High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases

Subramanian, M. A.; Liu, Dong; Duan, Ning; Reisner, Barbara A.; Sleight, A.W.

doi:10.1006/jssc.2000.8703

Cited by 1,992 publications

(1,283 citation statements)

References 5 publications

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“…The data are well explained within the Im3 space group at both low and high temperature, confirming the absence of phase transitions and distortions in the average structure, in quantitative agreement with earlier results. 1 Typical PDFs of CCTO both from neutron diffraction and X-ray diffraction experiments are shown in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

“…The system is an antiferromagnetic insulator below T N = 25 K, as indicated by transport, neutron diffraction, and Raman studies. 1,2,6 Numerous proposals have been put forward to uncover the origin of the giant dielectric response in CCTO, including both intrinsic and extrinsic mechanisms. Intrinsic mechanisms comprise those referring to a lattice instability resulting in ferroelectric or relaxor-like behavior, coupled with a highly correlated electronic ground state.…”

Section: Introductionmentioning

confidence: 99%

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Temperature dependent total scattering structural study of CaCu₃Ti₄O₁₂

Božin¹,

Petkov²,

Barnes³

et al. 2004

J. Phys.: Condens. Matter

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X-ray and neutron powder diffraction data as a function of temperature are analyzed for the colossal dielectric constant material CaCu3Ti4O12. The local structure is studied using atomic pair distribution function analysis. No evidence is found for enhanced oxygen displacement parameters suggesting that short-range octahedral tilt disorder is minimal. However, an unusual temperature dependence for the atomic displacement parameters of calcium and copper is observed. Temperature dependent modeling of the structure, using bond valence concepts, suggests that the calcium atoms become underbonded below approximately 260 K, which provides a rationale for the unusually high Ca displacement parameters at low temperature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Temperature dependent total scattering structural study of CaCu₃Ti₄O₁₂

Božin¹,

Petkov²,

Barnes³

et al. 2004

J. Phys.: Condens. Matter

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show abstract

“…A wide variety of cations can occupy the A-, B-and C-sites, and various partial substitutions are possible on each of these sites [1][2][3][4][5][6]. Many interesting properties have been found in these compounds, leading to potential applications in various fields.…”

Section: Introductionmentioning

confidence: 99%

“…Many interesting properties have been found in these compounds, leading to potential applications in various fields. For instance, CaCu 3 Ti 4 O 12 and CaMn 3−x Cu x Mn 4 O 12 show an anomalously high dielectric constant and a giant magneto-resistance, respectively [4,5,[7][8][9]; LaCu 3 Fe 4 O 12 is a negative thermal expansion material [10]; and CaCu 3 Ru 4 O 12 exhibits high metallic electrical conductivity [11,12]. Figure 1 shows the crystal structure of CaCu 3 Ru 4 O 12 .…”

Section: Introductionmentioning

confidence: 99%

Element Strategy Using Ru-Mn Substitution in CuO-CaCu3Ru4O12 Composite Ceramics with High Electrical Conductivity

et al. 2017

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CaCu 3 Ru 4−x Mn x O 12 bulks with various substitution amounts x and sintering additive CuO (20 vol.%) were prepared, and the influence of x on the electrical conductivity in a wide temperature range (8-900 K) was investigated. Microstructural observations showed an enhancement of bulk densification upon Mn substitution. Although the resistivity increased with increasing x, the resistivity was as low as a few mΩcm even in the sample with x = 2.00, where half of Ru is substituted by Mn. This high conductivity despite the loss of Ru 4d conduction following the substitution is explained by the A-site (Cu 2+ ) conduction in CaCu 3 Ru 4−x Mn x O 12 . The thermopower of CaCu 3 Ru 4−x Mn x O 12 was found to be influenced by the substitution, and a sign inversion was observed in the substituted samples at low temperature. The partial substitution of Ru by Mn in CaCu 3 Ru 4 O 12 enables the reduction of the materials cost while maintaining good electrical conductivity for applications as a conducting device component.

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“…Recently, much attention has been paid to an unusual cubic perovskite oxide material CaCu 3 Ti 4 O 12 (CCTO), due to its high dielectric constant (10 4 -10 5 ) and good stability over a wide temperature range from 100 K to 600 K [1][2][3][4]. The large dielectric constant is very unusual because it does not show ferroelectric behavior.…”

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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High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases

Cited by 1,992 publications

References 5 publications

Temperature dependent total scattering structural study of CaCu₃Ti₄O₁₂

Temperature dependent total scattering structural study of CaCu₃Ti₄O₁₂

Element Strategy Using Ru-Mn Substitution in CuO-CaCu3Ru4O12 Composite Ceramics with High Electrical Conductivity

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

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High Dielectric Constant in ACu3Ti4O12 and ACu3Ti3FeO12 Phases

Cited by 1,992 publications

References 5 publications

Temperature dependent total scattering structural study of CaCu3Ti4O12

Temperature dependent total scattering structural study of CaCu3Ti4O12

Element Strategy Using Ru-Mn Substitution in CuO-CaCu3Ru4O12 Composite Ceramics with High Electrical Conductivity

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

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Temperature dependent total scattering structural study of CaCu₃Ti₄O₁₂

Temperature dependent total scattering structural study of CaCu₃Ti₄O₁₂