The effects of bismuth intercalation on structure and thermal conductivity of TiS2 |
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| Affiliation: | 1. Unité de Recherche Matériaux et Energies Renouvelables – URMER, Université de Tlemcen, Algeria;2. Laboratoire de Physique Théorique, Ecole Préparatoire en Sciences et Techniques, B.P. 230, 13000 Tlemcen, Algeria;3. Laboratoire d’Etude des Microstructures et de Mécanique des Matériaux, LEM3 UMR CNRS 7239, Université de Lorraine UL, Metz 57045, France;4. Laboratoire d’Excellence “DAMAS”: Design of Metal Alloys for low-mAss Structures, Université de Lorraine – Metz, Ile du Saulcy, 57045 Metz Cedex 01, France;1. Department of Physics and Institute of Photonics and Information Technology, Chonbuk National University, Jeonju, 54896, Republic of Korea;2. Center for Advanced X-ray Science, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea;1. Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Soochow University, Suzhou 215123, China;2. State Key Laboratory of Silicon Materials and School of Materials Science & Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, China;1. Stephenson Institute for Renewable Energy, Department of Chemistry, University of Liverpool, Liverpool, UK;2. College of Chemistry and Chemical Engineering, Central South University, Changsha, China;3. National Graphene Institute and School of Materials, The University of Manchester, Manchester, UK;4. School of Physical Science and Technology, ShanghaiTech University, Shanghai, China |
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| Abstract: | The structure and thermal conductivity of the bismuth (Bi) intercalated compounds BixTiS2 (0 ≤ x ≤ 0.25) were investigated by using X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and thermal conductivity measurements. The results indicated that besides lattice expansion and distortion, bismuth intercalation caused structural transition of BixTiS2 from stage-1 to stage-2 as x ≥ ∼0.1, which led to the appearance of D4 and A2 modes in Raman spectra. The enhancement of relative intensities of D4 and A2 peaks with increasing Bi content reflected increase of the concentration of stage-2 phase in the samples. The red shift of mode Eg as well as D4 and A2 would reflect weakening of intra-layer bonds, while the blue shift of A1g after intercalation suggested the enhancement of chemical binding in the van der Waals gaps due to charge transfer. In addition, the weakening of A1g intensity can be explained by the lattice distortion produced by bismuth intercalation. Remarkable reduction in (lattice) thermal conductivity of titanium disulfide (TiS2) through Bi intercalation was realized, which could be attributed to the phonon scattering by “rattling” of the intercalated bismuth atoms in the van der Waals gaps of TiS2. |
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