Effects of Cu stoichiometry on the microstructure, electrical conduction, and dielectric responses of Y2/3Cu3Ti4O12

Liang, Pengfei; Li, Fuchao; Chao, Xiaolian; Yang, Zupei

doi:10.1016/j.ceramint.2015.05.089

Cited by 17 publications

(4 citation statements)

References 43 publications

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“…The better dielectric properties of NLCTO-50 should be closely correlated with the observed Cu-rich grain boundaries in these samples. The occurrence of Cu-rich phase in the grain boundaries and its role in enhancing the dielectric properties have been previously reported for Y 2/3 Cu 3 Ti 4 O 12 [38] and CCTO. [39] Even if a direct comparison with literature is difficult due to the different preparation methods and conditions used, we argue that the results in the present work are comparable to those reported in the literature: ε ∼ 8.7 × 10 3 & tan δ ∼ 0.114 (at 1.1 kHz) for NLCTO ceramics prepared by conventional solid state reaction [30] and ε ∼ 1.53 × 10 4 & tan δ ∼ 0.063 at 1 kHz for NLCTO ceramics prepared by sol-gel method.…”

Section: Resultsmentioning

confidence: 54%

Electrical and dielectric properties of Na _1/2 La _1/2 Cu ₃ Ti ₄ O ₁₂ ceramics prepared by high energy ball-milling and conventional sintering

Mahfoz-Kotb

Ahmad

2016

Chinese Phys. B

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We report on the measurements of the electrical and dielectric properties of Na 1/2 La 1/2 Cu 3 Ti 4 O 12 (NLCTO) ceramics prepared by high energy ball-milling and conventional sintering without any calcination steps. The x-ray powder diffraction analysis shows that pure perovskite-like CCTO phase is obtained after sintering at 1025 • C-1075 • C. Higher sintering temperatures result in multi-phase ceramics due to thermal decomposition. Scanning electron microscope observations reveal that the grain size is in a range of ∼ 3 µm-5 µm for these ceramics. Impedance spectroscopy measurements performed in a wide frequency range (1 Hz-10 MHz) and at various temperatures (120 K-470 K) are used to study the dielectric and electrical properties of NLCTO ceramics. A good compromise between high ε (5.7 × 10 3 and 4.1 × 10 3 at 1.1 kHz and 96 kHz, respectively) and low tan δ (0.161 and 0.126 at 1.1 kHz and 96 kHz, respectively) is obtained for the ceramic sintered at 1050 • C. The observed high dielectric constant behavior is explained in terms of the internal barrier layer capacitance effect.

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Section: Resultsmentioning

confidence: 54%

Electrical and dielectric properties of Na _1/2 La _1/2 Cu ₃ Ti ₄ O ₁₂ ceramics prepared by high energy ball-milling and conventional sintering

Mahfoz-Kotb

Ahmad

2016

Chinese Phys. B

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“…However, CCTO is believed up to date as a promising material among the large number of perovskite-related oxides, while recently several other oxides of ACu 3 Ti 4 O 12 type have also been confirmed by experiments to exhibit high dielectric constant behaviors. Y 2/3 Cu 3 Ti 4 O 12 (YCTO) is compositionally and structurally similar to that of CCTO which exhibits the giant dielectric-permittivity (ε r > 10 4 ) with good thermal stability (12). While YCTO may be promising material for the near future application in the electronic device, but only very few works have been reported (13).…”

Section: Introductionmentioning

confidence: 99%

Structural, impedance, and modulus spectroscopic studies on Y_2/3Cu₃Ti_3.95In_0.05O₁₂polycrystalline material prepared by flame synthesis method

Singh

Yadava

Woo

et al. 2016

Applied Spectroscopy Reviews

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The polycrystalline material Y 2/3 Cu 3 Ti 3.95 In 0.05 O 12 (YCTInO) having giant dielectric constant was prepared by flame synthesis method using metal nitrate and solid TiO 2 in ethylene glycol mono-methyl ether. X-ray powder diffraction (XRD) study on the material sintered at 1050 °C for 15 h reveals the single phase cubic perovskite structure. In Fourier transform infrared (FT-IR) spectroscopy, absorption bands were observed at 583 and 521 cm -1 corresponding to vibrations of Cu-O and 441 cm -1 of Ti-O-Ti, which are confirmed the single phase formation. X-ray photoelectron spectroscopy (XPS) data of YCTInO reveals the presence of Y 3d, Cu 2p, Ti 2p, Downloaded by [Library Services City University London] at 23:20 28 March 2016 ACCEPTED MANUSCRIPT ACCEPTED MANUSCRIPT 2In 3d, and O1s peaks of the elements, which justify the energy dispersive X-ray spectroscopy (EDX) results and compositional purity of the materials synthesized by the flame synthesis. The dielectric property of this material was studied in the frequency range of 0.01 Hz -100 kHz and the temperature range from 298 -440 K. The electrical behavior of the ceramic studied by impedance and modulus spectroscopy reveal that the dielectric permittivity (ε r ) values of the YCTInO were dominantly affected by the electrical properties of grain boundary.

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“…The structural defects caused by the segregation of CuO with the higher resistance drift rate for Cu-based oxide ceramics have been a hot topic of discussion. [19][20][21][22] However, the problem has not been adequately addressed. Therefore, it is difficult to predict the practicality of YCTO ceramics.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the thermosensitive properties and stability evaluation of YCTO ceramics have not been reported. The structural defects caused by the segregation of CuO with the higher resistance drift rate for Cu‐based oxide ceramics have been a hot topic of discussion 19–22 . However, the problem has not been adequately addressed.…”

Section: Introductionmentioning

confidence: 99%

Extremely enhanced thermal stability of Y_2/3Cu₃Ti₄O₁₂ ceramics by a Pechini method

Wei

et al. 2022

J Am Ceram Soc.

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Y 2/3 Cu 3 Ti 4 O 12 ceramic is a novel semiconductor with potential applications in electronic devices. However, its resistance drift and surface structure defects limit the application for negative temperature coefficient thermistor devices. A comparative study of solid-phase and a Pechini processing of Y 2/3 Cu 3 Ti 4 O 12 is presented in this paper, in the particular comparative study of stability. The Pechini method is found to be effective in lowering sintering temperature and improving thermal stability (ΔR/R 0 < 0.3%) in comparison with solid-phase method. The origin of the stability deterioration is related to the oxidation state of Cu ions and the migration of sublattice. The Pechini method overcomes stoichiometric ratio deviations and cation vacancy diffusion, thus reducing metal ion segregation in a continuous high-temperature environment and thereby showing unique insensitivity to oxygen. The important role of the Pechini method in improving thermal stability is revealed, which is expected to be used in the preparation of high stability electron devices.

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Effects of Cu stoichiometry on the microstructure, electrical conduction, and dielectric responses of Y2/3Cu3Ti4O12

Cited by 17 publications

References 43 publications

Electrical and dielectric properties of Na _1/2 La _1/2 Cu ₃ Ti ₄ O ₁₂ ceramics prepared by high energy ball-milling and conventional sintering

Electrical and dielectric properties of Na _1/2 La _1/2 Cu ₃ Ti ₄ O ₁₂ ceramics prepared by high energy ball-milling and conventional sintering

Structural, impedance, and modulus spectroscopic studies on Y_2/3Cu₃Ti_3.95In_0.05O₁₂polycrystalline material prepared by flame synthesis method

Extremely enhanced thermal stability of Y_2/3Cu₃Ti₄O₁₂ ceramics by a Pechini method

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Effects of Cu stoichiometry on the microstructure, electrical conduction, and dielectric responses of Y2/3Cu3Ti4O12

Cited by 17 publications

References 43 publications

Electrical and dielectric properties of Na 1/2 La 1/2 Cu 3 Ti 4 O 12 ceramics prepared by high energy ball-milling and conventional sintering

Electrical and dielectric properties of Na 1/2 La 1/2 Cu 3 Ti 4 O 12 ceramics prepared by high energy ball-milling and conventional sintering

Structural, impedance, and modulus spectroscopic studies on Y2/3Cu3Ti3.95In0.05O12polycrystalline material prepared by flame synthesis method

Extremely enhanced thermal stability of Y2/3Cu3Ti4O12 ceramics by a Pechini method

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Product

Resources

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Electrical and dielectric properties of Na _1/2 La _1/2 Cu ₃ Ti ₄ O ₁₂ ceramics prepared by high energy ball-milling and conventional sintering

Electrical and dielectric properties of Na _1/2 La _1/2 Cu ₃ Ti ₄ O ₁₂ ceramics prepared by high energy ball-milling and conventional sintering

Structural, impedance, and modulus spectroscopic studies on Y_2/3Cu₃Ti_3.95In_0.05O₁₂polycrystalline material prepared by flame synthesis method

Extremely enhanced thermal stability of Y_2/3Cu₃Ti₄O₁₂ ceramics by a Pechini method