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- Title
The Gallides SrRh<sub>2</sub>Ga<sub>2</sub>, SrIr<sub>2</sub>Ga<sub>2</sub>, and Sr<sub>3</sub>Ir<sub>4</sub>Ga<sub>4</sub>.
- Authors
Seidel, Stefan; Schubert, Lea; Hoffmann, Rolf-Dieter; Pöttgen, Rainer
- Abstract
The gallides SrRh2Ga2, SrIr2Ga2, and Sr3Rh4Ga4 were obtained from the elements by induction melting and subsequent annealing. They were investigated by powder and single-crystal X-ray diffraction: CaRh2B2 type, Fddd, a = 573.2(1), b = 1051.3(1), c = 1343.7(2) pm, wR2 = 0.0218, 398 F2 values, 15 variables for SrRh2Ga2; a = 576.0(1), b = 1045.5(1), c = 1350.6(3) pm for SrIr2Ga2, and Na3Pt4Ge4 type, I $\bar{4}$3 m, a = 777.4(2) pm, wR2 = 0.0234, 190 F2 values, 11 variables for Sr3Ir4Ga4. The gallides SrRh2Ga2 and Sr3Ir4Ga4 exhibit complex, covalently bonded three-dimensional [Rh2Ga2] and [Ir4Ga4] networks with short Rh-Ga (241-246 pm) and Ir-Ga (243-259 pm) distances. The strontium atoms fill large cages within these networks. They are coordinated by 8 Rh + 10 Ga in SrRh2Ga2 and by 4 Ir + 8 Ga in Sr3Ir4Ga4. The structure of SrRh2Ga2 is discussed along with the monoclinic distortion variants HoNi2B2 and BaPt2Ga2 on the basis of a group-subgroup scheme.
- Subjects
INTERMETALLIC compounds; CRYSTAL structure; GALLIUM; X-ray diffraction; STRONTIUM
- Publication
Zeitschrift für Anorganische und Allgemeine Chemie, 2015, Vol 641, Issue 10, p1749
- ISSN
0044-2313
- Publication type
Article
- DOI
10.1002/zaac.201500221