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STEM EDX Nitrogen Mapping of Nanoinclusions in Milky Diamonds from Juina, Brazil, Using a Windowless Silicon Drift Detector System
journal contribution
posted on 2016-04-29, 00:00 authored by J. Rudloff-Grund, F.E. Brenker, K. Marquardt, F.V. Kaminsky, A. SchreiberEnergy-dispersive
X-ray spectroscopy (EDX) performed using scanning
transmission electron microscopy (STEM) in combination with a windowless
detector setup allows high-resolution imaging and chemical composition
mapping even of light elements present in low concentrations. The
used TEM-system combines a field emission electron source with four
silicon drift detectors allowing for high detection sensitivity. We
used this enhanced system to investigate 20 to 200 nm sized inclusions
in milky diamonds from Rio Soriso, Juina area, Brazil. The diamonds
act as a chemical inert container and therefore protect their inclusions
from further chemical reactions with their surroundings. We visualize
the presence and distribution of nitrogen within focused ion beam
(FIB) slices containing these nanoinclusions. The investigation of
these specific diamonds may open a new window to deeper parts of the
Earth (>660 km) as they represent pristine material of this deep
mantle
environment.
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light elementsdetection sensitivityFIBchemical reactionsdetector setupSTEM EDX Nitrogen Mappingion beamMilky Diamondsinclusionsilicon drift detectorsfield emission electron sourceJuina area200 nmmantle environmentchemical composition mappingscanning transmission electron microscopyRio Sorisodiamonds act
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