Calcium titanate (CaTiO 3 ) dielectrics prepared by plasma spray and post-deposition thermal treatment

Ctibor, Pavel; Kotlan, Jiří; Pala, Zdeněk; Sedláček, Josef; Hájková, Zuzana; Grygar, Tomáš Matys

doi:10.1016/j.materresbull.2015.07.041

Cited by 15 publications

(5 citation statements)

References 24 publications

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“…e alkaline earth titanate, calcium titanate (CaTiO 3 ), has attracted attention because it is semiconductive, ferroelectric, and photorefractive. In addition, dielectrics based on calcium titanate are widely used in different high-frequency electronic applications such as capacitors, oscillators, filters, and resonators for microwave systems [1]. Several approaches are adopted for the synthesis of calcium titanate either by soft chemistry such as sol-gel or by hydrothermal or solvothermal methods, coprecipitation, or organicinorganic solution [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties

Cherdchom

Rattanaphan

Chanadee

2019

Advances in Materials Science and Engineering

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Calcium titanate (CaTiO 3 ) was combustion synthesized from a calcium source of waste duck eggshell, anatase titanium dioxide (A-TiO 2 ), and magnesium (Mg). e eggshell and A-TiO 2 were milled for 30 min in either a high-energy planetary mill or a conventional ball mill. ese powders were then separately mixed with Mg in a ball mill. After synthesis, the combustion products were leached and then sintered to produce CaTiO 3 ceramic. Analytical characterization of the as-leached combustion products revealed that the product of the combustion synthesis of duck eggshell + A-TiO 2 that had been high-energy-milled for 30 min before synthesis comprised a single perovskite phase of CaTiO 3 . e high-energy milling of the reactant powder had generated a large reactive surface area and induced structural defects, both of which drove the completion of the combustion reaction and the phase conversion of the reactants into the product. A calcium titanate ceramic, fabricated by sintering as-leached powdered combustion product at 1350°C for 180 min, achieved a maximum density of 3.65 g/cm 3 and a minimum porosity of 0.54%. e same fabricated calcium titanate ceramic product also exhibited the highest dielectric constant (∼78) and the lowest dielectric loss (∼0.02), which resulted from the simplified charge polarization process.

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Section: Introductionmentioning

confidence: 99%

Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties

Cherdchom

Rattanaphan

Chanadee

2019

Advances in Materials Science and Engineering

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“…A decrease in ε΄ with increasing frequency is due to the fact the dipole lags behind the applied field at higher frequencies. The decrease of ε΄ with increasing frequency as observed for LTNO materials is a typical dielectric behavior seen in many of the traditional dielectrics with a high dielectric constant [2][3][4]11]. At room temperature, the values of ε΄ (at 100 Hz) in Li,Ti codoped NiO compounds are exceedingly higher (~10 5 ) than that of pure NiO (~900).…”

Section: Nickel-based Multi-component Oxide Ceramics Have Been the Rmentioning

confidence: 81%

“…Simple and multi-component oxide dielectrics play key role in a wide variety of current and emerging technologies [1][2][3][4][5]. While there has been a great deal of interest in the wide band gap oxide materials for electronics, electro-optics, opto-electronics and magneto-electronics, a special attention is drawn in recent years towards the materials with high and/or giant dielectric constant for their expected revolutionary applications in micro/nano-electronics industry [1][2][3][4][5][6]. Such materials will have enormous applications in electrical storage and electronic data processing devices.…”

Section: Introductionmentioning

confidence: 99%

Controlled and enhanced dielectric properties of high-titanium containing Li Ti0.1Ni1⿿O via chemical composition-tailoring

Puli

Picchini

Orozco

et al. 2016

Chemical Physics Letters

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Tuning the dielectric properties via composition-tailoring is demonstrated for variablelithium, constant-titanium co-doped nickel oxide (LixTi0.1Ni1-xO; x=0.05-0.30; referred to LTNO).. The effect of variable Li-content on the structure and dielectric properties of LTNO is investigated. X-ray diffraction studies confirm the formation of a cubic NiO phase in LTNO for x=0.05-0.30. However, lattice parameter reduction was evident with increasing Li-content. Composition-driven giant dielectric constant (10 4-10 5) was observed for a higher lithium content (x=0.15-0.30) leading to realization of LTNO ceramics. The origin of the high dielectric constant observed in these low density LTNO ceramics is attributed to the Maxwell-Wagner polarization mechanism.

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“…The first bandgap of ETOF0, E g1 (%2.8 eV) corresponds to the main absorbance and may be attributed to some oxygen vacancy, while the other two (%2.9 and 4.1 eV) may be due to delocalized electronic states with lower excitation energy. [60,61] The main absorbance energy gap, E g1 , for ETOF5 was estimated to be around 2.7 eV and that of ETOF10 is %2.6 eV. The reduction of energy bandgaps with Fe doping might be due to new interband formation as Fe doping introduced additional f-d and d-d interactions.…”

Section: Uv-vis Spectroscopymentioning

confidence: 99%

Effect of f–d and d–d Interactions on Dielectric and Optical Properties of Pyrochlore Eu_2−xFe_xTi₂O₇

Alam

Pal

Ghosh

et al. 2022

Physica Status Solidi (b)

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X‐ray diffraction, Raman spectroscopy, Fourier‐transform infrared (FTIR) spectroscopy, dielectric property, and UV–vis spectroscopy studies of pyrochlore Eu2−xFexTi2O7 have been performed. The X‐ray pattern shows that Eu2−xFexTi2O7 has a pure pyrochlore phase up to x = 0.2. The structural analysis shows a strong distortion of TiO6 octahedral due to the presence of the interstitial anionic vacant site. A significantly increased band intensity of FTIR spectrum with Fe doping suggests the enhanced anionic disorder in the system. The broadening of Raman peaks with increasing x supports the increased disorder in TiO6 octahedral. Dielectric study of Eu2Ti2O7 shows a diffused dielectric transition below 150 K. The dielectric diffusiveness and transition temperature get enhanced with Fe doping due to enhanced anionic distortion. The dielectric constant of Eu2−xFexTi2O7 is also increased on Fe doping. The UV–vis spectrum exhibits a strong absorbance in the UV region and a redshift with Fe doping. The Tauc plot of UV–vis spectrum shows multiple successive valence band edges and the bandgap gets reduced with Fe doping due to the formation of new interbands. Thus, these materials are interesting for people searching for material to be used in tunable electrical and optical devices.

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Calcium titanate (CaTiO 3 ) dielectrics prepared by plasma spray and post-deposition thermal treatment

Cited by 15 publications

References 24 publications

Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties

Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties

Controlled and enhanced dielectric properties of high-titanium containing Li Ti0.1Ni1⿿O via chemical composition-tailoring

Effect of f–d and d–d Interactions on Dielectric and Optical Properties of Pyrochlore Eu_2−xFe_xTi₂O₇

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Calcium titanate (CaTiO 3 ) dielectrics prepared by plasma spray and post-deposition thermal treatment

Cited by 15 publications

References 24 publications

Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties

Calcium Titanate from Food Waste: Combustion Synthesis, Sintering, Characterization, and Properties

Controlled and enhanced dielectric properties of high-titanium containing Li Ti0.1Ni1⿿O via chemical composition-tailoring

Effect of f–d and d–d Interactions on Dielectric and Optical Properties of Pyrochlore Eu2−xFexTi2O7

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Effect of f–d and d–d Interactions on Dielectric and Optical Properties of Pyrochlore Eu_2−xFe_xTi₂O₇