Influence of CTO additives on microstructure and electrical properties of CCTO ceramics

Guo, Yong; Tan, Junlang; Zhao, Jingchang

doi:10.1016/j.matchemphys.2021.125659

Cited by 17 publications

(4 citation statements)

References 36 publications

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“…[8,1] Several physical phenomena have been proposed to explain this phenomenon, but the most widely accepted model is the internal barrier layer capacitance (IBLC) model, which is an extrinsic mechanism. [9][10][11] According to the IBLC model, the CCTO ceramic is composed of two distinct components: n-type semiconducting grains and insulating grain boundaries. These components exhibit diverse electrical characteristics, indicating heterogeneity in their electrical properties.…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution, Dielectric, and Electric Behavior of Sm‐Doped BCTO Ceramic Fabricated by Semi‐Wet Method

Prajapati,

Rai,

Kumar

et al. 2024

Cryst. Res. Technol.

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Bi(2/3)‐xSmxCu3Ti4O12 (BSCTO x = 0.05, 0.10, and 0.20) ceramics are synthesized using semi‐wet technique and an extensive investigation into their structural, morphological, and elemental properties, alongside dielectric and impedance behaviors, is meticulously carried out. X‐ray powder diffraction analysis unequivocally confirmed the formation of a monophasic BCTO cubic phase without any discernible secondary phases. and the crystallite size of the BSCTO ceramic, obtained by X‐ray diffraction using Debye Scherrer formula, range from 62 to 81 nm. Rietveld analysis reveals that ceramics have a body centered cubic structure with space group Im‐3. The Scanning electron microscope image displays the dense microstructure of the ceramics, while EDX analysis unveils the elemental composition of resulting products. Doping with Sm3+ induced a notable reduction in grain size, as observed through Scanning electron microscope and Atomic Force Microscope analyses, indicating Sm3+ hindered grain growth during sintering, potentially resulting in reduced dielectric constant (ε′). Dielectric constant and dielectric loss of the composition (x = 0.2) are found to be ≈152 and 0.04, respectively at room temperature (1 kHz). Impedance characteristics revealed a substantial increase in grain boundary resistance, leading to improved dielectric loss. The AC conductivity of BSCTO ceramics exhibited a frequency‐dependent increase satisfying to Johncher's power law.

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Section: Introductionmentioning

confidence: 99%

Phase Evolution, Dielectric, and Electric Behavior of Sm‐Doped BCTO Ceramic Fabricated by Semi‐Wet Method

Prajapati,

Rai,

Kumar

et al. 2024

Cryst. Res. Technol.

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“…[20][21][22] Moreover, the nanoscale barrier layer capacitance structure formed by special interfacial barriers in the CCTO composite ceramic grains substantially improves dielectric properties while maintaining relatively low dielectric loss. [23][24][25][26] However, it is still unclear whether there are similar structures in other ACTO system ceramics and whether it motivates the heterogeneity of YCTO grains. In addition, excess TiO 2 can promote the electron hopping between Cu + /Cu 2+ and Ti 3+ /Ti 4+ ions in CCTO to enhance the grain semiconducting properties, ultimately leading to an increase in dielectric constant (see Table S1 for details).…”

Section: Introductionmentioning

confidence: 99%

“…Recent studies have shown that grain heterogeneity is more pronounced in pure‐phase YCTO ceramic than in CCTO and has not been effectively elucidated 20–22 . Moreover, the nanoscale barrier layer capacitance structure formed by special interfacial barriers in the CCTO composite ceramic grains substantially improves dielectric properties while maintaining relatively low dielectric loss 23–26 . However, it is still unclear whether there are similar structures in other ACTO system ceramics and whether it motivates the heterogeneity of YCTO grains.…”

Section: Introductionmentioning

confidence: 99%

Giant dielectric response and grain heterogeneity of Y_2/3Cu₃Ti₄O₁₂–TiO₂ composite ceramics fabricated by hydrothermal process

et al. 2023

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Due to the boom of the electronic information industry, dielectric ceramic materials are widely applied in passive components such as multilayer ceramic capacitors. In this article, Y2/3Cu3Ti4O12–TiO2 composite ceramics with outstanding dielectric properties (εr = 2.29 × 106 at 20 Hz, εr = 4.49×105 at 1 kHz) were successfully prepared by hydrothermal and in situ solid‐state methods. The minimum dielectric loss value (at 1 kHz) of the obtained composite ceramics is about 0.57. The experimental results show that Y2/3Cu3Ti4O12 has a composite perovskite structure with cation vacancies, which causes internal electron‐pinned defect‐dipole, and the easy entry of excessive titanium ions to produce donor defects. Meanwhile, the heterogeneous grains with a pomegranate‐like microstructure were observed in the prepared composite ceramics, and interfacial polarization between subgrain boundaries was substantiated by impedance analysis. The abundant weakly trapped electrons and more polarized interfaces formed by grain and subgrain boundaries are the primary sources of the excellent dielectric properties of composite ceramics.

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“…Several other properties of CaTiO3-based composites are under recent investigations. In a recent paper [13], the electrical properties, XPS-results, and impedance of CaCu3TiO12 -CaTiO3 have been thoroughly explained. In another paper [14], the CaTiO3 -LaAlO3 composite microwave ceramic has been used in designing dielectric patch antennas.…”

Section: Introductionmentioning

confidence: 99%

Effect of A-site modification on structural and microwave dielectric properties of calcium titanate

Rajput

Keshri

2022

J Met Mater Miner

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This article presents studies on characteristics properties of CaTiO3, Ca0.8Sr0.2TiO3, and Ca0.6La0.8/3TiO3 ceramics. These ceramics were synthesized using the solid-state reaction process. Structural examination revealed that the grown ceramics have an orthorhombic structure with the Pbnm space group. The random distribution of particle size was shown through morphological investigation. Apparent density of developed ceramics was determined using the Archimedes technique and found to be ˂ 90%. The microwave dielectric properties of grown ceramics are compared on the basis of ionic polarizability. It is observed that partial replacement of Ca-ions by Sr-ions provides a high permittivity value (er = 168.93), higher quality factor Q × f = 9,330 GHz), and enhanced positive temperature coefficient of resonant frequency (tf = 908.17). However, the substitution of Ca-ions by La-ions offers a low permittivity value (113.35), higher quality factor (16,730 GHz), and decreased temperature coefficient of resonant frequency (229.49 ppm/°C). These materials can be used with the ceramics possessing a negative temperature coefficient of resonant frequency to balance its tf- value nearly to zero.

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Influence of CTO additives on microstructure and electrical properties of CCTO ceramics

Cited by 17 publications

References 36 publications

Phase Evolution, Dielectric, and Electric Behavior of Sm‐Doped BCTO Ceramic Fabricated by Semi‐Wet Method

Phase Evolution, Dielectric, and Electric Behavior of Sm‐Doped BCTO Ceramic Fabricated by Semi‐Wet Method

Giant dielectric response and grain heterogeneity of Y_2/3Cu₃Ti₄O₁₂–TiO₂ composite ceramics fabricated by hydrothermal process

Effect of A-site modification on structural and microwave dielectric properties of calcium titanate

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Influence of CTO additives on microstructure and electrical properties of CCTO ceramics

Cited by 17 publications

References 36 publications

Phase Evolution, Dielectric, and Electric Behavior of Sm‐Doped BCTO Ceramic Fabricated by Semi‐Wet Method

Phase Evolution, Dielectric, and Electric Behavior of Sm‐Doped BCTO Ceramic Fabricated by Semi‐Wet Method

Giant dielectric response and grain heterogeneity of Y2/3Cu3Ti4O12–TiO2 composite ceramics fabricated by hydrothermal process

Effect of A-site modification on structural and microwave dielectric properties of calcium titanate

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Giant dielectric response and grain heterogeneity of Y_2/3Cu₃Ti₄O₁₂–TiO₂ composite ceramics fabricated by hydrothermal process