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Calorimetric measurement of surface and interface enthalpies of yttrium-doped barium zirconate

Grant number: 13/10928-0
Support Opportunities:Scholarships abroad - Research Internship - Doctorate
Effective date (Start): September 01, 2013
Effective date (End): August 31, 2014
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Nonmetallic Materials
Principal Investigator:Reginaldo Muccillo
Grantee:Mayra Dancini Gonçalves
Supervisor: Alexandra Navrotsky
Host Institution: Instituto de Pesquisas Energéticas e Nucleares (IPEN). Secretaria de Desenvolvimento Econômico (São Paulo - Estado). São Paulo , SP, Brazil
Research place: University of California, Davis (UC Davis), United States  


Yttrium-doped barium zirconate (BZY) polycrystalline ceramics with perovskite structure have technological importance as solid electrolytes in solid oxide fuel cells operating at intermediate temperatures (500-700 C). The issues related to both nanoparticle agglomeration and consequent low final densification are yet unsolved problems. Our idea to solve these problems is to carry out a detailed evaluation of the pattern of the nanoparticle surfaces, namely, the character and the function of the chemical species attached to these surfaces. These species are known to hinder the interaction among the nanoparticles. The experimental analysis of the surface and interface energies of BZY nanoparticles by drop solution calorimetry combined with water adsorption calorimetry (available at the laboratories of Prof. Navrotsky - a pioneer in this research area - at the University of California at Davis) might give a significant contribution to this study. The collected data shall give insights to make advancements in understanding the difficulties found for sintering these perovskites. (AU)

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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)
GONCALVES, M. D.; MARAM, P. S.; MUCCILLO, R.; NAVROTSKY, A.. Enthalpy of formation and thermodynamic insights into yttrium doped BaZrO3. JOURNAL OF MATERIALS CHEMISTRY A, v. 2, n. 42, p. 17840-17847, . (13/10928-0)
GONCALVES, M. D.; MARAM, PARDHA S.; NAVROTSKY, A.; MUCCILLO, R.. Effect of synthesis atmosphere on the proton conductivity of Y-doped barium zirconate solid electrolytes. CERAMICS INTERNATIONAL, v. 42, n. 12, p. 13689-13696, . (13/07296-2, 13/10928-0)

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