Suppression of field crystallization of anodic niobia by oxygen

H. Habazaki, T. Ogasawara, H. Konno, K. Shimizu, S. Nagata, K. Asami, K. Takayama, P. Skeldon, G. E. Thompson

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Solid-solution Nb-O films containing up to 50 atom % oxygen, prepared by magnetron sputtering, were used to investigate the influence of the oxygen on field crystallization during anodizing at 100 V in 0.1 mol dm-3 ammonium pentaborate electrolyte at 333 K. The findings reveal that field crystallization is hindered dramatically by addition of 20 atom % oxygen to the substrate, while no crystallization occurs for a Nb-50 atom % O substrate. Prior thermal treatment accelerates field crystallization of niobium, but not the Nb-50 atom % O substrate. The thermal treatment is considered to promote generation of precursor sites for crystal nucleation. However, sufficient oxygen in the substrate may restrict precursor development and/or reduce the compressive stresses in the amorphous anodic niobia that can facilitate crystal growth.

Original languageEnglish
Pages (from-to)B173-B177
JournalJournal of the Electrochemical Society
Volume153
Issue number5
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Renewable Energy, Sustainability and the Environment
  • Surfaces, Coatings and Films
  • Electrochemistry
  • Materials Chemistry

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