Variation of mechanical properties of TiO2 during Li insertion

Lindstrom, Henrik
Dericioğlu, Arcan Fehmi
Kamei, Masayuki
Kagawa, Yutaka
TiO2 films were produced by low-temperature reactive magnetron sputtering and characterized by X-ray diffraction, atomic force microscopy, scanning electron microscopy, electrochemistry, and mechanical-indentation techniques. The TiO2 films consisted of 20-30 nm particles. Electrochemical Li-insertion experiments revealed that the Li diffusion along grain boundaries was much faster compared to the diffusion into the TiO2 grains. The mechanical properties of the films changed drastically after electrochemical Li insertion; the microhardness increase of the Li-inserted TiO2 samples was in the range 70-104% with maximum values ranging between 5.8 and 6.5 GPa. Hardness measurements on a Li-extracted sample showed that the changes in mechanical properties were irreversible. (c) 2007 The Electrochemical Society.


Effect of thermal neutron irradiation on the elastic constants of tourmaline
Özkan, H. (Informa UK Limited, 1987-2)
The effect of thermal neutron irradiation due to the B10(n, α)Li7 reaction on the elastic wave velocities and the elastic moduli of tourmaline crystals has been studied. Oriented tourmaline samples have been irradiated with thermal neutrons to 7.6 × 1018n/cm2 and the elastic wave velocities determined by ultrasonic measurements. The elastic wave velocities are not affected by thermal neutron irradiation below 8 × 10l7n/cm2, effects starting to appear at approximately 1 × l018n/cm2 with more important decrea...
Effect of Magnesium and Osteoblast Cell Presence on Hydroxyapatite Formation on (Ti,Mg)N Thin Film Coatings
Onder, Sakip; Calikoglu-Koyuncu, Ayse Ceren; Kose, Gamze Torun; Kazmanli, Kursat; Kök, Fatma Neşe; Urgen, Mustafa (Springer Science and Business Media LLC, 2017-07-01)
TiN and (Ti,Mg)N thin film coatings were deposited on Ti substrates by an arc-physical vapor deposition technique. The effect of cell presence on hydroxyapatite (HA) formation was investigated using surfaces with four different Mg contents (0, 8.1, 11.31, and 28.49 at.%). Accelerated corrosion above 10 at.% Mg had a negative effect on the performance in terms of both cell proliferation and mineralization. In the absence of cells, Mg-free TiN coatings and low-Mg (8.1 at.%)-doped (Ti,Mg)N surfaces led to an e...
The role of amorphous precursor in phase selection hierarchy in marginal metallic glasses
YILDIRIM, CİHAN; KUTSAL, M.; OTT, R. T.; BESSER, M. F.; KRAMER, M. J.; Kalay, Yunus Eren (Elsevier BV, 2016-12-15)
The solid state amorphous structure and devitrification products of Al90Tb10 alloys produced by Cu block meltspinning and magnetron sputtering were investigated by a combined study of differential scanning calorimetry, in-situ X-ray diffraction and conventional transmission electron microscopy. The as-prepared specimens were found to be fully amorphous according to the electron and X-ray diffraction. The thermal analysis and in-situ XRD analyses of the amorphous samples having the same chemistry but differe...
Bright Visible Light Extraction from Amorphous Silicon Nitride Heterojunction Pin Diode
ANUTGAN, TAMİLA; ANUTGAN, MUSTAFA; ATILGAN, İSMAİL; Katircioglu, B. (The Electrochemical Society, 2011-01-01)
We report the transformation of an ordinary hydrogenated amorphous silicon nitride based heterojunction pin diode into a strong visible light emitting electroluminescent device. This forming process (FP) comprises Joule heating induced crystallization during the application of sufficiently high forward bias to the fresh diode. FP starts at an arbitrary point and continues until the accompanying visible light is uniformly emitted from the whole diode. This remarkable phenomenon is presented by real-time phot...
Characterization of BPN Pyrotechnic Composition Containing Micro- and Nanometer-Sized Boron Particles
Koc, Suzan; Ulaş, Abdullah; Yilmaz, Nil Ezgi (Wiley, 2015-10-01)
The effect of micro- and nanometer-sized boron particles on boron-potassium nitrate (BPN) ignition composition was investigated in this paper. As a starting point, thermochemical calculations were made to determine the most promising ignition compositions. Both stoichiometric and fuel-rich formulations of BPN were produced to observe the performance variation due to boron content. Particle morphology of boron particles and the surface structure of the ignition compositions were investigated by SEM. The infl...
Citation Formats
H. Lindstrom, A. F. Dericioğlu, M. Kamei, and Y. Kagawa, “Variation of mechanical properties of TiO2 during Li insertion,” ELECTROCHEMICAL AND SOLID STATE LETTERS, pp. 0–0, 2007, Accessed: 00, 2020. [Online]. Available: