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