RE2MAl6Si4 (RE = Gd, Tb, Dy; M = Au, Pt): Layered Quaternary Intermetallics Featuring CaAl2Si2-Type and YNiAl4Ge2-Type Slab
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- 作者：Susan E. Latturner ; Daniel Bilc ; S. D. Mahanti ; and Mercouri G. Kanatzidis
- 刊名：Inorganic Chemistry
- 出版年：2003
- 出版时间：December 1, 2003
- 年：2003
- 卷：42
- 期：24
- 页码：7959 - 7966
- 全文大小：288K
- 年卷期：v.42,no.24(December 1, 2003)
- ISSN：1520-510X
文摘
Six new intermetallic aluminum silicides-Gd2PtAl6Si4, Gd2AuAl6Si4, Tb2PtAl6Si4, Tb2AuAl6Si4, Dy2PtAl6Si4, and Dy2AuAl6Si4-have been obtained from reactions carried out in aluminum flux. The structure of these compounds wasdetermined by single-crystal X-ray diffraction. They form in space group R
m with cell constants of a = 4.1623(3)Å and c = 51.048(5) Å for the Gd2PtAl6Si4 compound. The crystal structure is comprised of hexagonal nets of rareearth atoms alternating with two kinds of layers that have been observed in other multinary aluminide intermetalliccompounds (CaAl2Si2 and YNiAl4Ge2). All six RE2MAl6Si4 compounds show antiferromagnetic transitions at lowtemperatures (TN < 20 K); magnetization studies of the Dy compounds show metamagnetic behavior with reorientationof spins at 6000 G. Band structure calculations indicate that the AlSi puckered hexagonal sheets in this structureare electronically distinct from the other surrounding structural motifs.
m with cell constants of a = 4.1623(3)Å and c = 51.048(5) Å for the Gd2PtAl6Si4 compound. The crystal structure is comprised of hexagonal nets of rareearth atoms alternating with two kinds of layers that have been observed in other multinary aluminide intermetalliccompounds (CaAl2Si2 and YNiAl4Ge2). All six RE2MAl6Si4 compounds show antiferromagnetic transitions at lowtemperatures (TN < 20 K); magnetization studies of the Dy compounds show metamagnetic behavior with reorientationof spins at 6000 G. Band structure calculations indicate that the AlSi puckered hexagonal sheets in this structureare electronically distinct from the other surrounding structural motifs.