Thermodynamic study of the phase stability of zirconia-scandia nanoparticles

• Grant number: 14/24022-6
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• Start date: January 15, 2015
• End date: January 14, 2016
• Field of knowledge: Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
• Principal Investigator: Eliana Navarro dos Santos Muccillo
• Grantee: Robson Lopes Grosso
• Supervisor: Ricardo H. R. Castro
• Host Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil
• Institution abroad: University of California, Davis (UC Davis), United States
• Associated to the scholarship: 12/03319-5 - Preparation and characterization of scandia-stabilized zirconia containing additives, BP.DR

Abstract

In this work, as complementation of current doctoral project, the thermodynamic of zirconia-scandia system is proposed to be investigate in more detail. The phase stability of zirconia-scandia system will be investigated based on thermodynamic data collected by water adsorptionmicrocalorimetry and high temperature oxide melt solution in order to create an unprecedentphase diagram at the nanoscale as a function of composition and average grain size.Nanostructured zirconia-scandia solid solutions will be synthesized by co-precipitation method.Thermodynamic data will be determined for polymorphs encountered in zirconia-scandiasystem within the range of 0 to 20 mol% Sc2O3. Specific surface area measurements ofnanoparticles will be performed by nitrogen adsorption. Structural analysis by X-ray diffraction will allow for defining the crystalline structure of each composition. Adsorption enthalpy, surface energy, and entropy for polymorphs encountered in zirconia-scandia system will be obtained for both anhydrous and hydrated materials at room temperature, based on athermodynamic analysis of water adsorption. Bulk enthalpies of anhydrous samples will beevaluated from the thermochemical cycle based on dissolution enthalpy data obtained at hightemperature. This systemic work on polymorphisms and thermodynamics will result in anoriginal phase diagram of the stable zirconia polymorph as a function of composition and grain size. (AU)

Scientific publications

(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.; MUCCILLO, ELIANA N. S.; CASTRO, RICARDO H. R.. Phase stability in scandia-zirconia nanocrystals. Journal of the American Ceramic Society, v. 100, n. 5, p. 2199-2208, MAY 2017. (14/24022-6)

GROSSO, ROBSON L.; MUCCILLO, ELIANA N. S.; CASTRO, RICARDO H. R.. Enthalpies of formation in the scandia-zirconia system. Journal of the American Ceramic Society, v. 100, n. 9, p. 4270-4275, SEP 2017. (14/24022-6)