The lowered dielectric loss tangent and grain boundary effects in fluorine-doped calcium copper titanate ceramics

Huang, Xin; Zhang, Huaiwu; Lai, Yuanming

doi:10.1007/s00339-017-0947-9

Cited by 44 publications

(16 citation statements)

References 32 publications

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“…Therefore, at 20 °C, a significantly reduced tan δ in the NbTaAl025 and NbTaAl05 was resulted from their vastly enhanced R gb values. The close relationship between the significant increase in R gb and a reduced tanδ is similar to those report in literature [ 2 , 17 , 30 , 31 , 32 ]. Doping CCTO with only Nb 5+ or Ta 5+ resulted in a significant reduction in the R gb compared to that of the undoped CCTO [ 2 , 18 , 19 ].…”

Section: Resultssupporting

confidence: 91%

“…The temperature stability of ε ′ was improved by doping with Nb 5+ , Ta 5+ , and Al 3+ . The increase in ε ′ in a high-temperature range is usually observed in CCTO-based ceramics [ 19 , 20 , 28 , 29 , 30 , 31 , 32 ]. As shown in the inset, the tan δ of the NbTaAl025 and NbTaAl05 were lower than that of the CCTO ceramic in over the temperature range of −60 to 210 °C.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, improved colossal dielectric permittivity of these oxides can be observed in single and codoped CCTO ceramics [ 1 , 2 , 15 , 17 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. Considering the heteroatomic substitution method, colossal permittivity with low tan δ was reported in (A 5+ , B 3+ ) codoped TiO 2 ceramics such as (Nb 5+ , In 3+ ) [ 1 ], (Nb 5+ , Al 3+ ) [ 35 ], (Nb 5+ , Ga 3+ ) [ 34 ], and (Nb 2+ , Sc 3+ ) [ 36 ] codoped TiO 2 ceramics.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Charge Compensation on Colossal Permittivity and Electrical Properties of Grain Boundary of CaCu3Ti4O12 Ceramics Substituted by Al3+ and Ta5+/Nb5+

et al. 2021

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The effects of charge compensation on dielectric and electrical properties of CaCu3Ti4-x(Al1/2Ta1/4Nb1/4)xO12 ceramics (x = 0−0.05) prepared by a solid-state reaction method were studied based on the configuration of defect dipoles. A single phase of CaCu3Ti4O12 was observed in all ceramics with a slight change in lattice parameters. The mean grain size of CaCu3Ti4-x(Al1/2Ta1/4Nb1/4)xO12 ceramics was slightly smaller than that of the undoped ceramic. The dielectric loss tangent can be reduced by a factor of 13 (tanδ ~0.017), while the dielectric permittivity was higher than 104 over a wide frequency range. Impedance spectroscopy showed that the significant decrease in tanδ was attributed to the highly increased resistance of the grain boundary by two orders of magnitude. The DFT calculation showed that the preferential sites of Al and Nb/Ta were closed together in the Ti sites, forming self-charge compensation, and resulting in the enhanced potential barrier height at the grain boundary. Therefore, the improved dielectric properties of CaCu3Ti4-x(Al1/2Ta1/4Nb1/4)xO12 ceramics associated with the enhanced electrical properties of grain boundaries. In addition, the non-Ohmic properties were also improved. Characterization of the grain boundaries under a DC bias showed the reduction of potential barrier height at the grain boundary. The overall results indicated that the origin of the colossal dielectric properties was caused by the internal barrier layer capacitor structure, in which the Schottky barriers at the grain boundaries were formed.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Charge Compensation on Colossal Permittivity and Electrical Properties of Grain Boundary of CaCu3Ti4O12 Ceramics Substituted by Al3+ and Ta5+/Nb5+

et al. 2021

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“…The coexistence of giant permittivity and low dielectric loss within a dielectric material is of interest because of the increasing demand for such materials in industrial applications 1,2 such as high-energy density devices, dynamic random access memory and microelectronic applications. Many dielectrics with giant permittivity have attracted a great deal of attention and these materials have included CaCu 3 Ti 4 O 12 (CCTO), 1,[3][4][5][6][7][8] Ba(Fe 1/2 B 1/2 )O 3 (B = Nb, Ta, and Sb), 9,10 doped-NiO, 11,12 and trivalent cation-modified SrTiO 3 ceramics. [13][14][15] However, high dielectric loss (>0.1) in the above-mentioned dielectrics limits the practical application of these materials in electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Origin of low dielectric loss and giant dielectric response in (Nb+Al) co‐doped strontium titanate

Cao

Zhou

et al. 2018

J Am Ceram Soc

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(Nb+Al) co‐doped SrTiO3 ceramics with a nominal composition of Sr(Nb0.5Al0.5)xTi1‐xO3 (x = 0, 0.02, 0.04, and 0.06) were fabricated using the conventional solid‐state reaction method; giant permittivity (10500) and low dielectric loss (0.03) were obtained at x = 0.06. Dielectric and impedance spectroscopy, X‐ray photoelectron spectroscopy, and Raman spectroscopy, were employed to study why the dielectric property improved. The results indicate that the giant dielectric response occurs because of the combined effects of the off‐center Ti3+ reorientation and conduction of electrons with the polar ordering structure Ti3+/Ti4+. In contrast, the low dielectric loss can be attributed to electron localization that occurs because of the defect dipole ][Ti4+·e−Vo··−Ti4+·e. These fundamental understandings will benefit the design of doped SrTiO3 ceramics with desired performance.

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“…As our team`s previous work [11][12][13] , CaCu ferrite powders were prepared with a solid-state reaction method. The two kinds of powers were then mixed as the mass ratio of 4:1, then x% Co 2 O 3 was added into the mixture and ball milled for further 10 h to obtain fine powder, and was pressed into pellet.…”

Section: Introduction One Materials With Multiple Properties Such As Dmentioning

confidence: 99%

Influence of Co2O3 additive on electromagnetic properties of NiCuZn/CaCu3Ti4O12 composites

Huang

Zhang

Jia

et al. 2017

Trans. Mat. Res. Soc. Japan

Self Cite

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In order to improve the electromagnetic properties of 80wt%NiCuZn + 20wt% CaCu 3 Ti 4 O 12 composites, Co 2 O 3 as an additive was studied in this work. The effects of Co 2 O 3 content on the electromagnetic properties were investigated, which confirmed that permeability of composites was decreased and cutoff frequency was improved with Co 2 O 3. The nonlinear fitting of permeability dispersion have revealed the relationships between domain wall resonance, spin rotation relaxion mechanisms, and local induced anisotropy, the existence of local induced anisotropy caused by ordering of Co ions could influence the initial permeability. Meanwhile, the dielectric constant was increased with the addition of Co 2 O 3 , and all the samples kept a lower tanδ，which was less than 0.01 at the frequency between 10 7 Hz to 10 8 Hz.

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The lowered dielectric loss tangent and grain boundary effects in fluorine-doped calcium copper titanate ceramics

Cited by 44 publications

References 32 publications

Effects of Charge Compensation on Colossal Permittivity and Electrical Properties of Grain Boundary of CaCu3Ti4O12 Ceramics Substituted by Al3+ and Ta5+/Nb5+

Effects of Charge Compensation on Colossal Permittivity and Electrical Properties of Grain Boundary of CaCu3Ti4O12 Ceramics Substituted by Al3+ and Ta5+/Nb5+

Origin of low dielectric loss and giant dielectric response in (Nb+Al) co‐doped strontium titanate

Influence of Co<sub>2</sub>O<sub>3</sub> additive on electromagnetic properties of NiCuZn/CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> composites

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