Structure and compositional trends in alkali-metal containing titanium and vanadium oxide chalcogenides and the new van der Waals phase Ti2Te2O
Structure and compositional trends in alkali-metal containing titanium and vanadium oxide chalcogenides and the new van der Waals phase Ti2Te2O
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DOI：
10.1016/j.jssc.2023.124276
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发表时间：
2023-08-25
影响因子：
3.3
通讯作者：
Clarke，Simon J.
中科院分区：
文献类型：
--
作者：
Kelly，Nicola D.;Clarke，Simon J.
我们报告的所有18个层状氧化物硫族化合物的结构家族A M 2 Q 2 O（A= K/Rb/Cs; M= Ti/V; Q= S/Se/Te）的固态合成，允许确定的趋势在该系列内的组合物和反应性。所有材料都是同构的，在原始的四元晶系空间群P 4/m m m中结晶，如先前所报道的系列中的五种化合物。钛或钒离子在单一晶体位置上具有中间价态，导致与温度无关的顺磁性和受组成变化影响的相关电子行为。此外，图像1和图像2中的碱金属离子可以通过在室温下使用图像3进行氧化脱嵌来去除，以产生新的亚稳货车德瓦尔斯层状相，图像4。在脱嵌反应的氧化物硫族化物层经历了（0.5，0.5）在ab平面的相对位移，使图像4是体心与空间群I 4/m m m。
We report the solid-state synthesis of all eighteen layered oxide chalcogenides in the structural family A M 2 Q 2 O (A= K/Rb/Cs; M= Ti/V; Q= S/Se/Te), allowing the determination of trends in composition and reactivity within the series. All materials are isostructural, crystallising in the primitive tetragonal space group P 4/m m m as reported previously for five compounds in the series. The titanium or vanadium ions have intermediate valency on a single crystallographic site, leading to temperature-independent paramagnetism and correlated electronic behaviour which is influenced by the compositional variation. Furthermore, the alkali metal ions in Image 1 and Image 2 can be removed by oxidative deintercalation using Image 3 at room temperature to produce a new metastable van der Waals layered phase, Image 4. During the deintercalation reaction the oxide chalcogenide layers undergo a relative shift by (0.5, 0.5) in the ab plane such that Image 4 is body-centered with space group I 4/m m m.