@article{2a7d6404115943ceb4e3c1555c70a211,
title = "Atom-probe tomography and transmission electron microscopy of the kamacite–taenite interface in the fast-cooled Bristol IVA iron meteorite",
abstract = "We report the first combined atom-probe tomography (APT) and transmission electron microscopy (TEM) study of a kamacite–tetrataenite (K–T) interface region within an iron meteorite, Bristol (IVA). Ten APT nanotips were prepared from the K–T interface with focused ion beam scanning electron microscopy (FIB-SEM) and then studied using TEM followed by APT. Near the K-T interface, we found 3.8 ± 0.5 wt% Ni in kamacite and 53.4 ± 0.5 wt% Ni in tetrataenite. High-Ni precipitate regions of the cloudy zone (CZ) have 50.4 ± 0.8 wt% Ni. A region near the CZ and martensite interface has <10 nm sized Ni-rich precipitates with 38.4 ± 0.7 wt% Ni present within a low-Ni matrix having 25.5 ± 0.6 wt% Ni. We found that Cu is predominantly concentrated in tetrataenite, whereas Co, P, and Cr are concentrated in kamacite. Phosphorus is preferentially concentrated along the K-T interface. This study is the first precise measurement of the phase composition at high spatial resolution and in 3-D of the K-T interface region in a IVA iron meteorite and furthers our knowledge of the phase composition changes in a fast-cooled iron meteorite below 400 °C. We demonstrate that APT in conjunction with TEM is a useful approach to study the major, minor, and trace elemental composition of nanoscale features within fast-cooled iron meteorites.",
author = "Rout, {Surya S.} and Heck, {Philipp R.} and Dieter Isheim and Thomas Stephan and Zaluzec, {Nestor J.} and Miller, {Dean J.} and Davis, {Andrew M.} and Seidman, {David N.}",
note = "Funding Information: The authors thank T. Jull and an anonymous reviewer for constructive comments that helped improve the manuscript. PRH acknowledges the Tawani Foundation for a major grant and W. Ganz III for additional funding. This work was supported by NASA through grants NNX09AG39G and NNX15AF78G (TS, AMD). We thank Levke K{\"o}{\"o}p for help with the WDS analyses. The authors acknowledge Sung-Il Baik for providing electropolished grids and for helpful discussions and Betty Strack for maintaining the SEM Laboratory at the Field Museum. The atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The local-electrode atom-probe tomograph at NUCAPT was acquired and upgraded with equipment grants from the MRI program of the National Science Foundation (NSF DMR-0420532) and the DURIP program of the Office of Naval Research (N00014-0400798, N00014-0610539, N00014-0910781). NUCAPT received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center, the SHyNE Resource (NSF NNCI-1542205), and the Initiative for Sustainability and Energy at Northwestern (ISEN). This research was conducted in part in the Center for Nanoscale Materials of Argonne National Laboratory, a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility under Contract No. DE-AC02-06CH11357. Funding Information: Acknowledgments—The authors thank T. Jull and an anonymous reviewer for constructive comments that helped improve the manuscript. PRH acknowledges the Tawani Foundation for a major grant and W. Ganz III for additional funding. This work was supported by NASA through grants NNX09AG39G and NNX15AF78G (TS, AMD). We thank Levke Ko€o€p for help with the WDS analyses. The authors acknowledge Sung-Il Baik for providing electropolished grids and for helpful discussions and Betty Strack for maintaining the SEM Laboratory at the Field Museum. The atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). The local-electrode atom-probe tomograph at NUCAPT was acquired and upgraded with equipment grants from the MRI program of the National Science Foundation (NSF DMR-0420532) and the DURIP program of the Office of Naval Research (N00014-0400798, N00014-0610539, N00014-0910781). NUCAPT received support from the MRSEC program (NSF DMR-1121262) at the Materials Research Center, the SHyNE Resource (NSF NNCI-1542205), and the Initiative for Sustainability and Energy at Northwestern (ISEN). This research was conducted in part in the Center for Nanoscale Materials of Argonne National Laboratory, a U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences User Facility under Contract No. DE-AC02-06CH11357. Publisher Copyright: {\textcopyright} The Meteoritical Society, 2017.",
year = "2017",
month = dec,
doi = "10.1111/maps.12988",
language = "English (US)",
volume = "52",
pages = "2707--2729",
journal = "Meteoritics and Planetary Science",
issn = "1086-9379",
publisher = "The University of Arkansas Press",
number = "12",
}