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Lithium nanocluster formation in Li+ - ion implantedMgO

Published online by Cambridge University Press:  17 March 2011

A. van Veen ,
M.A. van Huis ,
A.V. Fedorov ,
H. Schut ,
C.V. Falub ,
S.W.H. Eijt ,
F. Labohm ,
B.J. Kooi  and
J.Th.M. De Hosson
A. van Veen
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
M.A. van Huis
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
A.V. Fedorov
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
H. Schut
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
C.V. Falub
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
S.W.H. Eijt
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
F. Labohm
Affiliation:
Interfaculty Reactor Institute, Delft University of Technology, Mekelweg 15, NL-2629JB, Delft, The Netherlands.
B.J. Kooi
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, 4797 AG Groningen, The Netherlands
J.Th.M. De Hosson
Affiliation:
Materials Science Center, University of Groningen, Nijenborgh 4, 4797 AG Groningen, The Netherlands
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Abstract

Photon absorption (PA), Positron Beam Analysis (PBA) and Neutron DepthProfiling (NDP) is applied to study the relation between photon absorptionbehavior and the precipitates formed by ion implantation and thermalannealing. Monocrystals of MgO(100) were implanted with 1.0×10166Li ions cm−2 at an energy of 30 keV. The samples werethermally annealed in air in steps up to 1200 K. After each step Dopplerbroadening Positron Beam Analysis (PBA) was applied to monitor the depthprofile of the implantation defects. The evolution of the depth profile oflithium was followed with the aid of NDP. During the annealing there ishardly any change in the location of the lithium implantation peak at 150 nm(peak concentration 2 at. %). Only after annealing to 1200 K the majority ofthe lithium has left the crystal and optical absorption effects havedisappeared. During annealing at 750 K an absorption band develops between400 and 600 nm; at 950 K the maximum absorption is centered at 450 nmcorresponding to Mie absorption and scattering by lithium nanoclusters.Positron beam analysis shows a considerable increase of annihilations withlow momentum electrons in the implanted zone. A positron method formeasuring electron momentum distributions (2D-ACAR) coupled to an intensepositron beam gave evidence for the presence of semi-coherent metalliclithium inclusions.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 647: Symposium O – Ion Beam Synthesis & Processing of Advanced Materials , 2000 , O11.24
Copyright
Copyright © Materials Research Society 2001

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