KIT | KIT-Bibliothek | Impressum

Rare-earth adsorption at intergranular interfaces in silicon nitride ceramics: Subnanometer observations and theory

Shibata, N.; Painter, G. S.; Satet, R. L.; Hoffmann, M. J.; Pennycook, S. J.; Becher, P. F.

Abstract:
It is shown that the rare earths (REs) have different tendencies to
segregate to the grain surfaces in silicon nitride ceramics, and this
alters the filling of adsorption sites on the prismatic plane surfaces.
Here, the adsorption and binding strengths of RE segregants at
prismatic grain surfaces are determined by first-principles
calculations. The adsorption of three rare earths (La, Gd, and Lu) is
expected to be distinctly different at the predicted adsorption sites,
and this is confirmed by atomic-resolution scanning transmission
electron microscopy images. This combination of theory and experiment
provides a basis for understanding the adsorption behavior of RE
elements in silicon nitride ceramics.


Zugehörige Institution(en) am KIT Institut für Keramik im Maschinenbau (IKM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2005
Sprache Englisch
Identifikator ISSN: 1098-0121
KITopen ID: 1000007627
Erschienen in Physical Review / B
Band 72
Heft 14
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft KITopen Landing Page