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Crystals 2011, 1(3), 145-162; doi:10.3390/cryst1030145
Article

Ternary Compounds in the Sn-Rich Section of the Ba–Ga–Sn System: Ba8Ga16–xSn30+x (1.1 ≤ x ≤ 2.8) Clathrates of Type-I and Type-VIII, and BaGa2xSn4+x (x ≈ 0.2) with a Clathrate-like Structure

1, 1,2, 3 and 1,*
Received: 18 July 2011; in revised form: 8 August 2011 / Accepted: 12 August 2011 / Published: 17 August 2011
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Abstract: Systematic syntheses in the Ba–Ga–Sn system confirmed the existence of a new ternary phase BaGa1.79Sn4.21(2) (EuGa2Ge4 structure type; orthorhombic space group Cmcm, Pearson symbol oS28) with lattice parameters a = 4.5383(6) Å, b = 12.2486(16) Å, c = 14.3747(19) Å. The structure is best viewed as an open-framework based on tetrahedrally coordinated Sn/Ga atoms with Ba atoms enclosed in the voids within it. The new phase co-precipitates with two other compounds with very similar compositions—Ba8Ga14.5Sn31.5(4) (K4Si23 structure type; cubic space group , Pearson symbol cP54; a = 11.6800(12) Å), and Ba8Ga13.2Sn32.8(3), (Eu4Ga8Ge15 structure type; cubic space group , Pearson symbol cI54; a = 11.5843(7) Å). Detailed discussion on how syntheses affect the crystal chemistry, and the temperature dependence of the atomic displacement parameters, obtained from single-crystal structure refinements, are also reported in this article.
Keywords: clathrate type-I; clathrate type-VIII; barium; gallium; tin; crystal structure clathrate type-I; clathrate type-VIII; barium; gallium; tin; crystal structure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Schäfer, M.C.; Yamasaki, Y.; Fritsch, V.; Bobev, S. Ternary Compounds in the Sn-Rich Section of the Ba–Ga–Sn System: Ba8Ga16–xSn30+x (1.1 ≤ x ≤ 2.8) Clathrates of Type-I and Type-VIII, and BaGa2xSn4+x (x ≈ 0.2) with a Clathrate-like Structure. Crystals 2011, 1, 145-162.

AMA Style

Schäfer MC, Yamasaki Y, Fritsch V, Bobev S. Ternary Compounds in the Sn-Rich Section of the Ba–Ga–Sn System: Ba8Ga16–xSn30+x (1.1 ≤ x ≤ 2.8) Clathrates of Type-I and Type-VIII, and BaGa2xSn4+x (x ≈ 0.2) with a Clathrate-like Structure. Crystals. 2011; 1(3):145-162.

Chicago/Turabian Style

Schäfer, Marion C.; Yamasaki, Yuki; Fritsch, Veronika; Bobev, Svilen. 2011. "Ternary Compounds in the Sn-Rich Section of the Ba–Ga–Sn System: Ba8Ga16–xSn30+x (1.1 ≤ x ≤ 2.8) Clathrates of Type-I and Type-VIII, and BaGa2xSn4+x (x ≈ 0.2) with a Clathrate-like Structure." Crystals 1, no. 3: 145-162.


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