Strontium hafnate phases by anodic spark conversion

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

doi:10.1016/S0169-4332(02)01039-5

Strontium hafnate phases by anodic spark conversion

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

Research output: Contribution to journal › Article › peer-review

Abstract

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 language	English (US)
Pages (from-to)	97-101
Number of pages	5
Journal	Applied Surface Science
Volume	205
Issue number	1-4
DOIs	https://doi.org/10.1016/S0169-4332(02)01039-5
State	Published - Jan 31 2002

Keywords

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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10.1016/S0169-4332(02)01039-5

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title = "Strontium hafnate phases by anodic spark conversion",

abstract = " 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.",

keywords = "Anodic films, Conversion coatings, Hafnates, Hafnia, Spark conversion",

author = "Schreckenbach, {Joachim P.} and N. Meyer and G. Marx and Lee, {B. T.} and Kriven, {W. M.}",

note = "Funding Information: The support of this work by the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged.",

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doi = "10.1016/S0169-4332(02)01039-5",

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AU - Schreckenbach, Joachim P.

AU - Meyer, N.

AU - Marx, G.

AU - Lee, B. T.

AU - Kriven, W. M.

N1 - Funding Information: The support of this work by the Deutsche Forschungsgemeinschaft (DFG) is gratefully acknowledged.

PY - 2002/1/31

Y1 - 2002/1/31

N2 - 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.

AB - 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.

KW - Anodic films

KW - Conversion coatings

KW - Hafnates

KW - Hafnia

KW - Spark conversion

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U2 - 10.1016/S0169-4332(02)01039-5

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JO - Applied Surface Science

JF - Applied Surface Science

IS - 1-4

ER -

Strontium hafnate phases by anodic spark conversion

Abstract

Keywords

ASJC Scopus subject areas

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