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Radiation Damage Effects in Ferroelectric Litao3 Single Crystals

Published online by Cambridge University Press:  10 February 2011

C. J. Wetteland ,
K. E. Sickafus ,
V. Gopalan ,
J. N. Mitchell ,
T. Hartmann ,
M. Nastasi ,
C. J. Maggiore ,
J. R. Tesmer  and
T. E. Mitchell
C. J. Wetteland
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
K. E. Sickafus
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
V. Gopalan
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
J. N. Mitchell
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
T. Hartmann
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
M. Nastasi
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
C. J. Maggiore
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
J. R. Tesmer
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
T. E. Mitchell
Affiliation:
Los Alamos National Laboratory, Materials Science and Technology, Los Alamos, NM 87545.
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Abstract

Z-cut lithium tantalate (LiTaO3) ferroelectric single crystals were irradiated with 200 keV Art++ ions. LiTaO3 possesses a structure that is a derivative of the corundum (A12O3) crystal structure. A systematic study of the radiation damage accumulation rate as a function of ion dose was performed using ion-beam channeling experiments. An ion fluence of 2.5•1018 Ar2+ ions/m2 was sufficient to amorphize the irradiated volume of a LiTaO3 crystal at an irradiation temperature of ∼120K. This represents a rather exceptional susceptibility to ion-induced amorphization, which may be related to a highly disparate rate of knock-on of constituent lattice ions, due to the large mass difference between the Li and Ta cations. We also observed that the c− end of the ferroelectric polarization exhibits slightly higher ion dechanneling along with an apparent greater susceptibility to radiation damage, as compared to the c+ end of the polarization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 504: Symposium KK – Atomistic Mechanisms in Beam Synthesis & Irradiation… , 1997 , 159
Copyright
Copyright © Materials Research Society 1998

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References

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