Relation between grain growth, densification and surface diffusion in solid state sintering- : a direct observation

A direct observation of the grain growth and densification of BaTiO3 ceramics was made using a TEM equipped with an in-situ installed heating platform. Both real two-sphere and three-sphere models for BaTiO3 ceramics were found and parallel processes of the shrinkage between particles and the grain...

Full description

Saved in:
Bibliographic Details
Published in:Journal of materials science 2005-11, Vol.40 (21), p.5711-5719
Main Authors: SHI, Jian-Lin, DEGUCHI, Yoichi, SAKABE, Yukio
Format: Article
Language:English
Subjects:
Applied sciences
Barium titanates
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Coarsening
Cross-disciplinary physics: materials science
rheology
Densification
Diffusion
Exact sciences and technology
General studies
Grain growth
Grains
Heating
Materials science
Materials synthesis
materials processing
Physics
Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation
Shrinkage
Surface diffusion
Technical ceramics
Titanium dioxide
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A direct observation of the grain growth and densification of BaTiO3 ceramics was made using a TEM equipped with an in-situ installed heating platform. Both real two-sphere and three-sphere models for BaTiO3 ceramics were found and parallel processes of the shrinkage between particles and the grain growth (coarsening) were observed during the heating process. Attempts to relate the grain growth and densification were made which reveal, though roughly, the close relation between the two competing process: they took place simultaneously and in parallel, therefore it is believed that the process took place via the same mass transport mechanism. Surface diffusion on the TiO2 particle surface was observed directly, which takes place with the co-motion of several lattice layers from a smaller grain onto the surface of an adjacent larger one. The surface diffusion was accompanied by the diminishing of a small grain, i.e., overall grain growth. 17 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-005-1474-7