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SUMMARY:The conduction band of the lanthanide doped chromium disulfides Cu
 Cr0.99Ln0.01S2 (Ln=La\, Ce\, Gd): XANES investigations
DTSTART;VALUE=DATE-TIME:20200715T074000Z
DTEND;VALUE=DATE-TIME:20200715T080000Z
DTSTAMP;VALUE=DATE-TIME:20260613T124835Z
UID:indico-contribution-1807@indico.inp.nsk.su
DESCRIPTION:Speakers: Evgeniy Korotaev (Nikolaev Institute of Inorganic Ch
 emistry  of the Siberian Branch of the Russian Academy of Sciences)\nThe s
 olid solution based on the copper chromium disulfide CuCrS2 are promising 
 functional materials for modern electronics applications. These compounds 
 exhibit the potential properties for practical usage: the thermoelectric p
 roperties [1]\, the ionic conductivity [2]\, the helimagnetic arrangement 
 [3-4]\, the colossal magnetoresistance and the phase metal-insulator trans
 ition [4].\nThere are several approaches to control the electric and magne
 tic properties of CuCrS2-based compounds: the cationic substitution of chr
 omium atoms with transition metal atoms (CuCr1-xMxS2\, M = V\, Fe\, Mn)\, 
 the co-intercalation of the Van der Waals gap with two atom types (Cu1-xAg
 xCrS2) and the chalcogen substitution (CuCrS2\, X = S\, Se\, Te). It was s
 hown that the low dopant solid solutions CuCr1-xMxS2 exhibit promising the
 rmoelectric properties. The key aspect to control the electrophysical prop
 erties of thermoelectric materials is the understanding of the electronic 
 structure features. The corresponding data could be obtained from both the
  quantum-chemical calculations and the experimental techniques sensitive t
 o the electronic structure. In this regard\, the study of the X-ray absorp
 tion edges near edge structure (XANES) features could provide useful infor
 mation about the conduction band structure. Thus\, this study involves a p
 urposeful synthesis of the lanthanide doped solid solutions CuCr0.99Ln0.01
 S2 (Ln=La\, Ce\, Gd) and detailed study of their electronic and band struc
 ture. A comprehensive experimental and theoretical study of the X-ray abso
 rption edges of the matrix elements and doped-lanthanide atoms in the cati
 on-substituted disulfides CuCr0.99Ln0.01S2 was carried out. Based on the o
 btained results\, the cationic substitution with lanthanide atoms affect t
 o the conduction band structure was studied.\nThe study was carried out wi
 th a funding from the Russian Science Foundation (project No. 19-73-10073)
 . The software program design for the experimental XANES spectra shape cor
 rection was supported by RFBR grant №16-32-00612.\n [1] Korotaev E.V\, S
 yrokvashin M.M.\, I.Yu. Filatova\, et al. // J. Electron. Mater. -2018.-47
 . –p. 3392-3397. \n[2] Akmanova G.R.\, Davleshina A.D.\, // Lett.Mater.-
 2013.- 3. –p.76-78.\n[3] Karmakar A.\, Dey K.\, Chatterjee S. et al. // 
 Appl. Phys. Letters. – 2014. –104\, N. 5. – P. 052906.\n[4] Abramova
  G.M.\, Petrakovskii G.A. // Low Temperature Physics. – 2006. – 32\, N
 . 8/9. – p. 954-967.\n\nhttps://indico.inp.nsk.su/event/24/contributions
 /1807/
LOCATION:Zoom Zoom 860 5034 1820
URL:https://indico.inp.nsk.su/event/24/contributions/1807/
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