Dielectric properties of the Ca1−xLaxCu3Ti4−xCoxO12 system (x=0.10, 0.20 and 0.30) synthesized by semi-wet route

Mandal, K. D.; Kumar, Alok; Kumar, Devendra

doi:10.1016/j.jallcom.2008.12.007

Cited by 37 publications

(11 citation statements)

References 21 publications

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“…A lot of research work has been done on partial substitution of Cu and Ti ions in CCTO ceramic in order to improve the dielectric properties for understanding the origin of dielectric response in these materials [10,11]. In the previous work, various substitutions were made on different sites of CCTO to investigate the effect of substitution on dielectric properties, e.g., Ca by La [12], Cu by Mn [13] and Ti by Ni [14]. In the present communication, La 3+ , Mn 2+ and Ni 2+ cations doped calcium copper titanate, CCTO, at higher concentration level (5 mol% and 10 mol%), were synthesized by semi-wet route at relatively lower temperature and abbreviated as CR1 and CR2 for 5 mol% and 10 mol%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Singh

Kumar

et al. 2013

J Adv Ceram

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Abstract:The effect of La 3+ , Mn 2+ and Ni 2+ doped calcium copper titanate, CaCu 3 Ti 4 O 12 (CCTO), at higher concentrations (CR1 and CR2 with 5 mol% and 10 mol%, respectively), has been examined by semi-wet route at relatively lower temperature. This semi-wet route employs citrate-nitrate gel chemical method using TiO 2 solid powders. X-ray diffraction (XRD) analysis confirms the formation of single phase in the doped samples sintered at 900 ℃ for 8 h. Scanning electron micrographs (SEM) show that the average grain size for CR2 is larger than that of CR1 composition. The energy dispersive X-ray spectroscopy (EDX) is used to study the percentage compositions of different ions present in both ceramics. Dielectric constant (ε r ) and dielectric loss (tanδ) values of CR1 are comparatively higher than those of CR2 ceramic at all measured frequencies and temperatures. The nature of temperature-dependent relaxation behavior of the ceramics is also studied by impedance, modulus spectroscopic analysis and confirms Maxwell-Wagner relaxation.

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Section: Introductionmentioning

confidence: 99%

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Singh

Kumar

et al. 2013

J Adv Ceram

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“…The dielectric constant of CCTO is almost temperature independent, with a temperature range between 100 K and 600 K [2][3][4]. It also has a very small frequency dependence of up to 10 5 Hz [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…It also has a very small frequency dependence of up to 10 5 Hz [5,6]. Such weak temperature and frequency dependencies for CCTO's dielectric constant have attracted much researcher interest because it is an ideal material in a wide range of applications, especially in microelectronics [2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…To date, synthesis of CCTO has been performed by either mixed oxides [1][2][3]7], chemical [4,[9][10][11], or mechanical routes [12]. CCTO ceramics are most often produced through conventional mixed oxide methods.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, the sinterability of the powders is considerably reduced [9][10][11]13,14]. Furthermore, it should be noted that in order to achieve the desired CCTO phase, calcination at elevated temperatures is crucial [4,9]. In spite of the suitable properties achieved through this method [4], broader application of chemical synthesis is also limited due to high precursor costs.…”

Section: Introductionmentioning

confidence: 99%

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Structural and phase evolution in mechanically alloyed calcium copper titanate dielectrics

Alizadeh

Ardakani

Amini

et al. 2013

Ceramics International

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Nanocrystalline calcium-copper-titanate (CCTO) dielectric powders were prepared by mechanical alloying. Phase transformations and structural evolution of the mechanically activated powders were investigated through the Rietveld refinement of the X-ray diffraction results. The crystallite size, lattice strain, and weight fraction of individual phases were estimated based on crystal structure refinement. Furthermore, the microstructural properties and thermal behavior of the milled powders were investigated by Transmission Electron Microscopy (TEM) and Differential Thermal Analysis (DTA), respectively. It was found that CCTO nanocrystals can be successfully synthesized after the amorphization of the initial crystalline materials. Semi-spherical nano-size particles were developed after sufficient milling time. Formation of an amorphous phase during the milling cycle was confirmed by the presence of the glass transition and crystallization peaks in the thermal analysis profiles.

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Dielectric and Electrical Properties of Undoped and Fe‐Doped Yttrium Copper Titanate

Sharma

Singh

Mandal

2015

Processing and Properties of Advanced Ceramics and Composites VII

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Dielectric properties of the Ca1−xLaxCu3Ti4−xCoxO12 system (x=0.10, 0.20 and 0.30) synthesized by semi-wet route

Cited by 37 publications

References 21 publications

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Dielectric behavior of CaCu3Ti4O12 electro-ceramic doped with La, Mn and Ni synthesized by modified citrate-gel route

Structural and phase evolution in mechanically alloyed calcium copper titanate dielectrics

Dielectric and Electrical Properties of Undoped and Fe‐Doped Yttrium Copper Titanate

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