Origin of giant permittivity in Ta, Al co-doped TiO2: Surface layer and internal barrier capacitance layer effects

Peng, Hui; Shang, Baoqiang; Wang, Xing; Peng, Zhanhui; Chao, Xiaolian; Liang, Pengfei; Yang, Zupei

doi:10.1016/j.ceramint.2017.12.237

Cited by 42 publications

(39 citation statements)

References 35 publications

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“…Increasing DC bias induced the occurrence of additional step-like dielectric constant at low frequency range (< 10 2 Hz). Obviously, the additional dielectric constant plateau at low frequency is related to the electrode effect [31]. In Fig.…”

Section: Resultsmentioning

confidence: 89%

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Fan

Yang²,

Cao³

2020

Preprint

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Abstract The search for giant dielectric constant materials is imperative because of their potential for important applications for the areas of device miniaturization and energy storage. In this work, we report a (Zn + Ta) co-doped TiO2 (ZTTO) ceramics that manifests high dielectric permittivity (>104) and low dielectric loss. This dielectric property shows a high stability in wide temperature range (25-200℃) and frequency range(20-106Hz). The crystalline structure, microstructure and dielectric properties of ZTTO ceramics were systematically investigated. XPS, Impedance spectroscopy and frequency dependent dielectric constant under DC bias results reveal that the colossal dielectric properties of (Zn2+1/3Ta5+2/3)xTi1-xO2 ceramics were mainly caused by electron-pinned defect-dipoles (EPDD) model, internal barrier layer capacitance (IBLC) effect and electrode effect. This work would provide a guidance to further researching the colossal permittivity CP materials.

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Section: Resultsmentioning

confidence: 89%

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Fan

Yang²,

Cao³

2020

Preprint

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“…This finding has triggered a burst of research activities on (A + B) co‐doped TiO 2 ceramics. So far, the dual doping in TiO 2 can be clarified into two types: (i) tri‐ and pentavalent ions co‐doping, such as (In 3+ +Nb 5+ /Ta 5+ ), (Sm 3+ +Ta 5+ ), (V 3+ +Nb 5+ ), (Sc 3+ +Nb 5+ ), (Ga 3+ +Nb 5+ /Ta 5+ /Sb 5+ ), (Yb 3+ +Nb 5+ ), (Bi 3+ +Nb 5+ ), (Dy 3+ +Nb 5+ ), (Al 3+ +Nb 5+ /Ta 5+ /Sb 5+ ), (Er 3+ +Nb 5+ ), (Y 3+ +Nb 5+ ), (Tl 3+ +Nb 5+ ), (Eu 3+ +Nb 5+ ), (Pr 3+ +Nb 5+ ), and (La 3+ +Nb 5+ ), (ii) bi‐ and pentavalent ions co‐doping, such as (Ca 2+ +Nb 5+ ), (Mg 2+ +Nb 5+ /Ta 5+ ), and (Zn 2+ +Nb 5+ ) …”

Section: Introductionmentioning

confidence: 99%

“…After a wealth of follow‐up experimental investigations, the mechanism of the CP behavior in the co‐doped TiO 2 system is still a matter of debate. Aside from the original electron‐pinned defect‐dipole model, the internal barrier layer capacitor model, the surface barrier layer capacitor model, hopping conductivity, and polarization relaxation were also suggested to account for this behavior. This fact indicates that the CP behavior in the co‐doped TiO 2 system is far from well understood, and thus more experimental evidences are needed to fully characterize this behavior.…”

Section: Introductionmentioning

confidence: 99%

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO₂ ceramics

Wang

et al. 2019

J Am Ceram Soc

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(Na0.25Nb0.75)xTi1−xO2 (NNTO) ceramics (x = 0, 0.005, 0.01, 0.02, and 0.05) were prepared by the conventional solid‐state reaction. The microstructure, dielectric, and humidity sensitivity of the ceramics were systematically investigated. Results showed that all ceramics exhibit pure rutile TiO2 phase with dense microstructures. Co‐doping of (Na, Nb) can effectively improve the microstructure homogeneity of the ceramics. When the doping level x ≥ 0.01, the co‐doped samples show colossal permittivity higher than 104 and dielectric loss tangent lower than 0.38. This dielectric behavior features the merit of both frequency and temperature stability in the range of 102‐106 Hz and 100‐300 K, respectively. The co‐doped ceramics were found to be sensitive to the environment moisture. The humidity sensitivity incurs a Maxwell‐Wagner relaxation near room temperature, which further enhances the dielectric permittivity. Excellent humidity sensitive properties of sensitivity to be 102.6 pF/%RH, response/recovery time to be 115/20 seconds, as well as good repeatability, were achieved in the sample with the doping level x = 0.05. This work underscores that the room temperature dielectric properties of doubly doped TiO2 system depends strongly on the environmental condition and suggests that the (Na + Nb) co‐doped TiO2 ceramics might be promising humidity sensing materials.

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“…In the past decades, giant permittivity materials with a large dielectric constant ( ε r ), low dielectric loss (tanδ), and good thermal stability have attracted much attention due to the requirements for the miniaturization of electronic devices and high‐energy storage capacitors . In 2013, the remarkable dielectric behavior of the materials, In and Nb codoped TiO 2 ‐based ceramics, was reported by Liu et al; these materials showed low dielectric loss (<5%) and large dielectric constant (~10 4 ) and had better temperature stability in the range from 80 to 450 K. Meanwhile, the authors deemed that the origin of the dielectric response was attributed to the intrinsic dielectric effect, that is, the electron pinned defect dipole (EPDD).…”

Section: Introductionmentioning

confidence: 99%

“…In 2013, the remarkable dielectric behavior of the materials, In and Nb codoped TiO 2 ‐based ceramics, was reported by Liu et al; these materials showed low dielectric loss (<5%) and large dielectric constant (~10 4 ) and had better temperature stability in the range from 80 to 450 K. Meanwhile, the authors deemed that the origin of the dielectric response was attributed to the intrinsic dielectric effect, that is, the electron pinned defect dipole (EPDD). Subsequently, based on the same design idea, a series of codoped TiO 2 ‐based ceramics with better dielectric properties were also obtained for other ions (Ca 2+ , Zn 2+ , Mg 2+ , Sc 3+ , Y 3+ , Al 3+ , In 3+ , Yb 3+ , etc., as acceptors and Nb 5+ , Ta 5+ , etc., as donors) …”

Section: Introductionmentioning

confidence: 99%

Good thermal stability, giant permittivity, and low dielectric loss for X9R‐type (Ag_1/4Nb_3/4)_0.005Ti_0.995O₂ ceramics

et al. 2018

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With the intense demand of the developing microelectronics market, the study of giant permittivity dielectric materials is being promoted. However, it is difficult to obtain suitable dielectric materials for such applications, especially due to high dielectric loss at low frequencies. In this work, Ag+Nb codoped TiO2 ceramics were designed and fabricated in a conventional solid reaction by sintering at 1290‐1340°C for 5‐10 hours. The issue of how the microstructure and dielectric properties of (Ag1/4Nb3/4)0.005Ti0.995O2 ceramics are affected by the sintering conditions was discussed. By optimizing sintering conditions, a dense microstructure, a high dielectric constant (εr ≈ 9410), and a low dielectric loss (tanδ ≈ 0.037) at 1 kHz were achieved. Most importantly, the temperature coefficient value of εr at different frequencies remained stable between −14.3% and 13.7% within the temperature range from −190 to 200°C, which has potential applications in X9R capacitor.

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Origin of giant permittivity in Ta, Al co-doped TiO2: Surface layer and internal barrier capacitance layer effects

Cited by 42 publications

References 35 publications

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO₂ ceramics

Good thermal stability, giant permittivity, and low dielectric loss for X9R‐type (Ag_1/4Nb_3/4)_0.005Ti_0.995O₂ ceramics

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Origin of giant permittivity in Ta, Al co-doped TiO2: Surface layer and internal barrier capacitance layer effects

Cited by 42 publications

References 35 publications

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Colossal Permittivity and Multiple Effects in (Zn + Ta) co-doped TiO2 Ceramics

Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO2 ceramics

Good thermal stability, giant permittivity, and low dielectric loss for X9R‐type (Ag1/4Nb3/4)0.005Ti0.995O2 ceramics

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Product

Resources

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Microstructure, colossal permittivity, and humidity sensitivity of (Na, Nb) co‐doped rutile TiO₂ ceramics

Good thermal stability, giant permittivity, and low dielectric loss for X9R‐type (Ag_1/4Nb_3/4)_0.005Ti_0.995O₂ ceramics