Direct calorimetric measurement of grain boundary and surface enthalpies in yttria-stabilized zirconia.
Phys Chem Chem Phys
; 11(17): 3039-42, 2009 May 07.
Article
de En
| MEDLINE
| ID: mdl-19370196
ABSTRACT
We measured the change in enthalpy with grain size of a dense nanograined yttria-stabilized zirconia by oxide melt solution calorimetry and derived a grain boundary enthalpy, 0.73 +/- 0.19 J m(-2). Surface enthalpies of nanopowders are 2.21 +/- 0.14 J m(-2) (anhydrous surface) and 1.60 +/- 0.09 J m(-2) (hydrous surface). The grain boundary enthalpy is about a factor of two smaller than the enthalpy of the anhydrous surface, suggesting that densification which maintains nanosized grains is indeed thermodynamically driven. This is the first direct calorimetric measurement of grain boundary enthalpy in a ceramic.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Phys Chem Chem Phys
Sujet du journal:
BIOFISICA
/
QUIMICA
Année:
2009
Type de document:
Article
Pays d'affiliation:
États-Unis d'Amérique