Micro-Raman study on the softening and stiffening of phonons in rutile titanium dioxide film: Competing effects of structural defects, crystallite size, and lattice strain

Gautam, Subodh K.; Singh, Fouran; Sulania, Indra; Singh, R.G.; Kulriya, P.K.; Pippel, Eckhard

doi:10.1063/1.4868079

Cited by 48 publications

(28 citation statements)

References 42 publications

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“…The damage induced in UO 2 by He ion irradiation was more particularly investigated . Recently, a research group from the Inter University Accelerator Centre (IUAC, New Delhi) has installed an in situ micro‐Raman setup, based on a Renishaw In Via Raman microscope equipped with a fiber optic probe (FOP), coupled to a tandem Pelletron™ able to deliver swift heavy ion beams . After each increment of ion fluence, the target ladder is rotated by 90° for recording the micro‐Raman spectra.…”

Section: Introductionsupporting

confidence: 88%

Monitoring of the microstructure of ion‐irradiated nuclear ceramics by in situ Raman spectroscopy

Miro

Bordas

Thomé

et al. 2015

J Raman Spectroscopy

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Raman spectroscopy is an efficient technique for studying the evolution of microstructure of materials under irradiation. For that purpose, a Raman spectrometer has been recently installed at the JANNUS‐Saclay platform. In this paper, we describe the new setup for in situ experiments. These in situ experiments allowed following the microstructural evolution of different materials (SiC, ZrO2 and B4C) as a function of ion fluence on a single sample (either single crystal or polycrystalline ceramics) under the same irradiation conditions. Our results show that Raman spectroscopy is a versatile non‐contact technique for studying on‐line crystalline phase changes or amorphization of irradiated iono‐covalent solids. A detailed analysis of Raman spectra is provided for the three materials (SiC, ZrO2 and B4C) investigated in this study, revealing quite different behaviors upon irradiation. Basically, Raman spectroscopy gives insight on these evolutions at the level of bonds given by specific phonon modes, in good agreement with Rutherford backscattering channeling (RBS/C), X‐ray diffraction (XRD) or transmission electron microscopy (TEM) data, which provide information at a long‐range scale. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Introductionsupporting

confidence: 88%

Monitoring of the microstructure of ion‐irradiated nuclear ceramics by in situ Raman spectroscopy

Miro

Bordas

Thomé

et al. 2015

J Raman Spectroscopy

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“…Further, effective diameter (d) of ion track can be calculated using Poison equation [39,40]. In present work, the diameter of ion tracks is calculated using IL spectra.…”

Section: Resultsmentioning

confidence: 99%

Ion beam induced luminescence studies of sol gel derived Y2O3:Dy3+ nanophosphors

Shivaramu

Nagabhushana

Lakshminarasappa

et al. 2016

Journal of Luminescence

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a b s t r a c tPure and Dy 3 þ doped Y 2 O 3 are prepared by sol-gel technique. The samples are annealed at 900°C to obtain crystalline phase. X-ray diffraction (XRD) patterns confirm cubic phase of Y 2 O 3 . The crystallites size is calculated using Scherrer formula and is found to be in the order of 29.67 nm. The particles are found to be spherical in nature and their sizes are estimated to be 35 nm by scanning electron microscope (SEM) technique. Online ionoluminescence (IL) spectra of pure and Dy 3 þ doped Y 2 O 3 are recorded with 100 MeV Si 8 þ ions with fluence in the range 0.375-6.75 Â 10 13 ions cm À 2 . Undoped samples do not show IL emission for any of the fluence explored. Four prominent IL emissions with peaks at 488, 670, 767 nm and a prominent pair at 574 and 584 nm are observed in Dy 3 þ doped samples. These characteristic emissions are attributed to luminescence centers activated by Dy 3 þ ions due to 4 F 9/2 -6 H 15/2 , 4 F 9/2 -6 H 11/2, 4 F 9/2 -6 H 9/2 þ 6 H 11/2 and 4 F 9/2 -6 H 13/2 transitions respectively. Further, it is found that IL intensity at 574 nm decays rapidly with ion fluence. A broad and weak photoluminescence (PL) emission with peak at $ 485 nm and a strong emission at 573 nm are observed in ion irradiated Y 2 O 3 :Dy 3 þ . It is found that PL intensity increases with ion fluence up to 3 Â 10 10 ions cm À 2 and then it decreases with further increase of ion fluence. This may be attributed to lattice disorder produced by dense electronic excitation under swift heavy ion irradiation.

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“…2a, exhibit E g modes that are less blue-shifted than the same exhibited by HANTs. In addition to crystallite size, lattice strain and defect affect Raman peak shifting, broadening, and intensity, 27 which are attributed to the presence of asymmetric structures, typically Ti-O bonds 28 causing softening of the E g mode. The Raman data (Fig.…”

mentioning

confidence: 99%

Rutile phase n- and p-type anodic titania nanotube arrays with square-shaped pore morphologies

et al. 2015

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Rutile-phase TiO2 nanotube arrays without broken walls were formed by annealing of anodically formed nanotubes in a propane flame at 650 °C and in air at 750 °C. An unusual morphological transformation was observed from the ellipsoidal pore-shapes of titania nanotubes grown in aqueous electrolyte to a square-shaped pore structure subsequent to the anneals. 750 °C annealed nanotubes were found to be lightly p-type, rare in TiO2.

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Micro-Raman study on the softening and stiffening of phonons in rutile titanium dioxide film: Competing effects of structural defects, crystallite size, and lattice strain

Cited by 48 publications

References 42 publications

Monitoring of the microstructure of ion‐irradiated nuclear ceramics by in situ Raman spectroscopy

Monitoring of the microstructure of ion‐irradiated nuclear ceramics by in situ Raman spectroscopy

Ion beam induced luminescence studies of sol gel derived Y2O3:Dy3+ nanophosphors

Rutile phase n- and p-type anodic titania nanotube arrays with square-shaped pore morphologies

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