Results 161 to 170 of about 62,857 (189)

Capacitance scaling of grain boundaries with colossal permittivity of CaCu3Ti4O12-based materials

Solid State Sciences, 2015
Abstract Samples of copper-deficient CaCu3Ti4O12 (CCTO) compared to the nominal composition, all synthesized via organic gel-assisted citrate process, show huge change of grain boundaries capacitance as deduced from a fit of an RC element model to the impedance spectroscopic data. The grain boundary capacitance is found to scale with the permittivity
de Almeida-Didry, Sonia, Autret, Cecile, Honstettre, Christophe, Lucas, Anthony, Pacreau, François, Gervais, François   +5 more
openaire   +2 more sources

Colossal permittivity in (Li + Nb) co-doped Fe2O3 ceramics

Current Applied Physics, 2020
Abstract (Li + Nb) co-doped (Li + Nb)xFe2-xO3 (with x = 0.0005, 0.005, 0.05, and 0.1) ceramics were prepared by sol-gel method. Their structural, dielectric, humidity, and magnetic properties were investigated. Colossal permittivity (~104) was approached or achieved in all doped samples even with a very small doping level of x = 0.0005.
Y.M. Fei, Q.Q. Wang, J. Sun, S.T. Wang, T.Y. Li, J. Wang, C.C. Wang   +6 more
openaire   +1 more source

Dielectric properties of (Bi0.5Nb0.5) Ti1-O2 ceramics with colossal permittivity

Journal of Alloys and Compounds, 2017
Abstract The (Bi 0.5 Nb 0.5 ) x Ti 1- x O 2 (BNTO, 0 ≤  x  ≤ 0.05) ceramics were synthesized by a standard conventional solid-state reaction. The effects of sintering temperature and composition x on the crystal structure, microstructure, and dielectric properties of BNTO ceramics were investigated. A pure rutile phase is achieved as x  ≤ 0.01,
Yuechan Song, Peng Liu, Xiaogang Zhao, Baochun Guo, Xiulei Cui   +4 more
openaire   +1 more source

Colossal dielectric permittivity and relevant mechanism of Bi2/3Cu3Ti4O12 ceramics

Ceramics International, 2016
Abstract Bi 2/3 Cu 3 Ti 4 O 12 (BCTO) ceramics with pure perovskite phase were successfully prepared by traditional solid-state reaction technique. Uniformly distributed and dense grains with the grain size of 2–3 μm were observed by SEM. A giant low-frequency dielectric permittivity of ~3.3×10 5 was obtained.
Longhai Yang, Gemeng Huang, Tingting Wang, Hangfei Hao, Ye Tian   +4 more
openaire   +1 more source

Wireless power transfer system based on colossal permittivity resonators

2017 11th International Congress on Engineered Materials Platforms for Novel Wave Phenomena (Metamaterials), 2017
We proposed novel dielectric resonators with colossal permittivity e=1000 for wireless power transfer. Numerical simulation and experimental investigation of the WPT system efficiency are performed. The highest power transfer efficiency of 90% at 232 MHz is verified experimentally.
M. Song, P. Kapitanova
openaire   +1 more source

Colossal dielectric permittivity in CuCrO2 ceramics

Chinese Journal of Physics, 2022
Chao Cheng, Yuanmiao Xie, Pengfei Chen, Yi Yu, Shouguo Huang, Yide Li, Chunchang Wang   +6 more
openaire   +1 more source

Wireless power transfer based on dielectric resonators with colossal permittivity

Applied Physics Letters, 2016
Magnetic resonant wireless power transfer system based on dielectric disk resonators made of colossal permittivity (ε = 1000) and low loss (tan δ = 2.5 × 10–4) microwave ceramic is experimentally investigated. The system operates at the magnetic dipole mode excited in the resonators providing maximal power transfer efficiency of 90% at the frequency ...
Mingzhao Song, Pavel Belov, Polina Kapitanova   +2 more
openaire   +1 more source

Colossal permittivity and dielectric relaxations in (La0.5Nb0.5) Ti1-O2 ceramics

Journal of Alloys and Compounds, 2018
Abstract A series of La+Nb co-doped TiO2 (La0.5Nb0.5)xTi1-xO2 (0.25% ≤ x ≤ 5%) ceramics were prepared using a solid-state reaction method. Colossal permittivity (CP) (eʹ > 104) and low dielectric loss (tanδ  104 and tanδ 25 K at 1 kHz) was primarily related to EPDD polarization.
Baochun Guo, Peng Liu, Xiulei Cui, Yuechan Song   +3 more
openaire   +1 more source

Colossal Permittivity and Ferroelectricity in TiO2-Based Ceramics Induced by Defect Clusters

ACS Applied Materials & Interfaces
Abstract The substitution of donor–acceptor ion pairs in metal oxides creates local chemically unstable states, thereby altering properties and even generating functions unattainable in the host materials. Herein, ferroelectricity and colossal permittivity responses are co-evoked in rutile TiO2 ceramics via the donor–acceptor (Nb5 ...
Zhiyong Liu, Dan Zhong, Qifang Ruan, Kun Guo, Pu Mao, Bing Xie, Zhiguo Wang, Longlong Shu   +7 more
openaire   +2 more sources

Colossal permittivity and dielectric relaxations in BaTi0.99(Nb0.5Ga0.5)0.02O3 ceramics

Ceramics International, 2015
Dielectric properties of pure phase BaTi0.99(Nb0.5Ga0.5)(0.02)O-3 ceramics, prepared via a conventional solid-state method, have been studied in the frequency range 0.01 Hz-10 MHz, at temperatures 130 degrees C to 200 degrees C. Colossal dielectric constant, epsilon(r)similar to 2 x 10(5), and low dielectric loss, tan delta similar to 0.05 at 1 kHz ...
Ying Wu, Jiyuan Miao, Zhifu Liu, Yongxiang Li   +3 more
openaire   +1 more source