Optical, thermal and dielectric properties of Bi4(TiO4)3 ceramic powders

Kumar, G. Bhaskar; Buddhudu, S.

doi:10.1016/j.ceramint.2010.03.023

Cited by 23 publications

(19 citation statements)

References 25 publications

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“…Bismuth Titanate (Bi x Ti y O z ) compounds have been the subject of many studies due to their ferroelectric, piezoelectric and optical properties, which make them interesting materials for the fabrication of optical devices, ferroelectric memories, and lead-free piezoelectric sensors and actuators [1,2]. For instance, Bismuth Titanate (Bi 4 Ti 3 O 12 ) is a material with an Aurivillius crystal structure, which in turn is composed of fluorite-type layers and perovskite-type layers.…”

Section: Introductionmentioning

confidence: 99%

Potentiodynamic Polarization Studies and Surface Chemical Composition of Bismuth Titanate (BixTiyOz) Films Produced through Radiofrequency Magnetron Sputtering

et al. 2013

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The applications of Bismuth Titanate (BixTiyOz) materials have been focused on their electronic and optical properties, but with respect to the use of these compounds in applications like corrosion resistance, have been very few or nonexistent. For this reason, in the present investigation BixTiyOz thin films were deposited using RF magnetron sputtering onto silicon wafers, stainless steel 316L, and titanium alloy (Ti6Al4V) substrates, in order to carry out a study of the corrosion behavior of this compound. The structural properties of the coatings were studied through X-ray diffraction (XRD), the morphology was determined using Scanning Electron Microscopy (SEM), the corrosion resistance behavior of the coated and uncoated substrates was evaluated via the Potentiodynamic Polarization technique, and surface chemical composition was evaluated through X-ray photoelectron spectroscopy (XPS). The XRD results indicated that the films were amorphous. The SEM micrographs showed that the deposited films were homogeneous, but in some cases there were cracks. The potentiodynamic polarization technique showed that the corrosion current in the coated substrates decreased by an order of two magnitudes with respect to the uncoated substrates, but in both cases the corrosion mechanism was pitting due to the pores in the film. The XPS analysis shows that the deposited films contain both Bi3+ and Ti4+.

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Section: Introductionmentioning

confidence: 99%

Potentiodynamic Polarization Studies and Surface Chemical Composition of Bismuth Titanate (BixTiyOz) Films Produced through Radiofrequency Magnetron Sputtering

et al. 2013

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“…On the other hand, at higher frequency, hopping of the charge carriers through their respective interstice dominates. However, the hopping frequency legs behind due to the higher frequency of the applied alternating current, and hence, ε′ reduces . Increasing crystallinity increases the interfacial regions between the crystalline and amorphous phases, and this supports the former mechanism at lower frequencies promoting the dielectric constant.…”

Section: Resultsmentioning

confidence: 67%

Effect of Crystallization Temperature on Electrical Properties of Er³⁺/Yb³⁺–SrO.TiO₂ Borosilicate Glass

Maheshwari

Singh

Kumar

2015

Int J of Appl Glass Sci

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Er3+–Yb3+ doped 22[3SrO.2TiO2].30[2SiO2.B2O3] glass and glass–ceramics are developed and investigated for their electrical properties. The degree of crystallization is varied by means of crystallization temperature ranging from 600 to 1000°C. In glass–ceramic samples, two major crystalline phases, Sr3Ti2O7 and TiO2, are confirmed by diffraction analysis. The best crystallized glass–ceramic (crystallization temperature 950°C) sample shows 100–1 50 times lower impedance in temperature range, 200–300°C, than the uncrystallized glass. Electrical relaxation corresponding to the crystalline phase can be isolated in frequency domain. The glass–ceramic shows a 10–100 times higher dielectric constant than the glass in lower frequency range. This dielectric constant and dissipation factor increase with increasing temperature beyond a threshold value. Curie temperature was not visible in the measured temperature range.

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“…The marked bands in Li 2 MnSiO 4 sample are related to [SiO 4 ] tetrahedrons (528, 579, 889 and 920 cm −1 ) and C−O vibrational mode (1450 and 1510 cm −1 ) . However, the bands located at 410.7 and 433.9 cm −1 are detected only in Li 2 Mn 0.85 Ti 0.15 SiO 4 sample, which are associated with [TiO 6 ] octahedrons . Moreover, the small peak at 730.9 cm −1 should be assigned to [TiO 4 ] tetrahedrons .…”

Section: Resultsmentioning

confidence: 92%

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

Zhao

Wei

et al. 2018

ChemistrySelect

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Li2MnSiO4 cathode material suffers from structural distortion caused by irreversible transition of [MnO4] tetrahedron to [MnO6] octahedron and layer exfoliation upon full delithiation, thus resulting in rapid capacity decay during cycling. In this study, Ti was introduced into the Mn site in Li2MnSiO4 as pillars to prevent the structural collapse. The results showed that [TiO4] tetrahedrons and [TiO6] octahedrons coexisted in Mn sites, and the proportion of [TiO6] octahedrons increased with increasing Ti. [TiOx] pillared Li2MnSiO4 samples presented greatly improved cycling stability, especially [TiO6] enriched Li2Mn0.85Ti0.15SiO4, which achieved the highest initial Coulumbic efficiency (86%) and the best capacity retention at C/20 rate. Moreover, Li2Mn0.85Ti0.15SiO4 exhibited excellent rate performance and retained 93% of initial discharge capacity after 50th cycles at C/2 rate. Ex‐situ XPS revealed [TiOx] pillars, especially [TiO6] pillars facilitated the reversible transition of [MnOx] during cycling. Ex‐situ XRD demonstrated better structure reversibility of [TiO6] enriched sample. The enhanced structural reversibility and cycling stability are ascribed to the pillaring effect of [TiOx], especially large [TiO6] octahedrons in structure, which ensure the reversible oxidation/reduction of Mn and alleviate the layer exfoliation during cycling.

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Optical, thermal and dielectric properties of Bi4(TiO4)3 ceramic powders

Cited by 23 publications

References 25 publications

Potentiodynamic Polarization Studies and Surface Chemical Composition of Bismuth Titanate (BixTiyOz) Films Produced through Radiofrequency Magnetron Sputtering

Potentiodynamic Polarization Studies and Surface Chemical Composition of Bismuth Titanate (BixTiyOz) Films Produced through Radiofrequency Magnetron Sputtering

Effect of Crystallization Temperature on Electrical Properties of Er³⁺/Yb³⁺–SrO.TiO₂ Borosilicate Glass

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions

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Optical, thermal and dielectric properties of Bi4(TiO4)3 ceramic powders

Cited by 23 publications

References 25 publications

Potentiodynamic Polarization Studies and Surface Chemical Composition of Bismuth Titanate (BixTiyOz) Films Produced through Radiofrequency Magnetron Sputtering

Potentiodynamic Polarization Studies and Surface Chemical Composition of Bismuth Titanate (BixTiyOz) Films Produced through Radiofrequency Magnetron Sputtering

Effect of Crystallization Temperature on Electrical Properties of Er3+/Yb3+–SrO.TiO2 Borosilicate Glass

Improved Structural Reversibility and Cycling Stability of Li2MnSiO4 Cathode Material by the Pillar Effect of [TiOx] Polyanions

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Effect of Crystallization Temperature on Electrical Properties of Er³⁺/Yb³⁺–SrO.TiO₂ Borosilicate Glass

Improved Structural Reversibility and Cycling Stability of Li₂MnSiO₄ Cathode Material by the Pillar Effect of [TiO_x] Polyanions