Vacancy Ordering Effects in AlB2-type ErGe2-x(0.4 < x < or = 0.5)
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
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.
modulation, rare-earth germanides, vacancy ordering.
IdentifiersURN: urn:nbn:se:su:diva-24575DOI: 10.1107/S0108768108005119ISI: 000255902100002OAI: oai:DiVA.org:su-24575DiVA: diva2:197823