Rare Earth Metal PolytelluridesRETe1.8(RE= Gd, Tb, Dy) - Directed Synthesis, Crystal and Electronic Structures, and Bonding Features
Rare Earth Metal PolytelluridesRETe1.8(RE= Gd, Tb, Dy) - Directed Synthesis, Crystal and Electronic Structures, and Bonding Features
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稀土金属聚碲化物RETe1 8(RE= Gd, Tb, Dy) - 定向合成、晶体和电子结构以及键合特性
DOI:
10.1002/zaac.201800382
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发表时间:
2018
期刊:
影响因子:
--
通讯作者:
Th. Doert
中科院分区:
文献类型:
--
作者:
H. Poddig;T. Donath;P. Gebauer;K. Finzel;M. Kohout;P. Schmidt;Th. Doert
Single crystals of the polytelluridesRETe1.8of gadolinium, terbium, and dysprosium were prepared by chemical vapor transport and alkali metal halide flux reactions. To determine proper synthesis conditions for the desired target composition, the binary phase diagram Gd‐Te was evaluated by CalPhaD methods. The compounds are isostructural to SmTe1.8and crystallize in space groupP4/n(no. 85) with lattice parameters ofa= 966.10(4), 960.00(3), and 957.33(2) pm andc= 1794.15(10), 1785.77(6), and 1779.38(5) pm for GdTe1.8, TbTe1.8and DyTe1.8, respectively. The structures consist of puckered [RETe] double slabs and planar telluride layers composed of Te2dumbbells and linear Te3units in accordance with ELI‐D based bonding analyses. The latter can be understood as a Te34–anion. GdTe1.8is a semiconductor with a bandgap of 0.19 eV/0.17 eV (experimental/calculated). Magnetization data confirm trivalentREions and indicate antiferromagnetic order atTN= 12 K for TbTe1.8andTN= 9.8 K for DyTe1.8, whereas GdTe1.8remains paramagnetic down to 2 K.
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影响因子:
3.5
作者:
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DOI:
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1989
期刊:
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DOI:
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2007
期刊:
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DOI:
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2007
期刊:
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