Materials Applications - RBNI. Kelly 2.pdf · Diffraction adds atomic structure + Atom probe...
Transcript of Materials Applications - RBNI. Kelly 2.pdf · Diffraction adds atomic structure + Atom probe...
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Materials Applications
of Atom Probe Tomography
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Metals
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Correlative Microscopy & Characterization
40
0n
m• C. Stallybrass, G. Sauthoff, A. Schneider, and Y. Degas, Max Planck Institut fur
Eisenforschung-Düsseldorf
FeCr
NiAl
LEAP Tomographs (Fe)TEM Dark-field Images
Iron-base superalloy
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100 nm
APT Provides 3D Analysis
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There is a lot of 3D detail
50 nm
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Grain Boundary Analysis
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200 nm
• Final tip shape:
grain boundary no
longer visible.
Grain boundary visibility
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SE/BSE Contrast
■ Without TKD, targeting an ROI can be difficult
■ During final tip shaping, often channeling contrast is lost
?
• Mounted wedge prior to
sharpening.
• Precipitates visible at the
interface.
• Grain boundary is clearly
visible.
1 µm
EBSD Map
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TKD During APT Specimen Preparation
▪ TKD can be combined with atom probe to provide
crystallographic information
▪ It is quick and easy in the FIB/SEM without needing
to move the specimen from the milling position
t-EBSD angle
FIB angle
FIB
Stage tilt
SEM
EBSD
camera
pretilt
Improved ROI targeting
Segregation
0
10
20
30
40
50
60
0 100 200
(de
gre
es)
Distance (nm)
Composition
Character
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K.P. Rice, R.R. Keller, M.P. Stoykovich, Specimen-thickness effects on
transmission Kikuchi patterns in the scanning electron microscope, Journal
of Microscopy. 254 (2014) 129–136.
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Quantifying Segregation: Interfacial Excess
■ Gibbsian Interfacial Excess is a
measure of the amount of
segregation at a grain boundary,
normalized by area1 (i.e., excess over the concentration in the bulk)
■ This allows a measure of
segregation to be calculated
■ Light elements and heavy
elements can be measured simultaneously
Species level at GB - Species level in matrixInterfacial
excess
Ion Interfacial
Excess
Carbon 34.5 atoms/ nm2
Boron 7.6 atoms/ nm2
=Sampling area
Hellman, O.C., Seidman, D.N., 2002. Measurement of the Gibbsian interfacial
excess of solute at an interface of arbitrary geometry using three-dimensional
atom probe microscopy. Materials Science and Engineering: A 327, 24–28.
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Materials Applications
Nanowires and Nanoparticles
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Specimen Preparation - Encapsulation
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APT of Pt Nanoparticles
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0
20
40
60
80
100
-4 -3 -2 -1 0 1
Zn
:O R
ati
o
Co
ncen
trati
on
(at.
%)
Distance (nm)
ZnAlOPtZn:O
Zn+O+Al
40at.% Pt
Proxigram Analysis [1]
[1] O. Hellman et al., Micro. Microanal. 6 (2000) 437.
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CoCuMn Catalyst Particle
• Co• Cu• Mn• O
10 nm thick section5 nm thick section
Xiang et al. J. Am. Chem. Soc., 2013, 135 (19), pp
7114–7117.
2 nm
4 nm
Motivation
• -High efficiency production
of Long-Chain Terminal
Alcohols
• a Co-rich core structure
and a Cu-dominated
CoCuMn mixed shell that is
highly effective in enabling
chain lengthening with
terminal alcohol or olefin
production
• Sample Preparation was
eBeam deposited Pt• Images are sections through 3D tomographic reconstructions
• Faceted core-shell structure that contain intra-core clusters
• Oxygen was distributed throughout the core-shell interface
• Surface contains a high concentration of Cu and Mn
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Nanowires: P-Doped VLS Germanium
■ Phosphorous-doped germanium nanowire
grown with a gold nanoparticle2
■ The doping rate is determined by the rate at
which the dopant atoms move from the gas
phase as precursors to the solid phase as
substitutional impurities
■ Quantitative analysis of the mass
spectrum showed that the dopant
concentration in the vapor-liquid-solid-
grown nanowire was much less than that
of the gas phase
Gold
catalyst
Au
Ge
P
Planes normal to the <111> growth direction
Lateral variation in dopant concentration
1. Lauhon, L. J., MRS Bull. 2009, 34, 738-743.
2. Perea, D. E., Nature Nanotech. 2009, 315-319
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Materials Applications
Geological Materials
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New Review of APT in Geoscience
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Geochronology and Life on Earth
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Life on Earth
Andrée Valley1 Ga = 1000 Ma
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Solar System
condensed about
4.56 Ga
1952 2006
Which View is Correct?
Wilde, S.A., Valley, J.W., Peck, W.H. & Graham,
C.M., Evidence from detrital zircons for the
existence of continental crust and oceans on
the Earth 4.4 Gyr ago, Nature 409,175–178
(2001).
4.0-4.4 Ga:
Hadean Earth vs.
Cool Early Earth?
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U-Pb Geochronology in Zircon
▪ When zircons solidify, all Pb segregates to the liquid: (zero Pb in crystal)
▪ U is typically found at about 500 appm in crystal
▪ Pb is the final daughter product of both 235U and 238U
▪ Any Pb in zircon is radiogenic from U decay
▪ Thus, there are two “clocks”
▪ If both clocks give same date, it is concordant which is imbues confidence
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A. Strickland et al. (2011) AJS
Concordant
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Vipont granodiorite, Grouse Creek Mts, UT
Albion, Raft River, Grouse Creek Mts
A. Strickland et al. (2011) AJS
2542 Ma
29 Ma
Core = 2542 Ma Rim = 29 Ma
97% concordantU 672 ppm Th 224 ppm
Geo Chronometry: APT vs. SIMS
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Atom Probe gets same dates as SIMS
Atom Probe
SIMS
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Utsunomiya et al. 2004
a-recoil damage produces defects
5.6 wt.% Pb
HAADF-STEM
EDX231Th recoil
Geisler et al. 2007
2 α’s
10 nm
Weber et al. 1994
Ewing et al. 2003
5 nm
α-Recoil Damage in Zircon
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Pb segregation to defects
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Jack Hills 4.4 Ga:
Oldest Mineral Known?
A
B
C
Cathodoluminescence image
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R52_126859
10
23
nm 10
0 n
m
Y
Pb
YPb Y & Pb
207Pb
206Pb
20
nm
10
0 n
m
20
nm
Pb and Y Segregate to Defects
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APT Data Tell a New Story
10
0 n
m
YMatrix+ Clusters
4.4 Ga
Matrix
3.4 Ga
Pb/U ratios are unphysical for
radiogenesis
■ Prior SIMS data are substantiated
■ APT data reveal new history of zircon
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Y & Pb
207Pb
206Pb
20
nm
20
nm
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Cool Early Earth
Previous SIMS-based
conjecture of cool early
earth is affirmed
Atom Probe Tomography -
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Did life have a chance to
start during Hadean Age?
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Beyoncé Tweet on Blue Zircon
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Progress toward
Hydrogen Mapping in APT
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Hydrogen in APT Mass Spectra
What is the material?
H H2
Almost all APT spectra contain hydrogen
– it is a residual gas in the vacuum system.
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Hydrogen in APT Mass Spectra – Pure Si
Silicon wafers are VERY pure, they DON’T contain Hydrogen
Hydrogen comes from the vacuum system
This diminishes the quality of quantification for any true hydrogen
Mass-to-Charge-State Ratio (Da)
H, H2
H ~ 0.5%
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The Hydrogen Challenge for APT
▪ Residual gas in a vacuum system is 90% H2
▪ H2 is a difficult gas to pump
▪ H2 outgasses from the steel chamber
▪ Hydrogen in the analysis chamber leads to:
▪ H composition measurement: not quantitative
▪ Formation of hydrides which leads to mass interferences
▪ AlH+/Si+ @28Da
▪ SiH+/P+ @31Da ….
▪ Biological Samples: CnHmx+
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Materials Applications
Hydrogen Mapping
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Analysis of Hydrides in Hydrogen-Disporportionated Fe-Nd-B Powder
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Sepehri-Amin H, Ohkubo T, Nishiuchi T, Hirosawa S, Hono K. 2011. Quantitative laser atom probe
analyses of hydrogenation-disproportionated Nd-Fe-B powders. Ultramicroscopy 111:615-618.
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APT Atom Maps of Fe-Nd-B Powder
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Sepehri-Amin H, Ohkubo T, Nishiuchi T, Hirosawa S, Hono K. 2011. Quantitative laser atom probe
analyses of hydrogenation-disproportionated Nd-Fe-B powders. Ultramicroscopy 111:615-618.
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Composition Profile through NdH2 Precipitate
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Sepehri-Amin H, Ohkubo T, Nishiuchi T, Hirosawa S, Hono K. 2011. Quantitative laser atom probe
analyses of hydrogenation-disproportionated Nd-Fe-B powders. Ultramicroscopy 111:615-618.
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Cooperative APT and (S)TEM
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Correlative TEM and APT of Complexions
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Atomic-Scale Analytical Tomography
■ (S)TEM tomography
■ Full (S)TEM imaging modes
■ Needle-shaped specimens
■ No missing wedge
■ EDS adds compositional information
■ EELS adds chemical sensitivity
■ Diffraction adds atomic structure
+■ Atom probe tomography provides
3D atom positions
■ Single atom analytical sensitivity
■ 0.2 nm spatial resolution in 3D
■ Cryo specimen stage (20K)
+
Atom Probe Tomography
Analytical Tomography
“Atomic-Scale Tomography: A 2020 Vision”
Thomas F. Kelly, Michael K. Miller, Krishna Rajan, and
Simon P. Ringer, Microscopy and Microanalysis,
Invited Review, vol. 19 (2013) pp. 652 – 664.
“Atomic-Scale Analytical Tomography”
Thomas F. Kelly, Microscopy and Microanalysis, vol.
23 (2017) pp. 34-45.
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Illustration of Correlative Imaging Potential
▪ Ni-base Superalloy
▪ TKD mapping of atom
probe specimen
▪ Grain Boundary character
▪ EELS spectra from grain
boundary?
▪ What effect does B
have on grain
boundary chemistry?
100 nm
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ATOM Project and Project Tomo
Collaborators
ATOM Project: Michael Miller, Krishna Rajan, Simon Ringer, Brian Gorman, Ondrej Krivanek and Niklas Dellby
Project Tomo: Rafal Dunin-Borkowski, Joachim Mayer, Dierk Raabe, Max Haider
Project Tomo:
TEM+LEAP
ATOM Project:
STEM+LEAP
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Build objective lens assembly with
atom probe inside
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Atom Probe Tomography -
ASAT
AST Objectives:
• 100% of atoms detected
• High precision for atom positions
• Use TEM to correct trajectory aberrations of atom probe
ASAT
Properties
Structure-Properties
Microscopy
EELS
Atomic Structure
Electronic Structure
+
EDS
DiffractionAtom Probe (S)TEM
+ +
AST
CMSE
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