Strontium hafnate phases by anodic spark conversion

Joachim P. Schreckenbach, N. Meyer, G. Marx, B. T. Lee, W. M. Kriven

Research output: Contribution to journalArticlepeer-review


The preparation of strontium hafnate (SrHfO 3 ) phases by the technique of anodic spark conversion has been demonstrated. This method involves anodic hafnia (HfO 2 ) generated during the pre-spark anodization, and subsequent conversion of hafnia to strontium hafnate in the anodic spark regime. Hafnium, as a valve metal, forms a dense, pore-free, oxide barrier film, up to about 100 nm thickness, in aqueous electrolyte systems during potentiodynamic anodization. The high potential sparking reactions initiate the transformation of the monoclinic hafnia phase to the perovskite-type strontium hafnate phase. The anodic coatings generated and the microcrystalline hafnate phases were characterized by Raman spectroscopy and electron microscopy techniques (TEM/SADP) at different stages of the anodic conversion process.

Original languageEnglish (US)
Pages (from-to)97-101
Number of pages5
JournalApplied Surface Science
Issue number1-4
StatePublished - Jan 31 2002


  • Anodic films
  • Conversion coatings
  • Hafnates
  • Hafnia
  • Spark conversion

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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