Microstructure and enhanced dielectric response in Mg doped CaCu3Ti4O12 ceramics

Sun, Li; Zhang, Ru; Wang, Zhenduo; Cao, Ensi; Zhang, Yongjia; Ju, Lin

doi:10.1016/j.jallcom.2015.12.143

Cited by 73 publications

(30 citation statements)

References 24 publications

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“…and Swatsitang et al . Sun et al . prepared CaCu 3−x Mg x Ti 4 O 12 ceramics with high ϵ′ and very low tanδ by the sol−gel method.…”

Section: Doping Of Cctomentioning

confidence: 99%

“…Mg doped CCTO was studied by Sun et al [68] and Swatsitang et al [69] Sun et al [68] prepared CaCu 3À x Mg x Ti 4 O 12 ceramics with high ɛ' and very low tanδ by the solÀ gel method. Very high values of relative permittivity and low values for dielectric loss were obtained for Mg doped CCTO ceramics : ɛ' of 2.52 × 10 4 and tanδ of~0.017 at 1 kHz and RT have been achieved for ceramics sintered at 1080°C for 8 h in the air atmosphere.…”

Section: Doping Of Ccto By One Elementmentioning

confidence: 99%

“…Ren et al [97] co-doped CaCu 3 Ti 4 O 12 by Al 3 + and Bi 3 + elements to improve the electrical properties and enhance the varistor [60] Sr x = 0.2 > 10 4~0 .3~20 μm [86] Co x = 0.6 6 × 10 4 0.15 75 μm [57] SnO 2 2 mol%~21,250 0.04 3-5 μm [87] Mg x = 0.1~2.52 × 10 4 0.017~2-20 μm [68] Y x = 0.05~31,125~0.14~55 μm [82] Zr x = 0.05~22,260~0.02~32 μm [82] Ta x = 0.05~17,500~0.01~4 μm [82] Mg x = 0.05~3 × 10 4~0 .013~45.65 μm [88] Y x = 0.05~8 × 10 3~0 .013~2.52 μm [88] Sn property of CCTO. The authors observed that the grain size homogenization was enhanced with co-doping.…”

Section: Co-doping Of Ccto By Two Elementsmentioning

confidence: 99%

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From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

et al. 2019

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Investigations focusing on electrical energy storage capacitors especially the dielectric ceramic capacitors for high energy storage density are attracting more and more attention in the recent years. Ceramic capacitors possess a faster charge‐discharge rate and improved mechanical and thermal properties compared with other energy storage devices such as batteries. The challenge is to obtain ceramic capacitors with outstanding mechanical, thermal and storage properties over large temperature and frequencies ranges. ABO 3 as a type of perovskites showed a strong piezoelectric, dielectric, pyroelectric, and electro‐optic properties useful as energy storage and environmental devices. CaCu 3 Ti 4 O 12 (CCTO) perovskite with cubic lattice (Im3 symmetry) was discovered to have a colossal dielectric constant (10 4 ) that is stable over a wide range of frequencies (10 Hz–1 MHz) and temperature independence (100–300 K). The origin of this high dielectric constant is not fully established, specially because it is the same for single crystal and thin films. In this review, the history of CCTO will be introduced. The synthesis and the sintering approaches, the dopant elements used as well as the applications of CCTO will be reported. In addition to dielectrical properties useful to energy storage devices; CCTO could serve as photocatalytic materials with a very good performance in visible light.

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“…and Swatsitang et al . Sun et al . prepared CaCu 3−x Mg x Ti 4 O 12 ceramics with high ϵ′ and very low tanδ by the sol−gel method.…”

Section: Doping Of Cctomentioning

confidence: 99%

Section: Doping Of Ccto By One Elementmentioning

confidence: 99%

Section: Co-doping Of Ccto By Two Elementsmentioning

confidence: 99%

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From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

et al. 2019

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“…A large number of giant‐dielectric materials with very high dielectric permittivities (ε′≈10 3 ‐10 6 ) have been investigated because giant‐dielectric materials are considered potentially useful in various electronic applications as well as in high energy‐dense storage applications . Recently, Hu et al .…”

Section: Introductionmentioning

confidence: 99%

Surface barrier layer effect in (In + Nb) co‐doped TiO₂ ceramics: An alternative route to design low dielectric loss

et al. 2017

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Giant dielectric permittivity (e 0 ) with low loss tangent (tand) was reported in (In + Nb) co-doped TiO 2 ceramics. Either of electron-pinned defect-dipole or internal barrier layer capacitor model was proposed to be the origin of this high dielectric performance. Here, we proposed an effectively alternative route for designing low-tand in co-doped TiO 2 ceramics by creating a resistive outer surface layer. A pure rutile-TiO 2 phase with a dense microstructure and homogeneous dispersion of dopants was achieved in (In + Nb) co-doped TiO 2 ceramics prepared by a simple sol-gel method. Two giant dielectric responses were observed in low-and high-frequency ranges, corresponding to extremely high e 0 %10 6 -10 7 and large e 0 %10 4 -10 5 , respectively. After annealing in air, a low-frequency dielectric response disappeared and could be restored by removing the outer surface of the annealed sample, indicating the dominant electrode effect in the initial sample. Annealing can cause improved dielectric properties with a temperature-and frequency-independent e 0 value of %1.9 9 10 4 and cause a decrease in tand from 0.1 to 0.035. High dielectric performance in (In 0.5 Nb 0.5 ) x Ti 1Àx O 2 ceramics can be achieved by eliminating the electrode effect and forming a resistive outer surface layer. K E Y W O R D Sdielectric materials/properties, dopants/doping, electrical properties, solgel, titanium dioxide

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“…Wang et al [39] also reported that the tanδ values of CCTO ceramics prepared by a sol-gel method can be reduced by doping with K + ions. Furthermore, it was also widely reported that substitution of Mg 2+ ions into the CCTO structure can effectively decrease tanδ [34,40,41]. Most recently, Swatsitang and Putjuso [42] showed a decrease in the tanδ values of CCTO ceramics by doping with Cr 3+ ions.…”

Section: Resultsmentioning

confidence: 95%

Significantly improved non-ohmic and giant dielectric response in CaCu₃Ti₄O₁₂ ceramics by incorporating Portland cement

Phromviyo

Sirikamalat

Chanlek

et al. 2020

Mater. Res. Express

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The giant dielectric and nonlinear current-voltage properties of CaCu 3 Ti 4 O 12 (CCTO) incorporating Portland cement (PC) were investigated. Analysis revealed that the microstructure of the CCTO/PC ceramics was highly dense. Using the microstructure analysis and theoretical calculation, the elements in PC (i.e., Al, Si, Fe, K, Cr, and Mg) can substitute into the CCTO structure, giving rise to enhanced electrical properties of the grains and grain boundaries. As a result, the giant dielectric and nonlinear current-voltage properties of CCTO/PC were significantly improved. The low-frequency loss tangent of CCTO/PC was greatly reduced, by a factor of 10, while the dielectric permittivity of the ceramics was still large (∼10 4 ) over a frequency range of 10 2 -10 6 Hz. Interestingly, the nonlinear coefficient (α) and electric field breakdown (E b ) of the CCTO/PC ceramics were greatly enhanced by factors of 2 and 30, respectively. Impedance spectroscopy analysis revealed large increases in α and E b , as well as a decrease in the loss tangent due to a significant increase in the grain boundary resistance of CCTO/PC ceramics. Changes in giant dielectric and nonlinear electrical properties can be well described by the internal barrier layer capacitor model based on space charge polarization at the internal interfaces.

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Microstructure and enhanced dielectric response in Mg doped CaCu3Ti4O12 ceramics

Cited by 73 publications

References 24 publications

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

Surface barrier layer effect in (In + Nb) co‐doped TiO₂ ceramics: An alternative route to design low dielectric loss

Significantly improved non-ohmic and giant dielectric response in CaCu₃Ti₄O₁₂ ceramics by incorporating Portland cement

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Microstructure and enhanced dielectric response in Mg doped CaCu3Ti4O12 ceramics

Cited by 73 publications

References 24 publications

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

From Synthesis to Applications: Copper Calcium Titanate (CCTO) and its Magnetic and Photocatalytic Properties

Surface barrier layer effect in (In + Nb) co‐doped TiO2 ceramics: An alternative route to design low dielectric loss

Significantly improved non-ohmic and giant dielectric response in CaCu3Ti4O12 ceramics by incorporating Portland cement

Contact Info

Product

Resources

About

Surface barrier layer effect in (In + Nb) co‐doped TiO₂ ceramics: An alternative route to design low dielectric loss

Significantly improved non-ohmic and giant dielectric response in CaCu₃Ti₄O₁₂ ceramics by incorporating Portland cement