Na 1/3 Ca 1/3 Bi 1/3 Cu 3 Ti 4 O 12 : A new giant dielectric perovskite ceramic in ACu 3 Ti 4 O 12 compounds

Kum−onsa, Pornsawan; Thongbai, Prasit; Putasaeng, Bundit; Yamwong, Teerapon; Maensiri, Santi

doi:10.1016/j.jeurceramsoc.2014.11.028

Cited by 51 publications

(24 citation statements)

References 32 publications

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“…CaCu 3 Ti 4 O 12 is classified as a member of the ACu 3 Ti 4 O 12 family, where A can be Ca, Cd, Bi 2/3 , La 2/3 , Y 2/3 , Na 1/2 Bi 1/2 , Na 1/2 La 1/2 , Na 1/2 Y 1/2 , Na 1/2 Sm 1/2 , or Na 1/3 Ca 1/3 Bi 1/3 . In addition to CCTO ceramics, the colossal dielectric response and electrical properties of related CCTO oxides in the ACu 3 Ti 4 O 12 family have been widely investigated.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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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“…its dielectric constant (3) and dielectric loss (tan d) are highly dependent on the various cationic substitutions, such as La and Pr at Ca site or Ta, Cr, and Hf at the Ti site. [7][8][9][10][11][12] The cationic substitution at the Cu site and its concentration in CCTO ceramic affect the dielectric properties because Cu ion is one of the most effective inter-granular dopants for barrier layer capacitors, and it can act as an acceptor ion. 13 Therefore, the Cu 1+ /Cu 2+ ratio and its correlation with oxygen vacancies has great inuence on the dielectric properties of polycrystalline CCTO via the internal barrier layer capacitance (IBLC) mechanism.…”

Section: A Introductionmentioning

confidence: 99%

Tuning the optical and dielectric properties of calcium copper titanate Ca_xCu_3−xTi₄O₁₂ nanopowders

et al. 2015

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“…CCTO exhibited very high dielectric permittivity (e 0 & 10 3 -10 5 ), depending on several factors including sintering time and temperature [3][4][5][6], electrode material [7,8], annealing treatment [9,10], stoichiometry of Ca, Ti, and Cu [1,11,12], and preparation method to produce CCTO powder [13,14]. Giant dielectric properties of related oxides in the family of ACu 3 Ti 4 O 12 compounds, where A = Bi 2/3 , La 2/3 , Y 2/3 , Na 1/2 Bi 1/2 , Na 1/2 La 1/2 , Na 1/2 Y 1/2 , and Na 1/3 Ca 1/3 Bi 1/3 , have also been observed [15][16][17][18][19][20][21][22][23][24][25][26][27]. Generally, CCTO and ACu 3 Ti 4 O 12 ceramics are synthesized via a solid-state reaction (SSR) method [15-18, 23, 26].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, dielectric properties, and influences oxygen vacancies have on electrical properties of Na1/2Bi1/2Cu3Ti4O12 ceramics prepared by a urea combustion method

Tuichai

Danwittayakul

Yamwong

et al. 2015

J Sol-Gel Sci Technol

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The influences of oxygen vacancies on the dielectric and electrical properties of Na 1/2 Bi 1/2 Cu 3 Ti 4 O 12 ceramics prepared using a urea combustion method were investigated via an annealing treatment in an O 2 atmosphere. Interestingly, a single Na 1/2 Bi 1/2 Cu 3 Ti 4 O 12 phase was successfully prepared using a low calcination temperature of 800°C. High dielectric permittivity (e 0 ) and dense ceramic microstructure were achieved by sintering compacted powders at a low temperature of 980°C. e 0 and the loss tangent (tand) were decreased by annealing in an O 2 atmosphere. This was associated with the oxygen vacancy concentration at grain boundaries (GBs). A decrease in low-frequency tand was caused by enhancement of GB resistance, which was due to filling oxygen vacancies at GBs. A slight decrease in e 0 was attributed to the reduction in GB capacitance. Through use of an annealing process, the conduction activation energy at GBs was increased, whereas the conduction activation energy inside the grains remained unchanged. These results clearly indicated the effect of oxygen vacancy concentration at the GBs on the giant dielectric response and correlated GB response. Graphical Abstract0 3.0x10 6.0x10 9.0x10 1.2x10 1.5x10 1.8x10 0.0 .0 0 4 0 4 0 4 0 5 0 5 0 5 NB NB NB NB @ 5.0x10 4 CTO-1 CTO-1O 2 CTO-2 CTO-2O 2 100 o C

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Na 1/3 Ca 1/3 Bi 1/3 Cu 3 Ti 4 O 12 : A new giant dielectric perovskite ceramic in ACu 3 Ti 4 O 12 compounds

Cited by 51 publications

References 32 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

Tuning the optical and dielectric properties of calcium copper titanate Ca_xCu_3−xTi₄O₁₂ nanopowders

Synthesis, dielectric properties, and influences oxygen vacancies have on electrical properties of Na1/2Bi1/2Cu3Ti4O12 ceramics prepared by a urea combustion method

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Na 1/3 Ca 1/3 Bi 1/3 Cu 3 Ti 4 O 12 : A new giant dielectric perovskite ceramic in ACu 3 Ti 4 O 12 compounds

Cited by 51 publications

References 32 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

Tuning the optical and dielectric properties of calcium copper titanate CaxCu3−xTi4O12 nanopowders

Synthesis, dielectric properties, and influences oxygen vacancies have on electrical properties of Na1/2Bi1/2Cu3Ti4O12 ceramics prepared by a urea combustion method

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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

Tuning the optical and dielectric properties of calcium copper titanate Ca_xCu_3−xTi₄O₁₂ nanopowders