Effects of Rb Intercalation on NbSe2: Phase Formation, Structure, and Physical Properties,Inorganic Chemistry

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Effects of Rb Intercalation on NbSe2: Phase Formation, Structure, and Physical Properties
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2019-05-22 00:00:00 , DOI: 10.1021/acs.inorgchem.9b00862
Xiao Fan _{1,

2} , Hongxiang Chen _{1,

2} , Jun Deng _{1,

2} , Xiaoning Sun _{1,

2} , Linlin Zhao _{1,

2} , Long Chen _{1,

2} , Shifeng Jin _{1,

3} , Gang Wang _{1,

4} , Xiaolong Chen _{1,

3,

4}

Affiliation

Here, we report the crystal structures and properties of Rb_xNbSe₂, with 0 ≤ x ≤ 0.5. With Rb intercalation, Rb_xNbSe₂ evolves from 2H (Phase I) for 0 ≤ x ≤ 0.025, to 6R (Phase II) for x ∼ 0.2 with space group R3m (no. 166), and finally to 2H (Phase IV) for 0.375 ≤ x ≤ 0.5 with space group P6₃/mmc (no. 194). In addition, Phase II is found to transform to a rare 6H structure (Phase III) with space group P6₃/mmc (no. 194) by annealing at a relatively low temperature. We show the first 6H phase in the intercalated transition-metal dichalcogenides (TMDs) family obtained through a solid-state reaction. Moreover, both 6R and 6H phases are new polymorphs in the NbSe₂ system. For the range 0.2 ≤ x ≤ 0.5 in Rb_xNbSe₂, we show metallic electronic transport behavior and a paramagnetic feature. The lack of superconductivity (SC) down to 2 K is most probably due to the decrease of hole carrier density with increasing Rb content. Through careful analysis of the structural data, we were able to assemble a phase diagram covering the range of 0 ≤ x ≤ 0.5 in Rb_xNbSe₂.

中文翻译：

Rb插入对NbSe _2的影响：相形成，结构和物理性质

在这里，我们报告的晶体结构和Rb的特性_X NbSe ₂，其中0≤ X ≤0.5。与RB插层中，R b _X NbSe _2个演变从2H（第一阶段）为0≤ X ≤0.025，至6R（阶段II）为X〜0.2，空间群[R 3米（无166），最后到2H（相IV）为0.375≤ X ≤0.5，空间群P 6 ₃ / MMC（无194页）。此外，发现第二阶段转变为空间群为P 6 ₃ / mmc的稀有6H结构（第三阶段）（第194号）通过在较低温度下退火。我们显示了通过固态反应获得的插层过渡金属二卤化双金属（TMDs）家族中的第一个6H相。此外，在NbSe ₂系统中6R和6H相都是新的多晶型物。为0.2≤范围X ≤0.5 Rb中_X NbSe ₂，我们表明金属电子运输行为和顺磁特性。直至2 K的超导性（SC）的缺乏最可能是由于随着Rb含量的增加，空穴载流子密度的降低。穿过结构数据的仔细分析，我们能够组装覆盖的0≤的范围内的相图X ≤0.5 Rb中_X NbSe ₂。

更新日期：2019-05-22

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