Structural Variations and Bonding Analysis of the Rare-Earth Metal Tellurides RETe1.875±δ (RE = Ce, Pr, Sm, Gd; 0.004 ≤ δ ≤ 0.025).

Structural Variations and Bonding Analysis of the Rare-Earth Metal Tellurides RETe1.875±δ (RE = Ce, Pr, Sm, Gd; 0.004 ≤ δ ≤ 0.025).
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稀土金属碲化物 RETe1 875±δ 的结构变化和成键分析 (RE = Ce, Pr, Sm, Gd; 0 004 ≤ δ ≤ 0 025)

DOI:
10.1021/acs.inorgchem.1c01230
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发表时间:
2021
影响因子:
4.6
通讯作者:
Th. Doert
Th. Doert
中科院分区:
化学2区
文献类型:
--
作者:
H. Poddig;P. Gebauer;K. Finzel;K. Stöwe;Th. Doert

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用碱金属卤化物助熔剂和化学输运反应生长了RETe 1.875 ±δ(RE= Ce,Pr,Sm,Gd; 0.004 ≤ δ ≤ 0.025)晶体。晶体结构在空间群Amm 2中描述(no.38),CeTe 1.87(1)的晶格参数为a = 13.3729(5),B= 17.7918(5),c= 18.1561(4)(T= 100 K),对于PrTe 1.85(1),a= 13.271(2)Ω,B= 17.747(3)Ω,c= 18.160(3)Ω(T= 100 K),对于SmTe 1.87(1),a= 13.1251(6)Ω,B= 17.4269(8)Ω,c= 17.8808(8)Ω(T= 100 K),anda= 13.1762(4)Ω,B= 17.4995(5)Ω,c= 17.9591(5)Ω.该结构包含褶皱[RETe]板和平面[Te]层的交替堆叠。后者是由小的阴离子实体,如Te 2-和Te 22-,沿着与一个大的阴离子八元Te环,支持基于电子局域化指标的键分析GdTe 1.875的有序模型。个别化合物的略微不同的模式表明相当大的结构灵活性。随温度变化的电阻测量证实了PrTe 1.875 ±δ和GdTe 1.875 ±δ的半导体行为(磁性数据证明了RE 3+和CeTe 1.875 ±δ在TN = 4 K和GdTe 1.875 ±δ在TN = 11 K时的反铁磁转变),而PrTe 1.875 ±δ和SmTe 1.875 ±δ在低至2 K时没有长程有序。
Crystals ofRETe1.875±δ(RE= Ce, Pr, Sm, Gd; 0.004 ≤ δ ≤ 0.025) were grown using alkali halide flux and chemical transport reactions. The crystal structures are described in space groupAmm2 (no. 38), with lattice parameters ofa= 13.3729(5) Å,b= 17.7918(5) Å,c= 18.1561(4) Å for CeTe1.87(1)(T= 100 K),a= 13.271(2) Å,b= 17.747(3) Å,c= 18.160(3) Å for PrTe1.85(1)(T= 100 K),a= 13.1251(6) Å,b= 17.4269(8) Å,c= 17.8808(8) Å for SmTe1.87(1)(T= 100 K), anda= 13.1762(4) Å,b= 17.4995(5) Å,c= 17.9591(5) Å for GdTe1.88(1)(T= 296 K). The structures contain alternating stacks of puckered [RETe] slabs and planar [Te] layers. The latter are composed of small anionic entities, such as Te2–and Te22–, along with a large anionic eight-membered Te ring, as supported by electron localizability indicator-based bond analysis for an ordered model of GdTe1.875. Slightly different patterns for individual compounds indicate a considerable structural flexibility. Temperature-dependent resistance measurements confirm semiconducting behavior for PrTe1.875±δand GdTe1.875±δ(magnetic data evidenceRE3+and an antiferromagnetic transition atTN= 4 K for CeTe1.875±δandTN= 11 K for GdTe1.875±δ), whereas PrTe1.875±δand SmTe1.875±δshow no long-range order down to 2 K.
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
发表时间: 2018
期刊: Zeitschrift für anorganische und allgemeine Chemie
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作者:
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