FIB applications to high pressure research · 2009-08-30 · FIB applications to high pressure...
Transcript of FIB applications to high pressure research · 2009-08-30 · FIB applications to high pressure...
FIB applications to high pressureresearch
Yingwei FEIGeophysical Lab, Carnegie Institution of Washington
Earth’sInterior
Crust
Upper mantle
Lower mantle
Outer core
Inner core
12,756 kmDiamond cell
Multi-anvil
Piston-cylinder
364 GPa>6000 K
High-pressure sample
2µm
Applications to petrology and mineral physics
Prepare recovered laser-heated DAC sample for chemical analysisusing Focused Ion Beam (FIB)
5µm
FIB-prepared sample for TEM analysis
Mg-pv
Ca-pv
Angele Ricolleau et al [2008]
TEM observation of MORB sample quenched from 44 GPa
Deep-mantle chemistry - Element partitioning in the LHDACnanoSEM X-ray mapping
Ox->Met
Met-> Ox
Met-> Ox
Ox->Met
Ox->Met
Mg Fe NiBSE Si
•SPATIALRESOLUTION:300 (Ni) and 700(Fe) nm lateralspatial resolution at15kV and 700pA
•DETECTION LIMIT:~3000ppm
•REPRESENTATIVEPRECISION:± 2% Ni, ± 13% Pd
•ACCURACY:indistinguishablefrom WDS usingsuites of EMPstandards
Cottrell et al [in prep.]
At low P,ubiquitousdark spotsappear to bevoids
At high P,Si & O richregionsexsolve
NS50L nano SIMS Calibration: suite of Fe80/Ni20 alloys + 1% Co, Mo, W + 1% PGEs & Ni in SC olivine. True sub-μm resolution (no risk of analyzing sub-surface components). D.L. O- beam (ppm): <5 Ni, Co, Ru, Rh, Pd; 18 Re; 50 Mo; 130 Os, Pt; 200 W. Precision 2-35 % (correlative with D.L.s, O-)
20 GPa
60 GPa
SIMS 28Si/56FeBSE nanoSEM EDS EMP WDS
0.2wt% Si
2.5wt% O
3.5wt% Si
4.2wt% O
Metal-silicate interaction at themantle-core boundary
Sakai et al. [2006]
P = 139 Gpa, T = 3000 K
Mg-Fe partitioning in deep mantle
Auzende et al. [2008]
Applications to High-Pressure Physics
•FIB deposition of theplatinum electrodes on thediamond anvils
•Bi-based high Tcsuperconductor with Pt-leads attached by FIB, asprepared for loading anAr medium
Applications to Single Crystal CVD Diamonds
Characterization of CVD Diamond for spectroscopic, diffraction, and microstructural
analysis
Micromachining CVD Diamond for tailoring surfaces and fabricating shapes to
achieve high performance and unique design
Applications to Geochemistry
Recovery of diamond inclusions for chemicaland isotopic analyses
FutureTEM
NanoSIMS
Dia
mond A
nvil
Dia
mond A
nvil
Ruby
Sample
Au
Neon
Meta
l Gasket
Laser-heating DAC
5µm
Synchrotron X-ray
Field emissionmicroprobe
FIB