Stable Sulfuric Vapor Transport and Liquid Sulfur Growth on Transition Metal Dichalcogenides
作者:Dmitriy A. Chareev、Md Ezaz Hasan Khan、Debjani Karmakar、Aleksey N. Nekrasov、Maximilian S. Nickolsky、Olle Eriksson、Anna Delin、Alexander N. Vasiliev、Mahmoud Abdel-Hafiez
DOI:10.1021/acs.cgd.2c01318
日期:——
Transitionmetal dichalcogenides (TMDs) are an emergent class of low-dimensional materials with growing applications in the field of nanoelectronics. However, efficient methods for synthesizing large monocrystals of these systems are still lacking. Here, we describe an efficient synthetic route for a large number of TMDs that were obtained in quartz glass ampoules by sulfuric vapor transport and liquid
Crystal Structures of the High‐Pressure Palladium Dichalcogenides Pd
<sub>0.94(1)</sub>
S
<sub>2</sub>
and Pd
<sub>0.88(1)</sub>
Se
<sub>2</sub>
Comprising Exceptional Pd
<sup>IV</sup>
Oxidation States
Metastable palladium deficient high‐pressure phases with the compositions Pd1–xS2 and Pd1–xSe2 could be obtained via high‐pressure/high‐temperature syntheses at 7.5 GPa (Pd0.88(1)Se2) and 11.5 GPa (Pd0.94(1)S2) at 1523 K. Compared to the normal‐pressure modifications they showed a significant decrease in the c‐lattice parameters of Δc/c = 4.4 % (Pd0.94(1)S2) and Δc/c = 10.8 % (Pd0.88(1)Se2) accompanied
可以通过在7.5 GPa(Pd 0.88(1) Se 2)和11.5 GPa的高压/高温合成获得组成为Pd 1– x S 2和Pd 1– x Se 2的亚稳钯不足高压相。(Pd 0.94(1) S 2)在1523K。与常压修改相比,它们的c晶格参数Δc / c = 4.4%(Pd 0.94(1) S 2)和Δ显着降低。c / c = 10.8%(Pd 0.88(1) Se 2),并伴有钯金占用不足的情况。单晶分析表明具有晶格参数的空间群Pbca和优化结果为a = 552.02(8),b = 555.11(8),c = 720.20(11)pm,R 1 = 0.0562,wR 2 = 0.0710(所有数据)对于Pd 0.94(1) S 2和a = 587.93(3),b = 593.16(4),c = 685.99(4)pm,R 1 = 0.0139,wR 2 = 0.0232(所有数据)对于Pd