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Vacancy-ordering effects in AlB2-type ErGe2 - X (0.4 < x ≤ 0.5)

Christensen, Jeppe LU ; Lidin, Sven LU ; Malaman, Bernard and Venturini, Gerard (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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author
; ; and
publishing date
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}},
}