TY - JOUR
T1 - Synthesis and Crystal Structures of BaLaSi2 with cis-trans Si Chains and Ba5LaSi6 with Pentagonal Si Rings
AU - Hashimoto, Takayuki
AU - Yamane, Hisanori
AU - Yamada, Takahiro
AU - Sekiguchi, Takashi
PY - 2015/9/3
Y1 - 2015/9/3
N2 - Prismatic single crystals of novel compounds BaLaSi2 and Ba5LaSi6 were synthesized from the elements with or without a Na flux. The crystal structures of the compounds were analyzed by X-ray diffraction. BaLaSi2, containing cis-trans 1∞[Si] chains, crystallizes in an orthorhombic cell (a = 4.6414(2) Å, b = 14.8851(7) Å, c = 6.7519(5) Å; space group, Cmcm (No. 63), Z = 4) and is isotypic with the low-temperature phase of LaSi. The crystal structure of Ba5LaSi6 (a = 17.1447(5) Å, b = 4.8767(1) Å, and c = 17.9102(4) Å; space group Pnma (No. 62), Z = 4) is a new type containing isolated anionic groups (0[Si5-Si]) of a pentagonal Si ring with a Si-Si stem. The electrical resistivities measured for the polycrystalline BaLaSi2 and Ba5LaSi6 sintered samples were 0.31 and 0.48 mΩ·cm, respectively, at 300 K and increased with temperature. The Seebeck coefficients of BaLaSi2 and Ba5LaSi6 were -7.6 and -11 μV·K-1, respectively, at 296 K.
AB - Prismatic single crystals of novel compounds BaLaSi2 and Ba5LaSi6 were synthesized from the elements with or without a Na flux. The crystal structures of the compounds were analyzed by X-ray diffraction. BaLaSi2, containing cis-trans 1∞[Si] chains, crystallizes in an orthorhombic cell (a = 4.6414(2) Å, b = 14.8851(7) Å, c = 6.7519(5) Å; space group, Cmcm (No. 63), Z = 4) and is isotypic with the low-temperature phase of LaSi. The crystal structure of Ba5LaSi6 (a = 17.1447(5) Å, b = 4.8767(1) Å, and c = 17.9102(4) Å; space group Pnma (No. 62), Z = 4) is a new type containing isolated anionic groups (0[Si5-Si]) of a pentagonal Si ring with a Si-Si stem. The electrical resistivities measured for the polycrystalline BaLaSi2 and Ba5LaSi6 sintered samples were 0.31 and 0.48 mΩ·cm, respectively, at 300 K and increased with temperature. The Seebeck coefficients of BaLaSi2 and Ba5LaSi6 were -7.6 and -11 μV·K-1, respectively, at 296 K.
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U2 - 10.1021/acs.inorgchem.5b01604
DO - 10.1021/acs.inorgchem.5b01604
M3 - Article
AN - SCOPUS:84942096198
VL - 54
SP - 9188
EP - 9194
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 18
ER -