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 Citations (Scopus)

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 - 1989

Fingerprint

Nickel oxide
nickel oxides
Quenching
quenching
Annealing
annealing
air
imaging techniques
spinel
phase transformations
valleys
flat surfaces
precipitates
High resolution electron microscopy
surface layers
electron microscopy
Air
Powders
Macros
cooling

ASJC Scopus subject areas

  • Electrochemistry
  • Physical and Theoretical Chemistry
  • Energy Engineering and Power Technology
  • Materials Chemistry
  • Condensed Matter Physics

Cite this

Hrtem study of the surface and bulk of nickel oxide : Influence of annealing and quenching. / Carrillo-Cabrera, Wilder; Smith, David.

In: Solid State Ionics, Vol. 32-33, No. PART 2, 1989, p. 749-758.

Research output: Contribution to journalArticle

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