Formation and structure of misfit dislocations at the La2Zr2O7-Y2O3-stabilized ZrO2(001) reaction front during vapour-solid reaction

Autor:	S. Senz, C. J. Lu, D. Hesse
Rok vydání:	2002
Předmět:	Materials science Lattice constant Condensed matter physics Lattice (order) Pyrochlore engineering Nucleation Perpendicular Dislocation engineering.material Condensed Matter Physics Yttria-stabilized zirconia Burgers vector
Zdroj:	Philosophical Magazine Letters. 82:167-174
ISSN:	1362-3036 0950-0839
DOI:	10.1080/09500830110118058
Popis:	La2 Zr2 O7 (LZO)-based pyrochlore islands were grown on a Y2 O3 -stabilized ZrO2 (YSZ) (001) single-crystal surface by the reaction between La2O3 vapour and the crystal. A network of interfacial edge dislocations with line directions [100] and [010] and Burgers vectors ( as/2)[101] and ( as/2)[011] respectively ( as being the lattice parameter of the YSZ) was observed at the moving LZO-YSZ reaction front. The interface-parallel component of the Burgers vectors accommodates the LZO-YSZ lattice mismatch of +5.0%, while the perpendicular component causes a slight tilt of the LZO lattice with respect to the YSZ lattice. The dislocation half-loops nucleate and glide on inclined {101} planes at the edges of the four corners of the growing islands.
Databáze:	OpenAIRE
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