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Surface Energetics of Nanocrystalline YSZ Powders

Published online by Cambridge University Press:  20 February 2017

Gustavo C. C. Costa ,
Sergey V. Ushakov ,
Alexandra Navrotsky  and
Reginaldo Muccillo
Gustavo C. C. Costa
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, CA, USA. Materials Science and Technology Center, Nuclear and Energy Research Institute, S. Paulo, SP, Brazil
Sergey V. Ushakov
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, CA, USA.
Alexandra Navrotsky
Affiliation:
Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California at Davis, Davis, CA, USA.
Reginaldo Muccillo
Affiliation:
Materials Science and Technology Center, Nuclear and Energy Research Institute, S. Paulo, SP, Brazil
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Abstract

Nanocrystalline 8 and 12 mol % yttria stabilized zirconia (YSZ) powders with fluorite-type structure were synthesized by a precipitation method. Powders were characterized by X-ray diffraction, differential scanning calorimetry, thermogravimetry, and nitrogen adsorption analyses. Precipitation produced amorphous powder which crystallized at approximately 450-470 °C into a cubic phase with a crystallization enthalpy ranging from 13.7 ± 0.6 kJ/mol for 8YSZ to 11.7 ± 0.5 kJ/mol for 12YSZ. Integral heat of water adsorption at room temperature measured on 8YSZ was -63 ± 2 kJ/mol for coverage 4.1 ± 0.1H2O/nm2. Drop solution calorimetry experiments were performed in a custom made Calvet twin calorimeter using sodium molybdate 3Na2O 4MoO3 solvent. The preliminary values for surface enthalpies of hydrated surfaces are 0.8 ± 0.1 J/m2 for 8YSZ and 1.3 ± 0.1 J/m2 for 12YSZ.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1122: Symposium O – Structure/Property Relationships in Fluorite-Derivative Compounds , 2008 , 1122-O03-06
Copyright
Copyright © Materials Research Society 2009

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