Hrtem study of the surface and bulk of nickel oxide: Influence of annealing and quenching

Wilder Carrillo-Cabrera, David Smith

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

Changes in the surface and bulk structure of a commercial NiO powder, as produced by annealing/quenching treatments, have been charateerized by high resolution electron microscopy, especially by means of the surface profile imaging technique. Particles of the as-received NiO exhibited macroscopically round surfaces with atomic steps and also {111} micro-facets forming a "hill and valley" structure. Larger macro-facetted particles with (100), (110) and (111) faces were grown by annealing at T=1360°C. Thin amorphous near-surface layers appeared during cooling in an air flux from T≤1360°C. Phase transformation to a defect-spinel oxygen-rich phase can be induced by quenching in air from 1600°C whereas small precipitates are produced in the subsurface region and in the bulk by water quenching from the same temperature.

Original languageEnglish (US)
Pages (from-to)749-758
Number of pages10
JournalSolid State Ionics
Volume32-33
Issue numberPART 2
DOIs
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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