Vacancy-ordering effects in AlB2-type ErGe2 - X (0.4 < x ≤ 0.5)
(2008) In Acta Crystallographica. Section B: Structural Science 64(3). p.272-280- Abstract
In the Er-Ge system, the compostion range ErGe2 to Er2Ge3 has been investigated. Eight samples were produced by arc melting of the elements, and analyzed using X-ray powder diffraction. Nine crystal structures were found to be present in the samples. The structures are described as a homologous series and presented within the superspace formalism using the superspace group X2/m(α0γ)0s, X representing the centring vector (1/2, 1/2, 0, 1/2). In this description the modulation vector q = (αa*+ γc*) is shown to be a direct measure of the Ge content as ErGe2 - α (α falls in the range 1/3 to 1/2). The large composition range is achieved by extended vacancy ordering in the planar 63 net of Ge with subsequent relaxation.
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https://lup.lub.lu.se/record/844d9e18-05db-466d-897e-c4f9e5902db4
- author
- Christensen, Jeppe LU ; Lidin, Sven LU ; Malaman, Bernard and Venturini, Gerard
- publishing date
- 2008-05-15
- type
- Contribution to journal
- publication status
- published
- keywords
- Modulation, Rare-earth germanides, Vacancy ordering
- in
- Acta Crystallographica. Section B: Structural Science
- volume
- 64
- issue
- 3
- pages
- 9 pages
- publisher
- International Union of Crystallography
- external identifiers
-
- scopus:44249109015
- ISSN
- 0108-7681
- DOI
- 10.1107/S0108768108005119
- language
- English
- LU publication?
- no
- id
- 844d9e18-05db-466d-897e-c4f9e5902db4
- date added to LUP
- 2019-04-08 15:12:06
- date last changed
- 2025-01-09 05:50:17
@article{844d9e18-05db-466d-897e-c4f9e5902db4, abstract = {{<p>In the Er-Ge system, the compostion range ErGe2 to Er2Ge3 has been investigated. Eight samples were produced by arc melting of the elements, and analyzed using X-ray powder diffraction. Nine crystal structures were found to be present in the samples. The structures are described as a homologous series and presented within the superspace formalism using the superspace group X2/m(α0γ)0s, X representing the centring vector (1/2, 1/2, 0, 1/2). In this description the modulation vector q = (αa*+ γc*) is shown to be a direct measure of the Ge content as ErGe2 - α (α falls in the range 1/3 to 1/2). The large composition range is achieved by extended vacancy ordering in the planar 6<sup>3</sup> net of Ge with subsequent relaxation.</p>}}, author = {{Christensen, Jeppe and Lidin, Sven and Malaman, Bernard and Venturini, Gerard}}, issn = {{0108-7681}}, keywords = {{Modulation; Rare-earth germanides; Vacancy ordering}}, language = {{eng}}, month = {{05}}, number = {{3}}, pages = {{272--280}}, publisher = {{International Union of Crystallography}}, series = {{Acta Crystallographica. Section B: Structural Science}}, title = {{Vacancy-ordering effects in AlB<sub>2</sub>-type ErGe<sub>2</sub> - X (0.4 < x ≤ 0.5)}}, url = {{http://dx.doi.org/10.1107/S0108768108005119}}, doi = {{10.1107/S0108768108005119}}, volume = {{64}}, year = {{2008}}, }