Giant dielectric behavior and electrical properties of Ca1−3x/2Lu x Cu3Ti4O12 ceramics

Boonlakhorn, Jakkree; Kidkhunthod, Pinit; Putasaeng, Bundit; Yamwong, Teerapon; Thongbai, Prasit; Maensiri, Santi

doi:10.1007/s00339-015-9172-6

Cited by 12 publications

(9 citation statements)

References 38 publications

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“…tanδ values (at 1 kHz and 20°C) of the NYCTO‐1 h, NYCTO‐5 h, NYCTO‐10 h, and NYCTO‐20 h samples were 0.111, 0.096, 0.030, and 0.033, respectively, while ε′ values were, respectively, 1437, 9321, 18086, and 23152. At 10 2 Hz, the optimized tanδ values of NYCTO ceramics were much lower than that of CCTO ceramics . The overview effects of sintering time on the dielectric properties are clearly shown in the inset of Fig.…”

Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

“…It is widely accepted that the dielectric and electrical properties of CCTO and ACu 3 Ti 4 O 12 ceramics strongly correlated with the electrically heterogeneous microstructure. [3][4][5]30 Thus, impedance spectroscopy was used to characterize the electrical responses of grains and grain boundaries. For ACu 3 Ti 4 O 12 ceramics, the grain-boundary resistance (R gb ) and grain resistance (R g ) can normally be evaluated from the diameter of large semicircular arc in a low-frequency range and from a nonzero intercept on the Z 0 axis at high frequencies, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…X‐ray absorption near‐edge structure (XANES) spectra were collected at the SUT‐NANOTEC‐SLRI XAS beamline (BL5.2) (electron energy of 1.2 GeV; bending magnet; beam current 80–150 mA; 1.1 to 1.7 × 10 11 photon/s) at the Synchrotron Light Research Institute (SLRI), Nakhon Ratchasima, Thailand. Details of this characterization technique and analysis are given elsewhere . Finally, the normalized XANES data were processed and analyzed after background subtraction in the pre edge and post edge region using ATHENA software included in an IFEFFIT package …”

Section: Methodsmentioning

confidence: 99%

“…Details of this characterization technique and analysis are given elsewhere. 30 Finally, the normalized XANES data were processed and analyzed after background subtraction in the pre edge and post edge region using ATHENA software included in an IFEFFIT package. 31 Au was sputtered onto each surface of the sintered sample at a current of 25 mA for 8 minute using a Polaron SC500 sputter coating unit.…”

Section: Methodsmentioning

confidence: 99%

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Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na_1/2Y_1/2Cu₃Ti₄O₁₂ Ceramics

et al. 2016

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The dielectric and non‐Ohmic properties of Na1/2Y1/2Cu3Ti4O12 ceramics sintered under various conditions to obtain different microstructures were investigated. Microstructure analysis confirmed the presence of Na, Y, Cu, Ti, and O and these elements were well dispersed in the microstructure. Na1/2Y1/2Cu3Ti4O12 ceramics exhibited non‐Ohmic characteristics with large nonlinear coefficients of about 5.7–6.6 irrespectively of sintering conditions. The breakdown electric field of fine‐grained ceramic with the mean grain size of ≈1.7 μm (≈5600 V/cm) was much larger than those of the course‐grained ceramics with grain sizes of ≈9.5–10.4 μm (≈1850–2180 V/cm). Through optimization of sintering conditions, a low loss tangent of about 0.03 and very high dielectric permittivities of 18 000–23 000 with good temperature stability were successfully accomplished. The electrical responses of the grains and grain boundaries can, respectively, be well described using admittance and impedance spectroscopy analyses based on the brickwork layer model. A possible mechanism for the origin of semiconducting grains is discussed. The colossal dielectric response was reasonably described as closely correlated with the electrically heterogeneous microstructure by means of strong interfacial polarization at the insulating grain‐boundary layers. The non‐Ohmic properties of Na1/2Y1/2Cu3Ti4O12 ceramics were primarily related to their microstructure, i.e., grain size and volume fraction of grain boundaries.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na_1/2Y_1/2Cu₃Ti₄O₁₂ Ceramics

et al. 2016

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Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Wang

Jie

Yang

et al. 2019

Adv Funct Materials

146

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Ever since the beginning of this century, many kinds of materials have been reported to demonstrate colossal permittivity (CP) or colossal dielectric constant exceeding 10 3 . Accordingly, such CP materials and their further modification and improvement to achieve enhanced CP performance for promising applications in modern electronics, sensors, energy storage, and multifunctional devices and so on have attracted extensive attention. In this review, 2 a general overview of the recent advances in CP materials is provided, ranging from their various categories, physical mechanisms, and modulation methods to promising applications.First, various classes of CP materials are categorized in terms of their structures and dielectric properties. Subsequently, this review provides an insight into the CP mechanisms in views of barrier layer capacitance, defect-dipole cluster and polaronic effect. Moreover, the strategies and prototypical works are introduced in some aspects, including the manipulation of CP properties by doping, percolative capacitors and the methods employed to enhance the dielectric behaviors in CP materials with different forms. We then discuss a wide range of applications based on CP materials, such as modern electronics and energy storage. Finally, the challenges and opportunities for further investigation of CP materials are highlighted in the summary and future perspectives.

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Microstructures and dielectric properties of sol-gel prepared K-doped CaCu3Ti4O12 ceramics

et al. 2018

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Giant dielectric behavior and electrical properties of Ca1−3x/2Lu x Cu3Ti4O12 ceramics

Cited by 12 publications

References 38 publications

Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na_1/2Y_1/2Cu₃Ti₄O₁₂ Ceramics

Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na_1/2Y_1/2Cu₃Ti₄O₁₂ Ceramics

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Microstructures and dielectric properties of sol-gel prepared K-doped CaCu3Ti4O12 ceramics

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Giant dielectric behavior and electrical properties of Ca1−3x/2Lu x Cu3Ti4O12 ceramics

Cited by 12 publications

References 38 publications

Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na1/2Y1/2Cu3Ti4O12 Ceramics

Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na1/2Y1/2Cu3Ti4O12 Ceramics

Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications

Microstructures and dielectric properties of sol-gel prepared K-doped CaCu3Ti4O12 ceramics

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Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na_1/2Y_1/2Cu₃Ti₄O₁₂ Ceramics

Non‐Ohmic Properties and Electrical Responses of Grains and Grain Boundaries of Na_1/2Y_1/2Cu₃Ti₄O₁₂ Ceramics