Ion tracks and microstructures in barium titanate irradiated with swift heavy ions: A combined experimental and computational study

W. Jiang, R. Devanathan, C. J. Sundgren, M. Ishimaru, K. Sato, T. Varga, S. Manandhar, A. Benyagoub

研究成果: Article査読

15 被引用数 (Scopus)

抄録

Tetragonally structured barium titanate (BaTiO3) single crystals were irradiated using 635 MeV 238U+ ions to fluences of 1 × 107, 5 × 1010 and 1.4 × 10 12 ions cm-2 at room temperature. Irradiated samples were characterized using ion channeling, X-ray diffraction, helium ion microscopy and transmission electron microscopy. The results show that the ion-entry spot on the surface has an amorphous core of up to ∼10 nm in diameter, surrounded by a strained lattice structure. Satellite-like defects around smaller cores are also observed and are attributed to the imperfect epitaxial recrystallization of thermal-spike-induced amorphization. The critical value of the electronic stopping power for creating observable amorphous cores is determined to be ∼22 keV nm-1. Molecular dynamics simulations show an amorphous track of ∼1.2 nm in radius under thermal energy deposition at 5 keV nm -1; the radius increases to ∼4.5 nm at 20 keV nm-1. A linear fit of the core diameter as a function of the square root of the energy deposition rate suggests a reduction in the diameter by an average of ∼8.4 nm due to thermal recrystallization if electron-phonon coupling efficiency of 100% is assumed. The simulation also reveals details of the bonding environments and shows different densities of the amorphous zones produced at different energy deposition rates.

本文言語English
ページ(範囲)7904-7916
ページ数13
ジャーナルActa Materialia
61
20
DOI
出版ステータスPublished - 2013 12月

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • セラミックおよび複合材料
  • ポリマーおよびプラスチック
  • 金属および合金

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