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MgAuGa and MgAu2Ga: first representatives of the Mg-Au-Ga system

TitleMgAuGa and MgAu2Ga: first representatives of the Mg-Au-Ga system
Publication TypeJournal Article
Year of Publication2014
AuthorsSmetana, V, Corbett, JD, Miller, GJ
JournalActa Crystallographica Section C-Structural Chemistry
Date Published04
Type of ArticleArticle
ISBN Number0108-2701
Accession NumberWOS:000334050600003
KeywordsCrystal structure, Fe2P structure type, gold-gallium, hexagonal Na3As structure type, Mg-Au-Ga system, MgAu2Ga, MgAuGa, ternary phase

major element with the missing element. In fact, the structure of MgAuGa closely resembles hexagonal Mg2Ga through a direct group-subgroup relationship. MgAu2Ga (magnesium digold gallium) also crystallizes hexagonally in the space group P6(3)/mmc and is isotypic with Na3As. It adopts the structure of another binary compound, viz. Mg3Au (hP8), but shows an unexpected distribution of Mg, Au, and Ga among the atomic positions of the asymmetric unit. Both MgAuGa and MgAu2Ga can be described as formally anionic Au/Ga frameworks, with pseudo-hexagonal tunnels around Mg in MgAuGa or cages in MgAu2Ga.

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