Electrical behavior analysis of n-type CaCu3Ti4O12 thick films exposed to different atmospheres

Ponce, Miguel Adolfo; Ramírez, M. A.; Schipani, Federico; Joanni, Ednan; Tomba, J. Pablo; Castro, Miriam Susana

doi:10.1016/j.jeurceramsoc.2014.08.041

Cited by 31 publications

(13 citation statements)

References 53 publications

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“…CaCu 3 Ti 4 O 12 CCTO ceramics and thin films are multifunctional due to its gas and moisture sensitivity . These reports indicate that electrical impedance of CCTO aged in air at RT can change either by moisture, oxygen absorption, or due to changes in the electrode material.…”

Section: Introductionmentioning

confidence: 95%

“…2,4,[6][7][8] Surface barrier layers between sample and electrode has also been reported to have an impact in controlling the dielectric properties of CCTO. 9,10 CaCu 3 Ti 4 O 12 CCTO ceramics and thin films are multifunctional due to its gas [11][12][13] and moisture sensitivity. [14][15][16][17] These reports indicate that electrical impedance of CCTO aged in air at RT can change either by moisture, oxygen absorption, or due to changes in the electrode material.…”

Section: Introductionmentioning

confidence: 99%

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Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

2019

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Calcium Copper Titanate Ceramics (CaCu3Ti4O12; CCTO) are useful as capacitors because of the large dielectric constant. This study investigated the effect of testing atmospheres such as air and dry N2 on the stability and reproducibility of the electrical properties displayed by CCTO ceramics. Solid‐state reaction method is used to synthesize phase pure CCTO powders, which are used to fabricate dense samples by sintering. Samples with different microstructures are obtained by sintering at different temperatures of 1070 and 1100°C. AC impedance spectroscopy is used to study the effects of testing atmospheres, temperatures, microstructures, and frequency on the dielectric properties of the sintered samples. Highly irreproducible dielectric properties are observed upon testing in ambient conditions. Stable and reproducible dielectric properties are only obtained in dry N2. Re‐exposing the same CCTO samples back into ambient air after treating in dry N2 restored irreproducibility. The results from this study suggested that the role of moisture/air in the ambient on the dielectric properties should not be over‐looked and is expected to play a key role in controlling the stability of dielectric properties of CCTO. This new approach of characterizing the CCTO ceramics can be used as guidelines to eliminate hysteresis due to ambient atmosphere and to produce stable and reproducible dielectric properties useful as capacitors.

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

2019

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“…In 2000, Subramanian et al [1] discovered that CCTO belongs to the family of ACu 3 Ti 4 O 12 (A = Ca, Sr, Ba, Bi 2/3 , Y 2/3 , La 2/3 )-type oxide of pseudo-cubic perovskite-related structure (space group: Im 3 ) with a lattice parameter of 7.391 Å. The huge value of ε remaining constant over a wide range of temperatures from 100 to 400 K for CCTO allows for its use in wide potential applications [2–4]. …”

Section: Introductionmentioning

confidence: 99%

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

2016

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Electroceramic calcium copper titanates (CaCu3Ti4O12, CCTO), with high dielectric permittivities (ε) of approximately 105 and 104, respectively, for single crystal and bulk materials, are produced for a number of well-established and emerging applications such as resonator, capacitor, and sensor. These applications take advantage of the unique properties achieved through the structure and properties of CCTO. This review comprehensively focuses on the primary processing routes, effect of impurity, dielectric permittivity, and deposition technique used for the processing of electroceramics along with their chemical composition and micro and nanostructures. Emphasis is given to versatile and basic approaches that allow one to control the microstructural features that ultimately determine the properties of the CCTO ceramic. Despite the intensive research in this area, none of the studies available in the literature provides all the possible relevant information about CCTO fabrication, structure, the factors influencing its dielectric properties, CCTO immobilization, and sensing applications.

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“…Basically, these two models operate complementarily in CCTO in its various forms, although the origin of the capacitance barriers is different in each case. Some authors relate the origin of these barriers in ceramics to the intergranular phase, although some other structures, like intrinsic twin boundaries, have been suggested. CCTO ceramics have been characterized to present intergranular phases, which are mainly made of cupper oxides, with small amounts of titanium and calcium oxides .…”

Section: Introductionmentioning

confidence: 99%

Deficient or excessive CuO‐TiO₂ phase influence on dielectric properties of CaCu₃Ti₄O₁₂ ceramics

Gelfuso

Uribe

Thomazini

2018

Int J Applied Ceramic Tech

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The influence of the CuO-TiO 2 phase (CT) on dielectric properties of the CCTO ceramic was investigated. CaCu X Ti Y O 12 (CC X T Y O) powders were prepared based on the coprecipitated method, where 2.70 ≤ x ≤ 3.30 and 3.25 ≤ y ≤ 4.75. XRD patterns confirmed the presence of CCTO and also the secondary phases as CuO, TiO 2 , and CaTiO 3 for each sample and aided in its quantification. Scanning Electron Microscopy (SEM) shows secondary phases evolution in the grain boundaries, and its influence on size and morphology of the grains. Impedance spectroscopy measurements showed that the ceramics with lower amount of CuO and TiO 2 phases (CT/deficient ceramics) exhibited the highest ε′ values (2.1 × 10 4 at 1 kHz for CC 2.9 T 3.75 O ceramic). Also, CT/deficient ceramics showed lower tanδ values (0.090 at 1 kHz for CC 2.9 T 3.75 O ceramic) than ceramics prepared with excessive CuO-TiO 2 phase (0.241 at 1 kHz for CC 3.1 T 4.25 O ceramics). The deficiency of CuO and TiO 2 phases associated with high percentage of CCTO and CaTiO 3 phases resulted in ceramics with the higher ε′ values.

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Electrical behavior analysis of n-type CaCu3Ti4O12 thick films exposed to different atmospheres

Cited by 31 publications

References 53 publications

Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

Deficient or excessive CuO‐TiO₂ phase influence on dielectric properties of CaCu₃Ti₄O₁₂ ceramics

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Electrical behavior analysis of n-type CaCu3Ti4O12 thick films exposed to different atmospheres

Cited by 31 publications

References 53 publications

Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

Influence of atmospheres on the dielectric properties of calcium copper titanate ceramics

A Short Review on Copper Calcium Titanate (CCTO) Electroceramic: Synthesis, Dielectric Properties, Film Deposition, and Sensing Application

Deficient or excessive CuO‐TiO2 phase influence on dielectric properties of CaCu3Ti4O12 ceramics

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Deficient or excessive CuO‐TiO₂ phase influence on dielectric properties of CaCu₃Ti₄O₁₂ ceramics