Dielectric properties of CaCu3Ti4O12 based multiphased ceramics

Guillemet‐Fritsch, Sophie; Lebey, Thierry; Boulos, Madona; Durand, Bernard

doi:10.1016/j.jeurceramsoc.2005.01.055

Cited by 125 publications

(52 citation statements)

References 26 publications

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“…First of all, it is important to notice that such huge values of permittivity have never been reported before for barium titanate based materials. These permittivity values are even higher than the ones of the so-called giant dielectric permittivity CaCu 3 Ti 4 O 12 (CCT) materials [14,15].…”

Section: Resultsmentioning

confidence: 83%

Colossal dielectric permittivity of BaTiO3-based nanocrystalline ceramics sintered by spark plasma sintering

et al. 2008

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In pursuit of high permittivity materials for electronic application, there has been a considerable interest recently in the dielectric properties of various perovskite oxides like calcium copper titanate or lanthanum doped barium titanate. When processed in a particular way, this later material present at ambient temperature and at f= 1 kHz unusual interesting dielectric properties, a so called "colossal" permittivity value up to several 10 6 with relatively low dielectric losses. Moreover and contrary to what is classically expected and evidenced for this type of materials, no temperature dependence is observed. This behavior is observed in nanopowders based ceramics. An assumption to explain the observed properties is proposed. These results have important technological applications, since these nanoceramics open a new route to the fabrication of very thin dielectric films.

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Section: Resultsmentioning

confidence: 83%

Colossal dielectric permittivity of BaTiO3-based nanocrystalline ceramics sintered by spark plasma sintering

et al. 2008

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“…The presence of these additional phases gives to this multiphased material an interesting dielectric behaviour, different from the one observed in pure CCT materials. Huge relative permittivity values and relatively low losses are measured in the corresponding sintered ceramics [5].…”

Section: Experimental Partmentioning

confidence: 96%

Soft chemistry synthesis of the perovskite CaCu3Ti4O12

Marchin

Guillemet‐Fritsch

Durand

2008

Progress in Solid State Chemistry

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. AbstractThe perovskite CaCu 3 Ti 4 O 12 (CCT) has been obtained after calcination of oxalate precursors at 900e 1000 C in air. Those precursors are prepared using a soft chemistry method, the coprecipitation. The oxalate powders consist of disk-like particles of 2e3 mm diameter and 300e400 nm thickness. By varying the ratio of the initial amounts of metal chlorides, additional phases (CaTiO 3 , TiO 2 and CuO) could be obtained besides CCT. The corresponding multiphased ceramics present improved dielectric properties.

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“…Guillemet-Fritsch et al 11 point out that Cu 2+ cations are reduced to Cu + at r~ 1000 °C and affirm that due to a possible liquidus temperature below 1000 °C in CuO-rich region, pure CuO cannot be treated higher than 1000 °C. Lu et al 10 proposed that in air CuO would not melt but decomposes at 1031 °C into Q12O.…”

Section: Introductionmentioning

confidence: 98%

Experimental determination of the eutectic temperature in air of the CuO–TiO2 pseudobinary system

Rubia

Reinosa

Leret

et al. 2012

Journal of the European Ceramic Society

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Eutectic temperature and composition in the CuO-Ti0 2 pseudobinary system have been experimentally determined in air by means differential thermal analysis (DTA), thermogravimetry (TG) and hot-stage microscopy (HSM). Samples of the new eutectic composition treated at different temperatures have been characterized by X-ray diffraction (XRD) and X-ray absorption near-edge structural spectroscopy (XANES) to identify phases and to determine the Cu valence state, respectively. The results show that the eutectic temperature in air is higher by 100 °C (~1000 °C) for a Ti-richer composition (X Ti02 = 25 mol%) than the one calculated in the literature. The reduction of Cu 2+ to Cu + takes places at about 1030 °C. The existence of Cu 2 Ti0 3 and Cu 3 Ti0 4 has been confirmed by XRD in the temperature range between 1045 and 1200 °C.

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Dielectric properties of CaCu3Ti4O12 based multiphased ceramics

Cited by 125 publications

References 26 publications

Colossal dielectric permittivity of BaTiO3-based nanocrystalline ceramics sintered by spark plasma sintering

Colossal dielectric permittivity of BaTiO3-based nanocrystalline ceramics sintered by spark plasma sintering

Soft chemistry synthesis of the perovskite CaCu3Ti4O12

Experimental determination of the eutectic temperature in air of the CuO–TiO2 pseudobinary system

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