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Title: Diffusion-induced grain-boundary migration in ceria-stabilized tetragonal zirconia polycrystals

Abstract

The microstructure and microchemistry of grain-boundary regions in (CeO{sub 2} + La{sub 2}O{sub 3})-stabilized tetragonal ZrO{sub 2} polycrystals (Ce(La)-TZP) were studied by means of transmission electron microscopy (TEM). Evidence was found for the existence of crystalline and vitreous intergranular phases situated in small pockets at multiple grain junctions and in thin films along grain boundaries. In this ceramic system grain-boundary migration was observed in-situ in the TEM in sample areas subjected to electron irradiation. Interfaces migrated away from their centers of curvature. Evidence was found for Ce de-alloying in the volume swept by the advancing boundaries. It is suggested that the coherency lattice strain brought about by a partial reduction of Ce, resulting in the diffusion of Ce{sup 3 +} along grain boundaries to free surfaces, is the driving force for this phenomenon.

Authors:
 [1]
  1. Div. of Materials Science and Technology, Council for Scientific and Industrial Research, Pretoria 0001 (ZA)
Publication Date:
OSTI Identifier:
5776744
Resource Type:
Journal Article
Journal Name:
Journal of the American Ceramic Society; (USA)
Additional Journal Information:
Journal Volume: 74:2; Journal ID: ISSN 0002-7820
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; GRAIN BOUNDARIES; MIGRATION; ZIRCONIUM OXIDES; CHEMISTRY; MICROSTRUCTURE; ALLOYS; CERIUM OXIDES; CRYSTAL LATTICES; LANTHANUM OXIDES; CERIUM COMPOUNDS; CHALCOGENIDES; CRYSTAL STRUCTURE; LANTHANUM COMPOUNDS; OXIDES; OXYGEN COMPOUNDS; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; ZIRCONIUM COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies

Citation Formats

Schmid, H K. Diffusion-induced grain-boundary migration in ceria-stabilized tetragonal zirconia polycrystals. United States: N. p., 1991. Web. doi:10.1111/j.1151-2916.1991.tb06892.x.
Schmid, H K. Diffusion-induced grain-boundary migration in ceria-stabilized tetragonal zirconia polycrystals. United States. https://doi.org/10.1111/j.1151-2916.1991.tb06892.x
Schmid, H K. 1991. "Diffusion-induced grain-boundary migration in ceria-stabilized tetragonal zirconia polycrystals". United States. https://doi.org/10.1111/j.1151-2916.1991.tb06892.x.
@article{osti_5776744,
title = {Diffusion-induced grain-boundary migration in ceria-stabilized tetragonal zirconia polycrystals},
author = {Schmid, H K},
abstractNote = {The microstructure and microchemistry of grain-boundary regions in (CeO{sub 2} + La{sub 2}O{sub 3})-stabilized tetragonal ZrO{sub 2} polycrystals (Ce(La)-TZP) were studied by means of transmission electron microscopy (TEM). Evidence was found for the existence of crystalline and vitreous intergranular phases situated in small pockets at multiple grain junctions and in thin films along grain boundaries. In this ceramic system grain-boundary migration was observed in-situ in the TEM in sample areas subjected to electron irradiation. Interfaces migrated away from their centers of curvature. Evidence was found for Ce de-alloying in the volume swept by the advancing boundaries. It is suggested that the coherency lattice strain brought about by a partial reduction of Ce, resulting in the diffusion of Ce{sup 3 +} along grain boundaries to free surfaces, is the driving force for this phenomenon.},
doi = {10.1111/j.1151-2916.1991.tb06892.x},
url = {https://www.osti.gov/biblio/5776744}, journal = {Journal of the American Ceramic Society; (USA)},
issn = {0002-7820},
number = ,
volume = 74:2,
place = {United States},
year = {Fri Feb 01 00:00:00 EST 1991},
month = {Fri Feb 01 00:00:00 EST 1991}
}