Novel coalescence-driven grain-growth mechanism during annealing/spark plasma sintering of NiO nanocrystals

A novel oriented attachment growth mechanism of nanograins has been suggested for spark plasma sintering and annealing of NiO nanopowder. A hierarchical microstructure built by cube-shaped nanograins was observed during pressure-less spark plasma sintering at temperatures above 1000°C and when the p...

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Bibliographic Details
Published inJournal of the European Ceramic Society Vol. 37; no. 15; pp. 4973 - 4977
Main Authors Akkiraju, K., Kashyap, S., Srivastav, Ajeet K., Chawake, Niraj, Bichler, L., Murty, B.S.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.12.2017
Subjects
Annealing
Densification
Grain growth
Nanoparticles
Spark plasma sintering
Nanoparticles
Spark plasma sintering
Annealing
Densification
Grain growth
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Summary:A novel oriented attachment growth mechanism of nanograins has been suggested for spark plasma sintering and annealing of NiO nanopowder. A hierarchical microstructure built by cube-shaped nanograins was observed during pressure-less spark plasma sintering at temperatures above 1000°C and when the powders were annealed in ambient atmosphere at and above 700°C. Irrespective of the processing method used, a rotation assisted grain attachment of irregularly shaped nanocrystals results in such a microstructure with parallel epitaxy, twinning or line defects at the grain interface. The unique microstructural features and the governing factors for the attachment process have been discussed.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2017.05.057