Structural, electrical and optical properties of Ba(Ti1−xYb4x/3)O3 ceramics

Ganguly, M.; Rout, S. K.; Ahn, Chang Won; Kim, I.W.; Kar, Manoranjan

doi:10.1016/j.ceramint.2013.05.070

Cited by 42 publications

(18 citation statements)

References 55 publications

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“…B 1 ) Raman active optical modes and 1 (E ? A 1 ) acoustic mode [3]. Figure 2a shows the Raman spectra of the BT sample that depicts the A 1 (TO 1 ), A 1 (TO 2 ), A 1 (TO 3 ) and A 1 (LO 3 ) modes located at *164, 256, 509 and 714 cm -1 , respectively.…”

Section: Raman Spectroscopymentioning

confidence: 98%

“…It can be observed that at first dielectric constant increases for x = 0.05 and then it decreases with further increase in strontium content. It is a well-known fact that dielectric constant is directly proportional to tetragonality, grain size and density of the material [3]. The slight increase in dielectric constant in BST05 may be attributed to the small increase in grain size and density.…”

Section: Dielectric Studiesmentioning

confidence: 98%

“…Many commercial applications like pyroelectric sensors require the ferroelectric Curie temperature of BaTiO 3 based materials to be close to room temperature, which can be achieved by substituting various transition metals and rare earths on A-site and B-site depending on the solubility [1,2]. Barium strontium titanate is one of the promising material for tunable microwave devices and dynamic random access memory applications [3,4]. It has been observed that materials which have high dielectric constant also possess high dielectric loss and high dielectric constant with high loss in a material can cause substantial impedance mismatch problems.…”

Section: Introductionmentioning

confidence: 99%

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Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Jain

Panwar

Jha

2016

J Mater Sci: Mater Electron

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In the present study, specimens of composition Ba 1-x Sr x TiO 3 (x = 0.0, 0.05, 0.075, 0.10 & 0.15) were synthesized using mechanochemical activation technique and their structural, dielectric and ferroelectric characteristics were investigated for the major applications such as a multi-layered ceramic capacitor (MLCC) and microwave tunable devices. Structural analysis using X-ray diffraction pattern of the systems by Rietveld refinement confirms the formation of tetragonal phase with P4 mm space group. The intensity ratio of bonds and wave number shift in Raman spectra suggests little structural changes with strontium content. Microstructural investigation reveals that there is no appreciable change in grain size with increasing strontium concentration. The results on the variation of dielectric constant with temperature suggest the shifting of Curie temperature to lower temperature side with increasing strontium concentration. Current-voltage characteristics reveal that with increasing strontium content current increases which can be correlated with the observed variation of activation energy of the studied samples, which also decreases with the increasing concentration of strontium.

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Section: Raman Spectroscopymentioning

confidence: 98%

Section: Dielectric Studiesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Jain

Panwar

Jha

2016

J Mater Sci: Mater Electron

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“…On the other hand, the structural information of BaTiO 3 doped with most rare earths such as La 17–20 , Ce 21, 22 , Pr 23 , Nd 24 , Eu 25 , Tb 26 , Dy 27 , Er 28 , Yb 29, 30 , has been reported via laser Raman spectroscopy to date. However, no Raman information is known about Ho-doped BaTiO 3 .…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence associated with the site occupations of Ho3+ ions in BaTiO3

Guan

2017

Sci Rep

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A nominal (Ba 1−x Ho x )Ti 1−x/4 O 3 (x = 0.01) (BHTH) ceramic with a single-phase tetragonal structure was prepared at 1400 °C using the solid-state reaction method. The analysis on the defect chemistry revealed that the real formula of BHTH is (Ba 1−x Ho 3x/4 )(Ti is known to be an amphoteric dopant in BaTiO 3 polycrystalline ceramic and its solid solubility is dependent on the Ba/Ti ratio and sintering temperature (T s ). In the Ti-rich case, Ho 3+ was considered to to occupy the Ba site to induce Ti vacancies and the solid solubility limit was relatively small, only x = ~1.4% at T s = 1400 °C; the formula was described as (Ba 1−x Ho x )Ti 1−x/4 O 3 10 . Higher T s is generally required for the incorporation of Ho 3+ into the Ti site because of a relatively larger ionic size of Ho 3+ compared to Ti 4+ (Table 1) 16 and TiO 6 octahedrons characteristic of the skeleton of the perovskite structure. In the Ba-rich case, the solubility limit was reported to be x = ~15% at T s = 1550 °C and the formula was described as Ba(Ti 1−x Ho x )O 3−x/2 with O vacancies 10,14,15 . However, Ti vacancies and O ones had not been confirmed in Ho-doped BaTiO 3 and one is hard to avoid questioning a single site-occupation mode due to the amphoteric nature of Ho 3+ . On the other hand, the structural information of BaTiO 3 doped with most rare earths such as La [17][18][19][20] , Ce

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“…High calcination temperatures and intense ball-milling are required in this procedure to promote slow solid-state diffusion [7]. As an alternative, different wet chemical methods have been employed to produce BaTiO 3 nanometer-scale powders including sol-gel, Pechini, sol-emulsion-gel, and solvothermal and coprecipitation methods.…”

Section: Introductionmentioning

confidence: 99%

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

Gomes

Magalhães

Paschoal

et al. 2018

Journal of Nanomaterials

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BaTiO 3 nanoparticles were successfully synthesized by a new coconut water-based sol-gel method using Ba(CH 3 COO) 2 and TiCl 3 as the starting salts. The influence of the amount of coconut water and calcination conditions on the barium titanate crystallization was investigated. The resulting nanoparticles were characterized by thermogravimetric and differential thermal analysis, X-ray diffraction, scanning electron microscopy, and Raman and Fourier transform infrared (FTIR) spectroscopies. The ferroelectric tetragonal single phase of BaTiO 3 was obtained in samples prepared with a ratio of coconut water volume (mL)/BaTiO 3 mass (g) of 25 : 2 and 30 : 2, calcined at 1100°C, which was confirmed by XRD measurements. Crystallites with an average size of about 31 nm for both samples were obtained, and microscopy images revealed the presence of particles in the range of 40 to 60 nm. Raman and FTIR spectra confirmed the dominant tetragonal phase of BaTiO 3 , meanwhile traces of BaCO 3 were identified in FTIR spectra.

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Structural, electrical and optical properties of Ba(Ti1−xYb4x/3)O3 ceramics

Cited by 42 publications

References 55 publications

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Photoluminescence associated with the site occupations of Ho3+ ions in BaTiO3

An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water

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Structural, electrical and optical properties of Ba(Ti1−xYb4x/3)O3 ceramics

Cited by 42 publications

References 55 publications

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Structural, dielectric and ferroelectric studies of Ba1−xSrxTiO3 ceramics prepared by mechanochemical activation technique

Photoluminescence associated with the site occupations of Ho3+ ions in BaTiO3

An Eco-Friendly Method of BaTiO3 Nanoparticle Synthesis Using Coconut Water

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An Eco-Friendly Method of BaTiO₃ Nanoparticle Synthesis Using Coconut Water