Microstructural and dielectric properties of donor doped (La3+) CaCu3Ti4O12 ceramics

Prakash, B. Shri; Varma, K. B. R.

doi:10.1007/s10854-006-0037-9

Cited by 51 publications

(35 citation statements)

References 26 publications

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“…[19], and La 2/3 Cu 3 Ti 4 O 12 [21] ceramics, respectively. The investigation of electrical properties of GBs indicates that the GBs of NCTTO ceramics are insulating layers with high conduction activation energies compared to grains.…”

Section: Resultsmentioning

confidence: 99%

“…Besides CCTO ceramics, there are several reports on the giant ε properties of CCTO-related materials, i.e., ACu 3 Ti 4 O 12 phases where A = Sr, Cd, Bi 2/3 , La 2/3 , Y 2/3 , Na 1/2 Bi 1/2 , and the rare earths [16][17][18][19][20][21][22][23]. Hao et al [24] found that NaCu 3 Ti 3 SbO 12 , having a perovskite-related crystallographic structure, can exhibit a giant value of ε (∼10 4 below 100 kHz).…”

Section: Introductionmentioning

confidence: 99%

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Electrical responses and dielectric relaxations in giant permittivity NaCu3Ti3TaO12 ceramics

et al. 2012

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Dielectric relaxations and electrical responses in NaCu 3 Ti 3 TaO 12 ceramics were investigated as a function of temperature. NaCu 3 Ti 3 TaO 12 ceramics exhibit giant dielectric constants with values of ε ∼ 1.45-2.08 × 10 4 . Two sets of thermally activated dielectric relaxations were observed in low and high temperature ranges. Sintering conditions have an insignificant influence on the microstructure of NaCu 3 Ti 3 TaO 12 ceramics, and have a slight impact on their ε values. Thermally activated electrical responses of grains and grain boundaries have been studied at different temperatures by using complex admittance and impedance spectroscopy analyses, respectively. The low temperature relaxation mechanism is found to correlate closely with electrical response of semiconducting grains; whereas the apparent high ε values are attributed to electrical response of insulating grain boundaries. These results support the internal barrier layer capacitor model to explain the giant dielectric properties of NaCu 3 Ti 3 TaO 12 ceramics. Additionally, high temperature relaxation may be attributed to the sampleelectrode effect and/or defect ordering. N. Sangwong · W. Somphan · P. Thongbai ( ) Materials Science and Nanotechnology Program,

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrical responses and dielectric relaxations in giant permittivity NaCu3Ti3TaO12 ceramics

et al. 2012

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“…In recent years, CaCu 3 Ti 4 O 12 [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] and related ACu 3-Ti 4 O 12 ceramic oxides (A = La 2/3 [3,6,16], Bi 2/3 [3,16,17], Y 2/3 [3,18], Na 1/2 Sm 1/2 [3,19], Na 1/2 Bi 1/2 [3,[20][21][22][23][24], Na 1/2 La 1/2 [25,26], Na 1/2 Y 1/2 [27,28], etc.) have received considerable attention due to their very high dielectric constants (e 0 * 10 3 -10 5 ) over the temperature range from 100 to 600 K. These ceramics also exhibited nonlinear current-voltage (or nonlinear current density-electric field, J-E) properties [4,7,19,23,26].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, MLCCs can be reduced in size by replacing dielectric layers with a relative high-permittivity dielectric material. Unfortunately, the loss tangent (tand) values of CaCu 3 Ti 4 O 12 and related ceramic oxides are still higher than the standard value for capacitor applications, making them unsuitable for capacitor applications [1,5,6,8,10,13,23,28,29]. Investigation to reduce tand value is an important and urgent issue that should be intensively performed [8,10,14,21,[29][30][31].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Y doping ions on microstructure, dielectric response, and electrical properties of Ca1−3x/2Y x Cu3Ti4O12 ceramics

Boonlakhorn

Kidkhunthod

Putasaeng

et al. 2015

J Mater Sci: Mater Electron

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The effects of Y 3? doping ions on ceramic microstructure, dielectric response, and electrical properties of Ca 1-3x/2 Y x Cu 3 Ti 4 O 12 (x = 0, 0.05, 0.10, and 0.15) ceramics prepared by a modified sol-gel method were investigated. A grain size of Ca 1-3x/2 Y x Cu 3 Ti 4 O 12 was reduced by Y 3? ions due to a solute drag effect. Substitution of CaCu 3 Ti 4 O 12 ceramics with suitable Y 3? concentration of 5 at. % can improve dielectric properties with high-dielectric permittivity of e 0 * 1.37 9 10 4 and low tand * 0.05 at 1 kHz. The results revealed that the relationship of the mean grain size and e 0 cannot be formulated. Using impedance spectroscopy analysis, the grain boundary resistance (R gb ) of Ca 1-3x/2 Y x Cu 3 Ti 4 O 12 ceramics was found to be strongly enhanced by Y 3? doping ions with x = 0.05. With further increasing x from 0.05 to 0.15, R gb decreased. While the grain resistance tended to increase with increasing Y 3?concentration (x = 0-0.15). Variation of a low-frequency tand value in all Ca 1-3x/2 Y x Cu 3 Ti 4 O 12 ceramics due to the influence of Y 3? substitution was well consistent with their changes in R gb values. Non-Ohmic properties of Ca 1-3x/2 Y x Cu 3 Ti 4 O 12 ceramics were also investigated.

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A comparative study on dielectric, structure, and thermal behavior of micro‐ and nano‐sized CCTO in nylon 6,9 matrix

2015

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Calcium copper titanium oxalate CaCu3Ti4O12 (CCTO) particles as a filler with both micro‐ and nano‐sized into nylon 6,9 polymer have been investigated under structural, thermal, and dielectric properties to find that particle satisfy all the same. Micro‐sized CCTO particles (point out as mCCTO) was synthesized using solid‐state route using ball milling and nano‐sized CCTO particles (point out as nCCTO) was synthesized using complex oxalate precursor route. Fabrication of nylon 6,9/CCTO composite for both micro‐ and nano‐sized CCTO particles were employed separately into nylon 6,9 matrix and examined comparatively. The composite containing 20 vol% of nCCTO achieve 24.5 dielectric permittivity at 100 Hz in room temperature that was significantly higher than mCCTO which was 14 at the same condition. From the structural analysis, we obtained that the nCCTO was well dispersed in the matrix medium, whereas the mCCTO were also dispersed with some agglomeration that was the reason for the interaction failure between the particles and matrix material. The dielectric permittivity results obtained from this study specify that the composite containing nano‐sized CCTO particles may be suitable for energy storage devices and in the higher temperature sensor applications. POLYM. COMPOS., 38:927–935, 2017. © 2015 Society of Plastics Engineers

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Microstructural and dielectric properties of donor doped (La3+) CaCu3Ti4O12 ceramics

Cited by 51 publications

References 26 publications

Electrical responses and dielectric relaxations in giant permittivity NaCu3Ti3TaO12 ceramics

Electrical responses and dielectric relaxations in giant permittivity NaCu3Ti3TaO12 ceramics

Effects of Y doping ions on microstructure, dielectric response, and electrical properties of Ca1−3x/2Y x Cu3Ti4O12 ceramics

A comparative study on dielectric, structure, and thermal behavior of micro‐ and nano‐sized CCTO in nylon 6,9 matrix

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