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:
Zeitschrift für anorganische und allgemeine Chemie
影响因子:
--
通讯作者:
Th. Doert
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

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采用化学气相输运法和碱金属卤化物助熔法制备了钆、铽和镝的多碲化物RETe 1.8单晶。为了确定所需目标组合物的适当合成条件,通过CalPhaD方法评估二元相图Gd-Te。这些化合物与SmTe 1.8同构,空间群为P4/n(no.85),GdTe 1.8,TbTe 1.8和DyTe 1.8的晶格参数分别为a = 966.10(4),960.00(3),957.33(2)pm和c = 1794.15(10),1785.77(6),1779.38(5)pm。根据ELI-D键合分析,该结构由起皱的[RETe]双层板和由Te 2哑铃和线性Te 3单元组成的平面碲化物层组成。后者可以理解为Te 34-阴离子。GdTe 1.8是一种半导体,带隙为0.19 eV/0.17 eV(实验/计算)。TbTe 1.8和DyTe 1.8在TN = 12 K和TN = 9.8K时的磁化强度数据证实了三价RE离子的存在,并表明反铁磁有序,而GdTe 1.8在2K时仍保持顺磁性。
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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