Author:
Fornasini M. L.,Cirafici S.
Abstract
Abstract
The crystal structures of five phases present in the Eu – Ga and Eu – In systems were determined by single crystal diffractometer methods. Eu3Ga2 (mS20) is monoclinic, C2/c, a = 8.680(2), b = 8.491(2), c = 8.658(2) Å, β = 108.59(2)°, Z = 4, R = 0.032 with 788 reflections. EuGa (aP8) is triclinic, P[unk], a = 5.878(2), b = 6.293(2), c = 6.546(2) Å, α = 68.00(2), β = 78.96(2), γ = 84.51(2)°, Z = 4,R = 0.039 with 779 reflections. Eu2In (oP12) is orthorhombic Co2Si-type, Pnma, a = 7.445(2), b = 5.573(1), c = 10.306(4) Å, Z = 4, R = 0.035 with 410 reflections. EuIn (tP4) is tetragonal AuCu-type, P4/mmm, a = 5.351(5), c = 4.288(3) Å, Z = 2. EuIn4 (mS20) is monoclinic, C2/m, a = 11.928(3), b = 5.099(1), c = 9.865(2) Å, β = 114.56(2)°, Z = 4, R = 0.035 with 608 reflections. The structures of Eu3Ga2, EuGa and EuIn4 are of a new type. The compound Eu3Ga2 replaces “Eu5Ga3“ in the corresponding phase diagram and its structure can be considered as a monoclinic distortion of the orthorhombic W2CoB2 type. The structure of EuGa is closely related to that of KHg; in both compounds deformed squares of Ga4 (or Hg4) atoms are present, isolated in EuGa and connected by loose Hg – Hg bonds in KHg. EuIn4 shows a two-layers structure, which can be described as intergrowth of deformed fragments of the three simple types BaAl4, AuCu3 and W.
Subject
Inorganic Chemistry,Condensed Matter Physics,General Materials Science
Cited by
33 articles.
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