Characterization of nanostructured scandia-zirconia ceramics consolidated by spark plasma sintering.

• Grant number: 16/06205-1
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• Start date: August 01, 2016
• End date: July 31, 2019
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Eliana Navarro dos Santos Muccillo
• Grantee: Robson Lopes Grosso
• Host Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil
• Associated scholarship(s): 17/25501-3 - Grain size dependent phase transition and Hall-Petch relationship in nanocrystalline Scandia-Zirconia: an in-situ TEM study, BE.EP.PD

Abstract

In this work, the effects of grain size on microstructural, electrical, and mechanical properties in fully dense nanostructured scandia-zirconia ceramics obtained by Spark Plasma Sintering will be investigated. Due to recent advances in this sintering technique, it is finally possible to obtain nanostructured ceramics with unique and unexpected properties for some classes of materials, such as translucency in scandia-zirconia system. Samples of ZrO2 containing 6 to 20 mol% Sc2O3 were synthesized by hydroxide coprecipitation method, calcined, and sintered at low temperatures (700 to 800 °C) and high pressures (1.5 and 2 GPa). Characterization of these materials will be performed as a function of composition and grain size within the range of 8 to 20 nm. Microstructural characterization by atomic force microscopy will allow analysis of morphology and grain size with detail. Electrical conductivity measurements will be carried out by impedance spectroscopy within the frequency range of 5 Hz to 13 MHz as a function of temperature. Raman spectroscopy will allow for identifying lower intensity crystalline structures in order to verify polymorphism and properties effect correlations. Finally, the effect of composition and grain size on mechanical properties will be evaluated. Based on these results, it will be possible to identify appropriate range of composition and grain size for nanostructured solid electrolyte application in solid oxide fuel cell.

Scientific publications

(4)

(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)

GROSSO, ROBSON L.; VIKRANT, K. S. N.; FENG, LIN; MUCCILLO, ELIANA N. S.; MUCHE, DERECK N. F.; JAWAHARRAM, GOWTHAM S.; BARR, CHRISTOPHER M.; MONTERROSA, ANTHONY M.; CASTRO, RICARDO H. R.; GARCIA, R. EDWIN; et al. Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in Zirconia II: Interfacial thermodynamics and transport mechanisms. ACTA MATERIALIA, v. 200, p. 1008-1021, NOV 2020. (16/06205-1, 17/25501-3)

GROSSO, ROBSON L.; MUCHE, DERECK N. F.; YONAMINE, TAEKO; MUCCILLO, ELIANA N. S.; DILLON, SHEN J.; CASTRO, RICARDO H. R.. Sintering of translucent and single-phase nanostructured scandia-stabilized zirconia. Materials Letters, v. 253, p. 246-249, OCT 15 2019. (16/06205-1, 17/25501-3)

GROSSO, ROBSON L.; MUCCILLO, ELIANA N. S.; MUCHE, DERECK N. F.; JAWAHARRAM, GOWTHAM S.; BARR, CHRISTOPHER M.; MONTERROSA, ANTHONY M.; CASTRO, RICARDO H. R.; HATTAR, KHALID; DILLON, SHEN J.. In Situ Transmission Electron Microscopy for Ultrahigh Temperature Mechanical Testing of ZrO2. Nano Letters, v. 20, n. 2, p. 1041-1046, FEB 2020. (16/06205-1, 17/25501-3)

VIKRANT, K. S. N.; GROSSO, ROBSON L.; FENG, LIN; MUCCILLO, ELIANA N. S.; MUCHE, DERECK N. F.; JAWAHARRAM, GOWTHAM S.; BARR, CHRISTOPHER M.; MONTERROSA, ANTHONY M.; CASTRO, RICARDO H. R.; GARCIA, R. EDWIN; et al. Ultrahigh temperature in situ transmission electron microscopy based bicrystal coble creep in zirconia I: Nanowire growth and interfacial diffusivity. ACTA MATERIALIA, v. 199, p. 12-pg., 2020-10-15. (16/06205-1, 17/25501-3)