Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

Q. Jeangros; Thomas Willum Hansen; Jakob Birkedal Wagner; Rafal E. Dunin-Borkowski; C. Hébert; J. Van Herle; A. Hessler-Wyser

doi:10.1016/j.actamat.2013.12.035

Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

Q. Jeangros, Thomas Willum Hansen, Jakob Birkedal Wagner, Rafal E. Dunin-Borkowski, C. Hébert, J. Van Herle, A. Hessler-Wyser

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O2 between ambient temperature and 600°C. Several different transmission electron microscopy imaging techniques, electron diffraction and electron energy-loss spectroscopy were used to study the evolution of the microstructure and the local chemical composition of the particles during oxidation. Our results suggest that built-in field effects control the initial stages of oxidation, with randomly oriented NiO crystallites and internal voids then forming as a result of outward diffusion of Ni2+ along NiO grain boundaries, self-diffusion of Ni2+ ions and vacancies, growth of NiO grains and nucleation of voids at Ni/NiO interfaces. We also observed the formation of transverse cracks in a growing NiO film in situ in the electron microscope.

Original language	English
Journal	Acta Materialia
Volume	67
Pages (from-to)	362-372
ISSN	1359-6454
DOIs	https://doi.org/10.1016/j.actamat.2013.12.035
Publication status	Published - 2014

Keywords

In situ transmission electron microscopy (TEM)
Electron energy-loss spectroscopy
Oxidation
Kinetics
Diffusion

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@article{b3d86523bdb44140916d46d9c8f3f1be,

title = "Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope",

abstract = "The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O2 between ambient temperature and 600°C. Several different transmission electron microscopy imaging techniques, electron diffraction and electron energy-loss spectroscopy were used to study the evolution of the microstructure and the local chemical composition of the particles during oxidation. Our results suggest that built-in field effects control the initial stages of oxidation, with randomly oriented NiO crystallites and internal voids then forming as a result of outward diffusion of Ni2+ along NiO grain boundaries, self-diffusion of Ni2+ ions and vacancies, growth of NiO grains and nucleation of voids at Ni/NiO interfaces. We also observed the formation of transverse cracks in a growing NiO film in situ in the electron microscope.",

keywords = "In situ transmission electron microscopy (TEM), Electron energy-loss spectroscopy, Oxidation, Kinetics, Diffusion",

author = "Q. Jeangros and Hansen, {Thomas Willum} and Wagner, {Jakob Birkedal} and Dunin-Borkowski, {Rafal E.} and C. H{\'e}bert and {Van Herle}, J. and A. Hessler-Wyser",

year = "2014",

doi = "10.1016/j.actamat.2013.12.035",

language = "English",

volume = "67",

pages = "362--372",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Pergamon Press",

}

Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope. / Jeangros, Q.; Hansen, Thomas Willum ; Wagner, Jakob Birkedal; Dunin-Borkowski, Rafal E.; Hébert, C.; Van Herle, J.; Hessler-Wyser, A.

In: Acta Materialia, Vol. 67, 2014, p. 362-372.

Research output: Contribution to journal › Journal article › Research › peer-review

TY - JOUR

T1 - Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

AU - Jeangros, Q.

AU - Hansen, Thomas Willum

AU - Wagner, Jakob Birkedal

AU - Dunin-Borkowski, Rafal E.

AU - Hébert, C.

AU - Van Herle, J.

AU - Hessler-Wyser, A.

PY - 2014

Y1 - 2014

N2 - The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O2 between ambient temperature and 600°C. Several different transmission electron microscopy imaging techniques, electron diffraction and electron energy-loss spectroscopy were used to study the evolution of the microstructure and the local chemical composition of the particles during oxidation. Our results suggest that built-in field effects control the initial stages of oxidation, with randomly oriented NiO crystallites and internal voids then forming as a result of outward diffusion of Ni2+ along NiO grain boundaries, self-diffusion of Ni2+ ions and vacancies, growth of NiO grains and nucleation of voids at Ni/NiO interfaces. We also observed the formation of transverse cracks in a growing NiO film in situ in the electron microscope.

AB - The oxidation of nickel particles was studied in situ in an environmental transmission electron microscope in 3.2 mbar of O2 between ambient temperature and 600°C. Several different transmission electron microscopy imaging techniques, electron diffraction and electron energy-loss spectroscopy were used to study the evolution of the microstructure and the local chemical composition of the particles during oxidation. Our results suggest that built-in field effects control the initial stages of oxidation, with randomly oriented NiO crystallites and internal voids then forming as a result of outward diffusion of Ni2+ along NiO grain boundaries, self-diffusion of Ni2+ ions and vacancies, growth of NiO grains and nucleation of voids at Ni/NiO interfaces. We also observed the formation of transverse cracks in a growing NiO film in situ in the electron microscope.

KW - In situ transmission electron microscopy (TEM)

KW - Electron energy-loss spectroscopy

KW - Oxidation

KW - Kinetics

KW - Diffusion

U2 - 10.1016/j.actamat.2013.12.035

DO - 10.1016/j.actamat.2013.12.035

M3 - Journal article

VL - 67

SP - 362

EP - 372

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -

Oxidation mechanism of nickel particles studied in an environmental transmission electron microscope

Abstract

Keywords

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