Vacancy Ordering Effects in AlB2-type ErGe2-x(0.4 < x < or = 0.5)

Christensen, JeppeStockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi (author)

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.

Lidin, SvenStockholms universitet,Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi(Swepub:su)lidin (author)
Malaman, Bernard (author)
Venturini, Gerard (author)
Stockholms universitetInstitutionen för fysikalisk kemi, oorganisk kemi och strukturkemi (creator_code:org_t)

By the author/editor: Christensen, Jep ...; Lidin, Sven; Malaman, Bernard; Venturini, Gerar ...

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