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DOI | 10.1016/J.JPCS.2019.109107 | ||||
Año | 2019 | ||||
Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We report the structural, energetics, and electronic properties of free-standing binary clusters (TiO2)(10) with substitutional metallic and non-metallic impurities. The selected (TiO2)(10) cluster has tetrahedral symmetry and is the putative low energy structure for this size. The substitutional impurity can be located at a vertex (4 sites) or at an edge (6 sites). The former has a binding energy only 0.03 eV/atom less than the latter, so they can be considered as almost degenerate. A total of 28 impurities are considered in the present report. We study the edge substitutional place since this environment is very similar to the corresponding one in the bulk, which makes these system a possible model for the bulk-like structures. Another advantage of the cluster considered here is that its energy gap is as large as the one presented in the bulk phases (anatase and rutile). This system allows us to mimic the bulk behavior without the use of intrasite Coulomb corrections (U) usually applied to the 3d orbital electrons of Ti atoms U-d and 2p orbital electrons of the O atoms U-p; they are generally applied as parameters to fit the real energy gap observed in bulk (TiO2) systems. We show results for the formation energies, energy gaps and magnetism suggesting a way to control the band gap by means of the use of the appropriate impurity used in the substitution.
Ord. | Autor | Género | Institución - País |
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1 | Aguilera–del–Toro, R. H. | - |
UNIV VALLADOLID - España
UNIV AUTONOMA SAN LUIS POTOSI - México Universidad de Valladolid - España Universidad Autonoma de San Luis Potosi - México |
2 | Aguilera-Granja, F. | Hombre |
UNIV AUTONOMA SAN LUIS POTOSI - México
Universidad Autonoma de San Luis Potosi - México |
3 | VOGEL-MATAMALA, EUGENIO EMILIO | Hombre |
Universidad de La Frontera - Chile
Centro para el Desarrollo de la Nanociencia y la Nanotecnologia - Chile |
Fuente |
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Consejo Nacional de Ciencia y Tecnología |
Fondo Nacional de Desarrollo Científico y Tecnológico |
CONACYT Mexico |
FONDECYT (Chile) |
Universidad de Valladolid |
Financiamiento Basal para Centros Científicos y Tecnológicos de Excelencia |
Consejo Nacional de Ciencia y TecnologÃa |
Fondo Nacional de Desarrollo CientÃfico y Tecnológico |
Financiamiento Basal para Centros Cientfficos y Tecnologicos de Excelencia (Chile) through the Center for Development of Nanoscience and Nanotechnology (CEDENNA) |
Universidad de Valladolid (Spain) |
Center for Nanoscience and Nanotechnology, Tel Aviv University |
Agradecimiento |
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We acknowledge the comments and discussions with Prof. A. Vega and L.C. Balbas. R.H.A.T acknowledges financial support from CONACYT Mexico, scholarship 415121 and the financial support of the Universidad de Valladolid (Spain). Partial support from the following Chilean sources is acknowledged: Fondecyt (Chile) under contracts 1150019 and 1190036, and Financiamiento Basal para Centros Cientfficos y Tecnologicos de Excelencia (Chile) through the Center for Development of Nanoscience and Nanotechnology (CEDENNA, Contract FB0807). We are also grateful to J. Limon for computational support and to Dr. Erik Dfaz-Cervantes for his help, calculations and comments on the use of hybrid functionals. |
We acknowledge the comments and discussions with Prof. A. Vega and L.C. Balbas. R.H.A.T acknowledges financial support from CONACYT Mexico , scholarship 415121 and the financial support of the Universidad de Valladolid (Spain). Partial support from the following Chilean sources is acknowledged: Fondecyt (Chile) under contracts 1150019 and 1190036 , and Financiamiento Basal para Centros Científicos y Tecnológicos de Excelencia (Chile) through the Center for Development of Nanoscience and Nanotechnology (CEDENNA, Contract FB0807 ). We are also grateful to J. Limón for computational support and to Dr. Erik Díaz–Cervantes for his help, calculations and comments on the use of hybrid functionals. . |