Heavy alkali metal-arsenic alloy-based graphite intercalation compounds: Investigation of their synthesis and of their physical properties
| Autor: | Latifa Hajji, Philippe Lagrange, Jamal Assouik, Mohammed Chaouqi, Abdellatif Boukir |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
General Chemical Engineering Intercalation (chemistry) Alloy Inorganic chemistry Analytical chemistry chemistry.chemical_element 02 engineering and technology General Chemistry engineering.material 021001 nanoscience & nanotechnology Alkali metal 01 natural sciences Magnetic susceptibility symbols.namesake chemistry Electrical resistivity and conductivity 0103 physical sciences engineering symbols Graphite 010306 general physics 0210 nano-technology Raman spectroscopy Carbon |
| Zdroj: | Comptes Rendus Chimie. 20:116-124 |
| ISSN: | 1631-0748 |
| DOI: | 10.1016/j.crci.2016.04.005 |
| Popis: | Heavy alkali metal-arsenic alloys intercalate easily into graphite, leading to the formation of a new family of ternary graphite intercalation compounds (GICs). Pure phases formulated as MAsxC4s (M = K, Rb or Cs; s = stage; x ≤ 1) have been synthesized at the laboratory. This article aims to expose all physical measurements performed on these intercalation compounds to get an idea about their electronic properties. Electrical conductivity measurements have been performed both parallel and perpendicular to the basal planes, between 4.2 and 295 K. Room temperature resistivity values lie between 16 and 35 μΩ cm and the anisotropic resistivity takes a value of an order of magnitude of 10 4 . Dynamic magnetic susceptibility measurements, carried out at low temperature on some phases, showed that they do not exhibit superconducting transition up to 1.3 K. Raman spectroscopy investigation, which is a useful tool to study the electronic and the chemical stability of GICs, highlighted a significant up-shift of the G-band of the carbon intra-layer vibration frequency, compared to the pure graphite vibration mode. Undoubtedly, this is related to the electronic charge transfer established between graphite layers and intercalated species. |
| Databáze: | OpenAIRE |
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