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Combustion Synthesis, Powder Characteristics, and Shrinkage Behavior of a Gadolinia–Ceria System
Author(s) -
Lenka Raja Kishora,
Mahata Tarasankar,
Sinha Pankaj Kumar,
Sharma Beant Prakash
Publication year - 2006
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01315.x
Subject(s) - shrinkage , materials science , dilatometer , agglomerate , nanocrystalline material , chemical engineering , crystallite , economies of agglomeration , combustion , particle size , sintering , composite material , mineralogy , metallurgy , nanotechnology , thermal expansion , chemistry , organic chemistry , engineering
Pure and gadolinia‐doped nanocrystalline ceria powders were prepared through the gel combustion route. Analysis of crystallite size, surface area, and particle size indicates that the powders are agglomerates of nanosize primary particles. The degree of agglomeration increases with increase in the gadolinia content. The shrinkage behavior on firing of the powders was studied using a dilatometer. Although the shrinkage starts at a lower temperature, the densification completes at a higher temperature as the gadolinia content increases. The wider temperature range required for shrinkage in high gadolinia content ceria is attributed to the wider distribution of interparticle pore size in the green compact.