The production and characterization of NBS K-411 glass microspheres in the 3-40 um range for certification as a NIST Standard Reference Material (SRM) are described. EDS quantitative analysis and heterogeneity evaluations of the microspheres were made with an EPMA automated particle analysis procedure. Results for the trimmed and normalized compositions produced mean compositions for the elements Mg, Si, Ca, Fe, and O (determined by stoichiometry) that are in good agreement with the certified values for the K-411 bulk glass (NBS SRM 470 Glasses for Mineral Analysis), but with uncertainties about twice as large. Differences from the bulk are attributable to microsphere geometry and size effects.
Citation: Microscopy and Microanalysis
Issue: No. 6
Pub Type: Journals
automated EPMA particle analysis, certification of microsphere standards, K-411 glass microsphere standards