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Development of advanced CaCu3Ti4O12 ceramics in the form of powders, bulks, and nanostructured films: an integrated studied of its multifunctional properties

Grant number: 18/18236-4
Support Opportunities:Scholarships in Brazil - Doctorate (Direct)
Effective date (Start): January 01, 2019
Effective date (End): June 30, 2023
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Miguel Ángel Ramírez Gil
Grantee:Henrique Piccoli Moreno
Host Institution: Faculdade de Engenharia (FEG). Universidade Estadual Paulista (UNESP). Campus de Guaratinguetá. Guaratinguetá , SP, Brazil
Associated research grant:13/07296-2 - CDMF - Center for the Development of Functional Materials, AP.CEPID

Abstract

Ceramics based on the CaCu3Ti4O12 system have been receiving a great deal of attention due to its multifunctional properties and its potential application in lasers, LEDs, FEDs, photocatalysts, supercapacitors, varistors, gas sensors, resistive memories, etc. The objective of this project is to study the effect of the additions of X% of W6+ to the CaCu3Ti4O12 (with X= 0.00, 0.25, 0.50, 0.75, 1.00) in the form of powders and bulks prepared by solid state reaction method, and nanostructured films fabricated by the RF-sputtering method. The powders will be characterized regarding its (micro)structural and optical properties. Structures will be analyzed on the long, medium and short range using X-Ray diffratometry (XRD), XANES/EXAFS, Photoluminescent response (PL), Raman and Ultraviolet visible (UV-Vis). On the CCTO ceramics with the W6+ addition conformed as bulks, a comparative study will be performed between conventional sintering and electric field-assisted flash sintering, and its influence on (micro)structure and, dielectric and non-ohmic properties. The samples will be characterized using the Rietveld refinement technique for determining its crystalline structure and the phases present, coupled with FEG/SEM and TEM/HRTEM techniques. Impedance spectroscopy (IE) and tension-current measurements, Atomic Force Microscopy (AFM) and Electrostatic Force Microscopy (EFM), will be used in order to study the active barriers at the grain boundaries, related to the materials' dielectric and varistor responses. Nanostructured dense and porous films will be deposited on appropriate substrates using the RF-sputtering technique. On the dense films, the dielectric and varistor responses will be studied, and on the porous films, the sensor response to CO will be subject to study. In fact there is no integrated studies in the literature regarding the multifunctional properties of CCTO ceramics in the form of powders, bulks, and films, making this an innovative project from a cientific and technologic standpoint. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MORENO, H.; DAMM, M.; FREITAS, S. M.; REZENDE, M. V. S.; SIMOES, A. Z.; BIASOTTO, G.; MASTELARO, V. R.; TEIXEIRA, V. C.; RAMIREZ, M. A.. Unveiling photoluminescent response of Ce-doped CaCu3Ti4O12: An experimental-theoretical approach br. Journal of Alloys and Compounds, v. 923, p. 16-pg., . (18/18236-4)
MORENO, H.; CORTES, J. A.; PRAXEDES, F. M.; FREITAS, S. M.; REZENDE, M. V. S.; SIMOES, A. Z.; TEIXEIRA, V. C.; RAMIREZ, M. A.. Tunable photoluminescence of CaCu3Ti4O12 based ceramics modified with tungsten. Journal of Alloys and Compounds, v. 850, . (18/18236-4)
SIMOES, A. Z.; ORTEGA, P. P.; RAMIREZ, M. A.; MORENO, H.; ALDAO, C. M.; PONCE, M. A.; MOURA, F.. Magnetoelectric coupling at room temperature in LaTiO3/ SrTiO3 heterojunctions. Materials Research Bulletin, v. 162, p. 8-pg., . (13/07296-2, 19/07413-5, 18/18236-4)
CABRAL, ANA CRISTINA TOLENTINO; TANTA, URBANO MIGUEL TAFUR; SIMOES, ALEXANDRE ZIRPOLI; BASTOS, WAGNER; MORENO, HENRIQUE; RAMIREZ, MIGUEL ANGEL; PONCE, MIGUEL ADOLFO; MOURA, FRANCISCO. Unveiling the metal-insulator transition at YTiO3/LaTiO3 interfaces grown by the soft chemical method. Materials Chemistry and Physics, v. 302, p. 10-pg., . (13/07296-2, 17/10819-8, 18/18236-4)
CORTES, J. A.; MORENO, H.; ORREGO, S.; BEZZON, V. D. N.; RAMIREZ, M. A.. Dielectric and non-ohmic analysis of Sr2- influences on CaCu3Ti4O12-based ceramic composites. Materials Research Bulletin, v. 134, . (18/18236-4)
MORENO, H.; DOMINGUES, G. L.; ASSIS, M.; ORTEGA, P. P.; MASTELARO, V. R. .; RAMIREZ, M. A. .; SIMOES, A. . Z.. The Relationship between Photoluminescence Emissions and Photocatalytic Activity of CeO2 Nanocrystals. Inorganic Chemistry, v. 62, n. 10, p. 13-pg., . (13/07296-2, 18/18236-4)

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