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Title: Amorphization and recrystallization of single-crystalline hydrogen titanate nanowires by N{sup +} ion irradiation

We report on the phase transformation of hydrogen titanate (H{sub 2}Ti{sub 3}O{sub 7}) nanowires induced by 50 keV N{sup +} ion irradiation at room temperature with fluences of 1 × 10{sup 15} ions/cm{sup 2} and 1 × 10{sup 16} ions/cm{sup 2}, respectively. Using transmission electron microscopy, the internal structure of the ion irradiated nanowires is analyzed. At low fluence, a transformation from crystalline H{sub 2}Ti{sub 3}O{sub 7} to amorphous TiO{sub 2} is observed. However, at higher fluence, a remarkable crystalline-amorphous TiO{sub 2} core-shell structure is formed. At this higher fluence, the recrystallization occurs in the core of the nanowire and the outer layer remains amorphous. The phase transformation and formation of core-shell structure are explained using the thermal spike model, radiation enhanced diffusion, and classical theory of nucleation and growth under non-equilibrium thermodynamics. X-ray photoelectron spectroscopy and Raman scattering reveal further insight into the structure of the nanowires before and after ion irradiation.
Authors:
; ;  [1] ;  [2] ;  [3]
  1. School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751007 (India)
  2. Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden (Germany)
  3. Department of Metallurgical and Materials Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India)
Publication Date:
OSTI Identifier:
22303986
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 23; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; AMORPHOUS STATE; DIFFUSION; HYDROGEN COMPOUNDS; IRRADIATION; LAYERS; MONOCRYSTALS; NANOWIRES; NITROGEN IONS; PHASE TRANSFORMATIONS; QUANTUM WIRES; RAMAN EFFECT; RECRYSTALLIZATION; TEMPERATURE RANGE 0273-0400 K; THERMODYNAMICS; TITANATES; TITANIUM OXIDES; TRANSFORMATIONS; TRANSMISSION ELECTRON MICROSCOPY; X-RAY PHOTOELECTRON SPECTROSCOPY