Study of structural, dielectric and electrical conduction behaviour of Gd substituted CaCu3Ti4O12 ceramics

Kashyap, Raman; Thakur, O. P.; Tandon, R. P.

doi:10.1016/j.ceramint.2011.11.085

Cited by 53 publications

(18 citation statements)

References 21 publications

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“…The values of lattice parameter (a) were found to be 7.3921 ± 0.0001, 7.3907 ± 0.0016, 7.3906 ± 0.0014, and 7.3857 ± 0.0018 Å for the Ca 1-3x/2 Y x Cu 3 Ti 4 O 12 ceramics with x = 0, 0.05, 0.10, and 0.15, respectively. These values are well comparable to the values reported in literature [3,5,12,14,15] and JCPDS 75-2188 for 7.391 Å . Additionally, it is likely that the lattice parameter tends to decrease with increasing Y 3?…”

Section: Introductionsupporting

confidence: 93%

“…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%

“…, and Eu 3? ions were substituted [6,11,12,14,15]. The densities of all the sintered ceramics were measured using the Archimedes method.…”

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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Section: Introductionsupporting

confidence: 93%

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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“…Thus, while the addition of compounds such as TeO 2 , Cerium, Cesium, and Eu 2 O 3 greatly reduce permittivity material [7][8][9], oxides such as P 2 O 5 , GeO 2 , Lu 2 O 3 and V 2 O 3 increase the dielectric constant [10][11][12][13]. When doping is carried out by partial substitution of Ca or Ti sites, we have generally a reduction of the permittivity of the material by substitution on the sites of the first one (Gd et Pr) [14,15] and an increase on the sites of the second one (Nb, Fe, Co, Ni) [16][17]. In addition, permittivities of these compounds are little more than 40,000 at room temperature and at 1 kHz.…”

Section: Introductionmentioning

confidence: 99%

Dielectrics Properties and Temperature Dependence of Electron Spin Resonance of Doped Molybdenum CCTO

Kouassi¹

2017

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Abstract:The role perovskite-type CaCu 3 Ti 4 O 12 (CCTO) dope by molybdenum (Mo) on the microstructure, dielectric properties and the temperature dependence of Electron Spin Resonance (ESR) has been investigated in this work. The solid state reaction has been used to synthesize CCTO ceramic samples. Substitution on Ti-site by Mo helps to increase the grain size of samples and therefore increase the dielectric constant according to the IBLC theory. There is no great difference between the ESR spectra of pure CCTO and CCTO doped by Molybdenum as a function of temperature. For a given temperature, ESR signal spectrum intensity increases as the Mo content increases. The magnetic susceptibility varies according to the composition only when the temperature is higher than 70K. The antiferromagnetic character of the CCTO decreases when the Mo content increases.

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“…This behavior might be desirable for varistor applications. 13,18,19 SrTiO 3 (ST) has a low dielectric loss as an incipient ferroelectric, though it does not possess attractive properties in the pure form. 20 Therefore, it would be interesting to add a small amount of ST to CCTO and investigate the dielectric and electric properties of such composite materials.…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Nonohmic Properties of CaCu3Ti4O12/SrTiO3 Ceramics

Xue

Liu

Chen

et al. 2015

Journal of Elec Materi

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In this work, (1 À x)CaCu 3 Ti 4 O 12 -xSrTiO 3 [(1 À x)CCTO/xST, x = 0% to 2%] ceramic samples were prepared by the solid-state reaction method. The dielectric and electrical properties of CaCu 3 Ti 4 O 12 (CCTO) and CaCu 3 Ti 4 O 12 /SrTiO 3 (CCTO/ST) ceramics were investigated. The results show that a small amount of Sr 2+ can enter the lattice of CCTO. The mean grain size of the ceramic samples increased greatly for x = 0.5% and then decreased for x = 0.75% to 2%. ST addition and Sr 2+ preferential occupancy in CCTO grains should be responsible for the change of the microstructure. Interestingly, the dielectric constant (e) of the 0.5% ST-added sample increased significantly while the dielectric loss (tan d) remained low. With further increase of the ST content, the e and tan d values of the CCTO ceramics decreased monotonically while the nonlinear current-voltage properties were significantly enhanced. The change in the potential barrier height is thought to be the main cause for the opposite behaviors in the dielectric properties and nonohmic characteristics.

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Study of structural, dielectric and electrical conduction behaviour of Gd substituted CaCu3Ti4O12 ceramics

Cited by 53 publications

References 21 publications

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

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

Dielectrics Properties and Temperature Dependence of Electron Spin Resonance of Doped Molybdenum CCTO

Dielectric and Nonohmic Properties of CaCu3Ti4O12/SrTiO3 Ceramics

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