Synthesis, Structure, and Properties of BaAl2Si2
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- 作者：Cathie L. Condron ; Hå ; kon Hope ; Paula M. B. Piccoli ; Arthur J. Schultz ; Susan M. Kauzlarich
- 刊名：Inorganic Chemistry
- 出版年：2007
- 出版时间：May 28, 2007
- 年：2007
- 卷：46
- 期：11
- 页码：4523 - 4529
- 全文大小：185K
- 年卷期：v.46,no.11(May 28, 2007)
- ISSN：1520-510X
文摘
Single crystals of BaAl2Si2 were grown from an Al molten flux and characterized using single-crystal X-ray diffractionat 10 and 90 K and neutron diffraction at room temperature. BaAl2Si2 crystallizes with the 
-BaCu2S2 structuretype (Pnma), is isostructural with -BaAl2Ge2, and is an open 3D framework compound, where Al and Si form acovalent cagelike network with Ba2+ cations residing in the cages. BaAl2Si2 has a unit cell of a = 10.070(3) Å, b= 4.234(1) Å, and c = 10.866(3) Å, as determined by room-temperature single-crystal neutron diffraction (R1 =0.0533, wR2 = 0.1034). The structure as determined by single-crystal neutron and X-ray diffraction (10 and 90 K)indicates that BaAl2Si2 (Pnma) is strictly isostructural to other ()-BaCu2S2-type structures, requiring site specificityfor Al and Si. Unlike BaAl2Ge2, no evidence for an to 
(BaZn2P2-type, I4/mmm) phase transition was observed.This compound shows metallic electronic resistivity and Pauli paramagnetic behavior.
-BaCu2S2 structuretype (Pnma), is isostructural with -BaAl2Ge2, and is an open 3D framework compound, where Al and Si form acovalent cagelike network with Ba2+ cations residing in the cages. BaAl2Si2 has a unit cell of a = 10.070(3) Å, b= 4.234(1) Å, and c = 10.866(3) Å, as determined by room-temperature single-crystal neutron diffraction (R1 =0.0533, wR2 = 0.1034). The structure as determined by single-crystal neutron and X-ray diffraction (10 and 90 K)indicates that BaAl2Si2 (Pnma) is strictly isostructural to other ()-BaCu2S2-type structures, requiring site specificityfor Al and Si. Unlike BaAl2Ge2, no evidence for an to (BaZn2P2-type, I4/mmm) phase transition was observed.This compound shows metallic electronic resistivity and Pauli paramagnetic behavior.