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Copper Oxide Precipitates in NBS Standard Reference Material 482.

Eric S Windsor1, Robert A Carlton2, Greg Gillen1

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-8371.

Journal of Research of the National Institute of Standards and Technology
|July 23, 2016
PubMed
Summary
This summary is machine-generated.

Copper oxide precipitates were found in a standard reference material (SRM 482), indicating heterogeneity. While small, these oxides may affect some microanalysis techniques.

Keywords:
NBS Standard Reference Material 482copper-gold alloyelectron probe microanalysismetallographyoxide inclusionssample preparationsecondary ion mass spectrometry

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Area of Science:

  • Materials Science
  • Analytical Chemistry
  • Metallurgy

Background:

  • Standard Reference Materials (SRMs) are crucial for accurate measurements.
  • NBS Standard Reference Material (SRM) 482 is a gold-copper alloy certified for homogeneity.
  • Previous characterization did not identify significant heterogeneity at the micrometer scale.

Purpose of the Study:

  • To investigate the presence and nature of heterogeneity in SRM 482.
  • To determine the impact of observed heterogeneity on the material's use as a standard.
  • To characterize the composition and size of oxide precipitates.

Main Methods:

  • Light microscopy
  • Electron microscopy
  • Secondary Ion Mass Spectrometry (SIMS)
  • Electron Probe Microanalysis (EPMA)

Main Results:

  • Copper oxide precipitates were detected in copper-containing alloys of SRM 482.
  • Precipitate size varied with alloy composition, up to 2 μm in the Au20-Cu80 alloy.
  • SIMS confirmed precipitates in all copper-containing wires; EPMA detected and analyzed precipitate composition, revealing differences from the bulk alloy.

Conclusions:

  • SRM 482 exhibits micrometer-scale heterogeneity due to copper oxide precipitates.
  • The low percentage and small size of precipitates minimally impact standard use for basic EPMA.
  • Heterogeneity may limit applicability for automated EPMA and other microanalysis techniques.