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Title: Radiation damage effects in ferroelectric LiTaO

Abstract

Z-cut lithium tantalate (LiTaO{sub 3}) ferroelectric single crystals were irradiated with 200 keV Ar{sup ++} ions. LiTaO{sub 3} possesses a structure that is a derivative of the corundum (Al{sub 2}O{sub 3}) 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 x 10{sup 18} Ar{sup 2+} ions/m{sup 2} was sufficient to amorphize the irradiated volume of a LiTaO{sub 3} crystal at an irradiation temperature of approximately 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. The authors also observed that the c{sup {minus}} end of the ferroelectric polarization exhibits slightly higher ion dechanneling along with an apparent greater susceptibility to radiation damage, as compared to the c{sup +} end of the polarization.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Los Alamos National Lab., Los Alamos, NM (US)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
756994
Report Number(s):
LA-UR-99-1140
TRN: US0003668
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Materials Research Society Symposium, No location supplied, No date supplied; Other Information: PBD: 4 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LITHIUM OXIDES; TANTALUM OXIDES; ARGON IONS; CRYSTAL STRUCTURE; RADIATION EFFECTS; ION CHANNELING; PHASE TRANSFORMATIONS; AMORPHOUS STATE; FERROELECTRIC MATERIALS

Citation Formats

Wetteland, C.J., Sickafus, K.E., Gopalan, V., Mitchell, J.N., Hartmann, T., Nastasi, M., and Maggiore, C.J. Radiation damage effects in ferroelectric LiTaO. United States: N. p., 1999. Web.
Wetteland, C.J., Sickafus, K.E., Gopalan, V., Mitchell, J.N., Hartmann, T., Nastasi, M., & Maggiore, C.J. Radiation damage effects in ferroelectric LiTaO. United States.
Wetteland, C.J., Sickafus, K.E., Gopalan, V., Mitchell, J.N., Hartmann, T., Nastasi, M., and Maggiore, C.J. Wed . "Radiation damage effects in ferroelectric LiTaO". United States. https://www.osti.gov/servlets/purl/756994.
@article{osti_756994,
title = {Radiation damage effects in ferroelectric LiTaO},
author = {Wetteland, C.J. and Sickafus, K.E. and Gopalan, V. and Mitchell, J.N. and Hartmann, T. and Nastasi, M. and Maggiore, C.J.},
abstractNote = {Z-cut lithium tantalate (LiTaO{sub 3}) ferroelectric single crystals were irradiated with 200 keV Ar{sup ++} ions. LiTaO{sub 3} possesses a structure that is a derivative of the corundum (Al{sub 2}O{sub 3}) 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 x 10{sup 18} Ar{sup 2+} ions/m{sup 2} was sufficient to amorphize the irradiated volume of a LiTaO{sub 3} crystal at an irradiation temperature of approximately 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. The authors also observed that the c{sup {minus}} end of the ferroelectric polarization exhibits slightly higher ion dechanneling along with an apparent greater susceptibility to radiation damage, as compared to the c{sup +} end of the polarization.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {8}
}

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