Structural, spectroscopic and dielectric properties of Ca-doped BaTiO3

Khedhri, Mohamed Hassen; Abdelmoula, N.; Khemakhem, H.; Douali, R.; Dubois, Frédéric

doi:10.1007/s00339-019-2487-y

Cited by 38 publications

(12 citation statements)

References 44 publications

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“…Instead, the substitution of Ho 3+ for Ti 4+ ions leads to T m moving toward higher temperatures, similar to the incorporation of Ca 2+ [ 21 ]. In other words, the charge-coupled substitution of Gd 3+ and Ho 3+ at both Ba and Ti sites (Equation (5)) has different effects on T m , which was caused by the different effects of substitution for Gd 3+ and Ho 3+ on Ti-O octahedral distortion [ 60 ]. The photoluminescence analysis in Figure 4 d indicated that the Ho 3+ content in the Ti site increases.…”

Section: Resultsmentioning

confidence: 99%

Optimization of Sintering Conditions to Enhance the Dielectric Performance of Gd3+ and Ho3+ Codoped BaTiO3 Ceramics

Bai

Liu

et al. 2022

Molecules

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BaTiO3 dielectric capacitors, one of the important energy storage devices, play critical roles in storing electricity from renewable energies of water, wind, solar, etc. The synthesis of BaTiO3 ceramics with weak temperature dependence and a high dielectric constant at room temperature (εRT′) is an urgent problem to meet the miniaturization and large capacity of dielectric capacitors. Doping rare earth elements into BaTiO3 can solve this problem, but it is still challenging. In this work, we adopt a synergistic strategy of increasing εRT′ and improving the temperature stability by codoping Gd3+ and Ho3+, respectively, to address this challenge. By carefully adjusting the synthesis conditions in the solid-state reaction, codoping 7% Gd3+ and 7% Ho3+ in BaTiO3 (BGTH7) ceramics were synthesized. The temperature-dependent dielectric constant reveals that the obtained optimal BGTH7 ceramic satisfies the X7U specification and displays a stable ε′ in the temperature range of −55~125 °C. The optimal BGTH7 ceramic after sintering at 1400 °C for 6 h exhibits a high dielectric constant of 5475 and low dielectric loss (tan δ) of 0.0176, hitherto exhibiting the best performance in X7U ceramics. The findings in this work are conducive to the miniaturization and stabilization of dielectric energy storage devices.

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Section: Resultsmentioning

confidence: 99%

Optimization of Sintering Conditions to Enhance the Dielectric Performance of Gd3+ and Ho3+ Codoped BaTiO3 Ceramics

Bai

Liu

et al. 2022

Molecules

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“…Therefore, optimal addition of Sb 3+ to pure BT is considered to reduce the local disorder around the Ba 2+ atom and also affects the local structure of Ti 4 + [4]. have been actively studied by many researchers in the synthesis of BT substitutes for A and B sites [8,9].…”

Section: Resultsmentioning

confidence: 99%

Characterization and Physical Properties of Ba_0.9Sb_0.1TiO₃ Solid Solution

Kim

2019

Appl. Sci. Converg. Technol.

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BaTiO 3 is known to be an environmentally friendly electronic material with a phase transition temperature that can be controlled through the substitution of an appropriate additive. Physical changes of grain growth in Ba 0.9 Sb 0.1 TiO 3 were analyzed by adding a small amount of antimony to pure BaTiO 3. The Ba 0.9 Sb 0.1 TiO 3 solid solution with antimony substitution was prepared under various calcination and sintering conditions. The optimal conditions for sintering were confirmed and the grain growth process was clearly understood. As a result, the relationship between the dielectric properties and the polycrystalline structure of Ba 0.9 Sb 0.1 TiO 3 substituted with antimony was confirmed. The maximum dielectric constant of the Ba 0.9 Sb 0.1 TiO 3 solid solution was found to exceed about 5500 and the dielectric constant at room temperature reached nearly 4000. The transition temperature of Ba 0.9 Sb 0.1 TiO 3 was shifted closer to room temperature than that of pure BaTiO 3. Unlike the phase transition behavior of pure BaTiO 3 , the dielectric constant curve, which is a function of temperature for all samples, showed a very gradual change.

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“…The FTIR spectra of aluminium doped Barium Strontium Titanate (Al-BSTO) synthesized at 1250 °C for 4 h are shown in figure 6. The presence of a sharp absorption band in the 400-4000 cm −1 range suggests that the samples studied contain a significant quantity of H 2 O and OH [9,72]. In addition, the presence of a broad absorption band in the 400-4000 cm −1 region indicates that the materials under investigation include a considerable amount of H 2 O and OH.…”

Section: Fourier Transforms Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 99%

“…Doping the original state of BaTiO 3 converts it from an insulator to a semiconductor [8]. BaTiO 3 may be doped to form a double perovskite with dopant on both sites (A-site and B-site), resulting in dramatic changes in its dielectric and magnetic characteristics at standard room temperature, as well as the ability to exhibit multiferroicity [9]. For example, Ba 1-x Sr x TiO 3 (BST) perovskite developed from BaTiO 3 is one of the most significant ABO 3 -type ferroelectrics (BT) materials.…”

Section: Introductionmentioning

confidence: 99%

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba_0.6Sr_0.4Ti_1-xAl_xO₃ ceramics via Sr and Al Co-doping engineering

Mahmud

Ahamed

Khan

2022

Mater. Res. Express

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In this research, structural, magnetic, electrical, and optical properties of Al3+ substituted Ba0.6Sr0.4Ti1-xAlxO3 ceramics (where x = 0.00 to 0.20) have been investigated and discussed. The ceramic samples have been successfully synthesized by the conventional solid-state reaction method. The crystallinity of the prepared samples has been confirmed by X-ray peak broadening techniques such as the Williamson Hall (W-H) plot technique and the Scherrer method. The lattice constant "a", showing a significant drop as Al concentration increases, varies from 3.9420A to 3.9210A. The FTIR spectrum revealed a prominent peak between 435 cm−1 to 540 cm−1, without showing any secondary phase. Raman spectroscopic analysis showed that the prepared samples are in cubic phase with no phase transition. The shifting of a dominating peak in Raman at 580 cm-1 is due to the development of AlTi defects. VSM analysis at room temperature showed the ferromagnetic characteristics of all the samples. The highest value of the anisotropic constant (Ka~39.933 emu/cm3) has been seen at x=0.10. The real component of initial permeability is almost constant for the frequency range of about 75 MHz, and above this frequency range, it quickly reduces. At the high-frequency range, the prepared samples show an excellent relative quality factor due to the low dielectric loss, notably when x = 0.05. The prepared perovskites exhibited minimum eddy current loss characteristics due to the increment of AC resistivity at x=0.20. UV–visible spectroscopy shows a significant change in the energy bandgap from 3.23 eV to 3.04 eV with the doping concentrations.

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Structural, spectroscopic and dielectric properties of Ca-doped BaTiO3

Cited by 38 publications

References 44 publications

Optimization of Sintering Conditions to Enhance the Dielectric Performance of Gd3+ and Ho3+ Codoped BaTiO3 Ceramics

Optimization of Sintering Conditions to Enhance the Dielectric Performance of Gd3+ and Ho3+ Codoped BaTiO3 Ceramics

Characterization and Physical Properties of Ba_0.9Sb_0.1TiO₃ Solid Solution

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba_0.6Sr_0.4Ti_1-xAl_xO₃ ceramics via Sr and Al Co-doping engineering

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Structural, spectroscopic and dielectric properties of Ca-doped BaTiO3

Cited by 38 publications

References 44 publications

Optimization of Sintering Conditions to Enhance the Dielectric Performance of Gd3+ and Ho3+ Codoped BaTiO3 Ceramics

Optimization of Sintering Conditions to Enhance the Dielectric Performance of Gd3+ and Ho3+ Codoped BaTiO3 Ceramics

Characterization and Physical Properties of Ba0.9Sb0.1TiO3 Solid Solution

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba0.6Sr0.4Ti1-xAlxO3 ceramics via Sr and Al Co-doping engineering

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Product

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Characterization and Physical Properties of Ba_0.9Sb_0.1TiO₃ Solid Solution

Giant effect on structural, magnetic, electrical, and optical properties of lead-free Ba_0.6Sr_0.4Ti_1-xAl_xO₃ ceramics via Sr and Al Co-doping engineering