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• W2108232562 abstract "Other| October 01, 1996 Optimizing the electron microprobe analysis of hydrous alkali aluminosilicate glasses George B. Morgan; George B. Morgan University of Oklahoma, Electron Microprobe Laboratory, Norman, OK, United States Search for other works by this author on: GSW Google Scholar David London David London Search for other works by this author on: GSW Google Scholar American Mineralogist (1996) 81 (9-10): 1176–1185. https://doi.org/10.2138/am-1996-9-1016 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation George B. Morgan, David London; Optimizing the electron microprobe analysis of hydrous alkali aluminosilicate glasses. American Mineralogist 1996;; 81 (9-10): 1176–1185. doi: https://doi.org/10.2138/am-1996-9-1016 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract The time-dependent loss of NaKα X-ray intensity during electron-beam irradiation of hydrous alkali aluminosilicate glasses is apparently more significant during the initial few seconds of beam exposure than it is for anhydrous glasses, and it is pronounced for incident beam currents >2-5 nA (using 15-20 μm beam diameters). Exponential fits of NaKα intensity vs. time show a progressive decrease in the apparent zero-time intercepts for incident beams from 2 to 20 nA, and thus methods for correcting Na concentrations solely on the basis of curve fitting and extrapolation to zero-time values may underestimate Na contents by almost 10% (relative) for higher beam currents. Similar exponential fits to the intensity-time data for AlKα and SiKα show that “grow-in” is greater for Al than for Si. For incident currents ≥ 5 nA, the magnitudes of all intensity changes also increase with total H2O content of glass. On the basis of these observations, the optimal conditions for analysis of hydrous alkali aluminosilicate glasses include a 2 nA beam with 20 μm diameter and counting times of 20-40 s for the analysis of alkali aluminosilicate components, with Na and Al analyzed first (simultaneously, if possible). These methods minimize Na loss and grow-in for Al and Si to the point that little or no correction is needed, provide good statistical accuracy, and work with a wide variety of standard materials (i.e., glass standards with compositions and H2O contents comparable to the unknowns are not needed). For complete analysis of more complex multicomponent systems, two beam conditions are recommended: an initial 2 nA, 20 μm diameter beam for analysis of alkali aluminosilicate components, followed by a 20 nA, 20 μm diameter beam for analysis of all other components. With the use of these methods, the H2O contents of hydrous glasses (H2O as the only unknown) can be determined by difference with uncertainties mostly <5% (relative to FTIR values) for glasses containing up to 10 wt% H2O. At beam currents >5 nA, corrections for Na loss ignoring Al (and Si) grow-in underestimate H2O contents by about 10-50% of concentration. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2108232562 title "Optimizing the electron microprobe analysis of hydrous alkali aluminosilicate glasses" @default.
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