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Cosegregation-Induced Epitaxial Growth of Two- and Three-Dimensional Compounds on Multicomponent Alloy Surfaces

Published online by Cambridge University Press:  10 February 2011

E. Clauberg ,
A. Dziakova ,
B. Eltester ,
L. Hammer ,
B. Hüning ,
M. Kottcke ,
C. Müller ,
C. Rath ,
C. Uebing  and
K. Heinz
E. Clauberg
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Physical Chemistry, D-40074 Düsseldorf, Germany
A. Dziakova
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Physical Chemistry, D-40074 Düsseldorf, Germany
B. Eltester
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Physical Chemistry, D-40074 Düsseldorf, Germany
L. Hammer
Affiliation:
Lehrstuhl für Festkörperphysik, Universitäit Erlangen-Nürnberg, D-910.58 Erlangen, Germany
B. Hüning
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Physical Chemistry, D-40074 Düsseldorf, Germany
M. Kottcke
Affiliation:
Lehrstuhl für Festkörperphysik, Universitäit Erlangen-Nürnberg, D-910.58 Erlangen, Germany
C. Müller
Affiliation:
Lehrstuhl für Festkörperphysik, Universitäit Erlangen-Nürnberg, D-910.58 Erlangen, Germany
C. Rath
Affiliation:
Lehrstuhl für Festkörperphysik, Universitäit Erlangen-Nürnberg, D-910.58 Erlangen, Germany
C. Uebing
Affiliation:
Max-Planck-Institut für Eisenforschung, Department of Physical Chemistry, D-40074 Düsseldorf, Germany
K. Heinz
Affiliation:
Lehrstuhl für Festkörperphysik, Universitäit Erlangen-Nürnberg, D-910.58 Erlangen, Germany
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Abstract

In this contribution the cosegregation-induced epitaxial growth of two- and three-dimensional chromium nitrides on ferritic Fe-15%Cr-N(100) (CN = 30 wt-ppm) single crystal surfaces will be discussed. The two-dimensional CrN surface compound is stable between 600 and 720°C. From the (1 × 1) LEED pattern it is inferred that the surface compound is epitaxial to the bcc(100) alloy surface. XPD and LEED-IV investigations have revealed that this surface compound consists of a single CrN compound layer plus an additional subsurface chromium layer with a huge interlayer expansion between both layers. The CrN surface precipitate formed at temperatures T < 600°C is also epitaxially arranged on the bcc(100) substrate surface. Its structure corresponds to the rocksalt structure, i.e. the structure of the well-known bulk CrN. Starting from a sputter cleaned alloy surface the growth of the epitaxial CrN surface precipitate proceeds via the two-dimensional CrN surface nitride. After completion of this two-dimensional CrN layer the nucleation and growth of the three-dimensional CrN surface precipitate takes place.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 528: Symposia AA – Mechanisms & Principals of Epitaxial Growth in Metallic Systems , 1998 , 3
Copyright
Copyright © Materials Research Society 1998

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