Radiation damage effects in ferroelectric LiTaO3 single crystals

C. J. Wetteland, K. E. Sickafus, Venkatraman Gopalan, J. N. Mitchell, T. Hartmann, M. Nastasi, C. J. Maggiore, J. R. Tesmer, T. E. Mitchell

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations

Abstract

Z-cut lithium tantalate (LiTaO3) ferroelectric single crystals were irradiated with 200 keV Ar++ ions. LiTaO3 possesses a structure that is a derivative of the corundum (Al2O3) 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 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. 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.

Original languageEnglish (US)
Pages (from-to)159-164
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume504
StatePublished - Jan 1 1999

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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