 pages
- publisher
- Elsevier
- external identifiers
-
- scopus:1642421789
- ISSN
- 0022-4596
- DOI
- 10.1016/j.jssc.2003.12.013
- language
- English
- LU publication?
- no
- id
- ba6262c0-bf5c-49da-af74-045f80c80d2b
- date added to LUP
- 2019-04-08 15:26:49
- date last changed
- 2022-01-31 18:51:57
@article{ba6262c0-bf5c-49da-af74-045f80c80d2b,
abstract = {{<p>Single crystals of Nd<sub>0.6</sub>Gd<sub>0.4</sub>Se<sub>1.85</sub> have been prepared by chemical transport reactions starting from pre-annealed powder samples. Satellite reflections observed in X-ray and electron diffraction experiments indicate the presence of a two-dimensional lattice distortion. The origin of this is a site occupancy wave and, coupled to this, a charge density wave in the planar selenium layer of this compound. The modulated structure has been solved and refined from X-ray data using the superspace approach. Nd <sub>0.6</sub>Gd<sub>0.4</sub>Se<sub>1.85</sub> can be described in the (3+2)-dimensional superspace group P4/n(αβ12)(β-α12)00 with lattice parameters of a=4.088(1)Å, c=8.336(1)Å. Diffuse scattering contributions have been observed around the satellite reflections which can be understood by the formation of domains with slightly different ordering patterns of Se atoms. Thus, the incommensurate translational parts of the modulation vectors are not constant over the whole crystal and can be described as α=0.29+k and β=0.29-k with -0.05≤k≤0.05.</p>}},
author = {{Doert, Thomas and Fokwa Tsinde, Boniface Polequin and Lidin, Sven and García, F. Javier García}},
issn = {{0022-4596}},
keywords = {{Charge density wave; Electron diffraction; Modulated structure; Rare-earth polyselenides; Site occupancy wave}},
language = {{eng}},
month = {{04}},
number = {{4-5}},
pages = {{1598--1606}},
publisher = {{Elsevier}},
series = {{Journal of Solid State Chemistry}},
title = {{Site occupancy wave and charge density wave in the modulated structure of Nd<sub>0.6</sub>Gd<sub>0.4</sub>Se<sub>1.85</sub>}},
url = {{http://dx.doi.org/10.1016/j.jssc.2003.12.013}},
doi = {{10.1016/j.jssc.2003.12.013}},
volume = {{177}},
year = {{2004}},
}