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Characterization of fluor-chlorapatites by electron probe microanalysis with a focus on time-dependent intensity variation of halogens
-
Beth Goldoff
,
James D. Webster
Published/Copyright:
April 2, 2015
Abstract
Prior research has shown that fluorine and chlorine X-ray count rates vary with exposure to the electron beam during electron probe microanalysis (EPMA) of apatite. Stormer et al. (1993) and Stormer and Pierson (1993) demonstrate that the EPMA-operating conditions affect the halogen intensities in F-rich natural Durango and Wilberforce apatites and in a Cl-rich apatite. Following these studies, we investigated the effects of operating conditions on time-dependent X-ray intensity variations of F and Cl in a broad range of anhydrous fluor-chlorapatites. We tested 7, 10, and 15 kV accelerating voltages; 4, 10, and 15 nA beam currents; 2, 5, and 10 μm diameter fixed spot sizes; and the influence of 2 distinct crystal orientations under the electron beam. We find that the halogen X-ray intensity variations fluctuate strongly with operating conditions and the bulk F and Cl contents of apatite. We determined the optimal EPMA operating conditions for these anhydrous fluor-chlorapatites to be: 10 kV accelerating voltage, 4 nA beam current (measured at the Faraday cup), 10 μm diameter fixed spot, and the apatite crystals oriented with their c-axes perpendicular to the incident electron beam. This EPMA technique was tested on a suite of 19 synthetic anhydrous apatites that covers the fluorapatite-chlorapatite solid-solution series. The results of these analyses are highly accurate; the F and Cl EPMA data agree extremely well with wet-chemical analyses and have an R2 value >0.99.
Keywords : Fluorapatite; chlorapatite; fluor-chlorapatite; EPMA measurement; fluorine; chlorine; Durango fluorapatite
Received: 2011-2-21
Accepted: 2012-3-19
Published Online: 2015-4-2
Published in Print: 2012-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Fluorapatite;
chlorapatite;
fluor-chlorapatite;
EPMA measurement;
fluorine;
chlorine;
Durango fluorapatite
Articles in the same Issue
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- Vertical zonation of the Barcroft granodiorite, White Mountains, California: Implications for magmatic processes
- Minerals in cement chemistry: A single-crystal neutron diffraction and Raman spectroscopic study of thaumasite, Ca3Si(OH)6(CO3)(SO4)·12H2O
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