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Vacancy Ordering Effects in AlB2-type ErGe2-x(0.4 < x < or = 0.5)
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2008 (English)In: Acta Crystallographica Section B: Structural Science, ISSN 0108-7681, E-ISSN 1600-5740, Vol. 64, no 3, 272-280 p.Article in journal (Refereed) Published
Abstract [en]

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(0)0s, X representing the centring vector (½, ½, 0, ½). In this description the modulation vector q = (a* + c*) is shown to be a direct measure of the Ge content as ErGe2 -  ( falls in the range to ½). The large composition range is achieved by extended vacancy ordering in the planar 63 net of Ge with subsequent relaxation.

Place, publisher, year, edition, pages
2008. Vol. 64, no 3, 272-280 p.
Keyword [en]
modulation, rare-earth germanides, vacancy ordering.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:su:diva-24575DOI: 10.1107/S0108768108005119ISI: 000255902100002OAI: oai:DiVA.org:su-24575DiVA: diva2:197823
Available from: 2007-11-26 Created: 2007-11-26 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Non-Standard Crystallography: Examples in 3- and 3+1 Dimensional Space
Open this publication in new window or tab >>Non-Standard Crystallography: Examples in 3- and 3+1 Dimensional Space
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Crystallography today is by many seen as merely a tool for determining the structure of a material on the atomic level. It is expected that whatever comes out of the tool is the indisputable truth, a fact. This thesis is based on five publications illustrating that this is very far from the real world of materials research. The experiences drawn from the structural work in the papers are put together to illustrate when to be alert, and how to proceed with a structural investigation using non-standard crystallography. The focus is on interpreting the signs of additional order being present in a structure. The signs may be weak, such as extreme thermal vibration, or unit cell deformation. Or the signs can be strong, with superstructure reflections indicating the presence of either commensurate or incommensurate superstructures.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2007. 83 p.
Keyword
Modulation, Crystallography, intermetallic, materials
National Category
Chemical Sciences
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-7194 (URN)978-91-7155-524-3 (ISBN)
Public defence
2007-12-17, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-11-26 Created: 2007-11-26Bibliographically approved

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