Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials
The charge distribution study of metal atoms in CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) solid solutions was carried out using X-ray photoelectron spectroscopy (XPS). The analysis of the binding energy of S2p, Cu2p, Cr2p, Ln3d and Ln4d levels...
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2022-12-01
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| author | Evgeniy V. Korotaev Mikhail M. Syrokvashin Irina Yu. Filatova Aleksandr V. Sotnikov Alexandr V. Kalinkin |
| author_facet | Evgeniy V. Korotaev Mikhail M. Syrokvashin Irina Yu. Filatova Aleksandr V. Sotnikov Alexandr V. Kalinkin |
| author_sort | Evgeniy V. Korotaev |
| collection | DOAJ |
| description | The charge distribution study of metal atoms in CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) solid solutions was carried out using X-ray photoelectron spectroscopy (XPS). The analysis of the binding energy of S2p, Cu2p, Cr2p, Ln3d and Ln4d levels allows one to determine the oxidation state of atoms. Copper atoms were found to be monovalent. Chromium and lanthanide atoms were found to be in the trivalent state. Sulfur atoms were found to be in the divalent state. Cationic substitution was found to occur via an isovalent mechanism of Cr<sup>3+</sup> to Ln<sup>3+</sup>. The obtained results were used for the interpretation of the Seebeck coefficient increase for CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> solid solutions in contrast to the initial CuCrS<sub>2</sub> matrix. The largest Seebeck coefficient values of 142 and 148 µV/K were observed at 500 K for CuCr<sub>0.99</sub>Sm<sub>0.01</sub>S<sub>2</sub> and CuCr<sub>0.99</sub>Pr<sub>0.01</sub>S<sub>2</sub>, respectively. The obtained values are 1.4 times greater in comparison with those for the initial matrix (105 µV/K). |
| first_indexed | 2024-03-09T16:10:28Z |
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| id | doaj.art-e22a5c2c7df3446e96081749eeaf575e |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T16:10:28Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-e22a5c2c7df3446e96081749eeaf575e2023-11-24T16:20:56ZengMDPI AGMaterials1996-19442022-12-011524874710.3390/ma15248747Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric MaterialsEvgeniy V. Korotaev0Mikhail M. Syrokvashin1Irina Yu. Filatova2Aleksandr V. Sotnikov3Alexandr V. Kalinkin4Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, RussiaNikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, RussiaNikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, RussiaNikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, RussiaBoreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, 630090 Novosibirsk, RussiaThe charge distribution study of metal atoms in CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) solid solutions was carried out using X-ray photoelectron spectroscopy (XPS). The analysis of the binding energy of S2p, Cu2p, Cr2p, Ln3d and Ln4d levels allows one to determine the oxidation state of atoms. Copper atoms were found to be monovalent. Chromium and lanthanide atoms were found to be in the trivalent state. Sulfur atoms were found to be in the divalent state. Cationic substitution was found to occur via an isovalent mechanism of Cr<sup>3+</sup> to Ln<sup>3+</sup>. The obtained results were used for the interpretation of the Seebeck coefficient increase for CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> solid solutions in contrast to the initial CuCrS<sub>2</sub> matrix. The largest Seebeck coefficient values of 142 and 148 µV/K were observed at 500 K for CuCr<sub>0.99</sub>Sm<sub>0.01</sub>S<sub>2</sub> and CuCr<sub>0.99</sub>Pr<sub>0.01</sub>S<sub>2</sub>, respectively. The obtained values are 1.4 times greater in comparison with those for the initial matrix (105 µV/K).https://www.mdpi.com/1996-1944/15/24/8747layered copper-chromium disulfideXPSlanthanidesSeebeck coefficientthermoelectricity |
| spellingShingle | Evgeniy V. Korotaev Mikhail M. Syrokvashin Irina Yu. Filatova Aleksandr V. Sotnikov Alexandr V. Kalinkin Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials Materials layered copper-chromium disulfide XPS lanthanides Seebeck coefficient thermoelectricity |
| title | Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials |
| title_full | Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials |
| title_fullStr | Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials |
| title_full_unstemmed | Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials |
| title_short | Charge Distribution in Layered Lanthanide-Doped CuCr<sub>0.99</sub>Ln<sub>0.01</sub>S<sub>2</sub> (Ln = Pr–Tb) Thermoelectric Materials |
| title_sort | charge distribution in layered lanthanide doped cucr sub 0 99 sub ln sub 0 01 sub s sub 2 sub ln pr tb thermoelectric materials |
| topic | layered copper-chromium disulfide XPS lanthanides Seebeck coefficient thermoelectricity |
| url | https://www.mdpi.com/1996-1944/15/24/8747 |
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