Beryllium Analyses by Secondary Ion Mass Spectrometry

Hervig, R. L.

doi:10.2138/rmg.2002.50.8

Cited by 7 publications

(5 citation statements)

References 34 publications

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“…Ions of the sample material are knocked off the surface of the sample by the oxygen ion beam and drawn into a mass spectrometer, which then sorts the ions according to their atomic weight and charge. Once sorted, the ions are counted, and the counts are converted into a quantitative analysis of the sample (for more information, see Hervig, 2002). Figure A-1 shows a SIMS instrument in operation.…”

Section: Introductionmentioning

confidence: 99%

Beryllium Diffusion of Ruby and Sapphire

Emmett¹,

Scarratt²,

McClure³

et al. 2003

Gems & Gemology

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Over the past two years, the heat treatment of corundum involving lattice diffusion of beryllium (Be) at temperatures over 1800°C has become a major issue in the gem trade. Although initially only orange to orangy pink ("padparadscha"-like) sapphires were seen, it is now known that a full range of corundum colors, including yellow and blue as well as ruby, have been produced or altered by this treatment. An extension of the current understanding of the causes of color in corundum is presented to help explain the color modifications induced by Be diffusion. Empirical support is provided by Bediffusion experiments conducted on corundum from various geographic sources. Examination of hundreds of rough and faceted Be-diffused sapphires revealed that standard gemological testing will identify many of these treated corundums, although in some instances costly chemical analysis by mass spectrometry is required. Potential new methods are being investigated to provide additional identification aids, as major laboratories develop special nomenclature for describing this treatment.

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Section: Introductionmentioning

confidence: 99%

Beryllium Diffusion of Ruby and Sapphire

Emmett¹,

Scarratt²,

McClure³

et al. 2003

Gems & Gemology

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“…() found no measurable matrix effects for the analysis of B concentrations or isotopic compositions in ten synthetic glass samples ranging over a factor of 10 5 in B/SiO 2 . Similarly, Hervig () found no significant matrix effects for Be/Si for a wide variety of silicate glasses and minerals with Be/Si concentrations ranging over a factor of 10 5 .…”

Section: Matrix Effects In Sims Analysismentioning

confidence: 96%

Ion Implants as Matrix‐Appropriate Calibrators for Geochemical Ion Probe Analyses

Burnett

Jurewicz

Woolum

et al. 2015

Geostandard Geoanalytic Res

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For convenience, manuscript Figure 2 is attached below.The profile in Figure 2 was measured with the Caltech Cameca 7f instrument using conventional semiconductor-industry depth-profiling techniques (e.g., Wilson et al. 1989, manuscript Table 1). In order to minimise (1) effects of surface contamination and (2) distortion of the implant depth profile, the primary ( 16 O -) ion beam was rastered over 100 microns.(1) SIMS primary ion current densities are inhomogeneous; consequently, without rastering, even with a field aperture and electronic gating, the tails of the beam incident on a highly contaminated surface outside of the sputter crater can contribute to the measured counting rate because the Cameca ion optics, although good, are not perfect.The efficiency of these contributions is low, but all potential contamination signal levels are frequently orders of magnitude higher than those from the implant. The rastered beam cleans the surface adjacent to the analysed area greatly reducing contamination contributions. (2) After sputtering with an unrastered beam, e.g., at the peak of the implant depth profile, the high intensity core of the beam will be deeper than the lower intensity margins. For nominal depths beyond the peak, counts will still be coming from the peak due to the tails of the beam incident on the walls of the crater, causing significant distortions of the depth profile, distortions which can be avoided by rastering the beam. Normally, raster sizes less than 75 µm are required for depth profiling in insulators to avoid excessive charging; however, a somewhat larger raster appears to have

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“…Secondary ion mass spectrometry (SIMS) (Arizona State University SIMS Facility, Tempe, AZ, USA) was used to characterize the content and isotopic composition of B in the clay minerals. Analytical protocols for measurement of B contents and δ 11 B values have been described elsewhere [49,[66][67][68] and particularly for measurements of clay minerals by [24].…”

Section: Secondary Ion Mass Spectrometrymentioning

confidence: 99%

“…Primary beam currents below 10 nA were used with beam diameters defocused to 40-60 µm. Positive secondary ions were accelerated away from the sample, and energy filtering (−75 V sample offset) was used for measurements of B-content [66]. No energy filtering was used for isotope ratio measurements.…”

Section: Boron Content and Isotope Analysismentioning

confidence: 99%

Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

et al. 2020

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Clay dehydration at great depth generates fluids and overpressures in organic-rich sediments that can release isotopically light boron from mature organic matter, producing 10B-rich fluids. The B can be incorporated into the tetrahedral sites of authigenic illite during the illitization of smectite. Therefore, the crystal-chemical and geochemical characterization of illite, smectite or interlayered illite–smectite clay minerals can be an indicator of depth (temperature) and reactions with the basin fluids. The aim of this study was to determine the detailed clay mineralogy, B-content and isotopic composition in illite–smectite rich samples of mud volcanoes from the Gulf of Cádiz, in order to evaluate interactions of hydrocarbon-rich fluids with clays. Molecular modeling of the illite structure was performed, using electron density functional theory (DFT) methods to examine the phenomenon of B incorporation into illite at the atomic level. We found that it is energetically preferable for B to reside in the tetrahedral sites replacing Si atoms than in the interlayer of expandable clays. The B abundances in this study are high and consistent with previous results of B data on interstitial fluids, suggesting that hydrocarbon-related fluids approaching temperatures of methane generation (150 °C) are the likely source of B-rich illite in the studied samples.

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Beryllium Analyses by Secondary Ion Mass Spectrometry

Cited by 7 publications

References 34 publications

Beryllium Diffusion of Ruby and Sapphire

Beryllium Diffusion of Ruby and Sapphire

Ion Implants as Matrix‐Appropriate Calibrators for Geochemical Ion Probe Analyses

Evidence of Hydrocarbon-Rich Fluid Interaction with Clays: Clay Mineralogy and Boron Isotope Data from Gulf of Cádiz Mud Volcano Sediments

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