Dielectric Relaxation in Zr-Doped SrTiO3 Ceramics Sintered in N2 with Giant Permittivity and Low Dielectric Loss

2014 ◽  
Vol 98 (2) ◽  
pp. 476-482 ◽  
Author(s):  
Zhijian Wang ◽  
Minghe Cao ◽  
Qi Zhang ◽  
Hua Hao ◽  
Zhonghua Yao ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
Low Dielectric ◽  
Srtio3 Ceramics

Phase Formation and Dielectric Properties of Ln3NbO7 (Ln = Rare Earth Elements)

2006 ◽  
Vol 988 ◽  
Author(s):  
Lu Cai ◽  
Julián Guzmán ◽  
Louis A. Pérez ◽  
Juan C. Nino
Keyword(s):  
Rare Earth ◽  
Dielectric Properties ◽  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
Relative Permittivity ◽  
Temperature Dependent ◽  
Low Dielectric ◽  
Pyrochlore Type ◽  
Dielectric Relaxation Behavior ◽  
Increasing Temperature

AbstractThe structure and dielectric properties of rare earth niobate compounds within the Ln3NbO7 (Ln = Nd, Gd, Dy, Er, Yb and Y) and Ln2(Ln',Nb)O7 (Ln = Nd, Sm and Ln' = Yb) series are investigated. The crystal structure of the all the studied materials is found to be fluorite-related including webertite-type, pyrochlore, and defect fluorite structures. It is observed that the relative permittivity of the defect fluorite Ln3NbO7 (Ln = Dy, Er, Yb and Y) increases with the increase in temperature and exhibits low dielectric loss up to approximately 350 K. Above 350 K, the dielectric loss increases rapidly with increasing temperature as the onset of electrical conductivity takes place. Of particular interests are Gd3NbO7 and Nd3NbO7, which exhibit a frequency and temperature dependent dielectric relaxation behavior. At 1 MHz Gd3NbO7 reaches its maximum relative permittivity of ∼34 at about 330K, while at the same frequency, the maximum relative permittivity of Nd3NbO7 is attained at about 500 K. By contrast, Nd2(Yb,Nb)O7 and Sm2(Yb,Nb)O7, which crystallize in a pyrochlore-type structure, do not show dielectric relaxation and, comparatively, exhibit a more temperature-stable dielectric permittivity response.

Giant permittivity and low dielectric loss of SrTiO3 ceramics sintered in nitrogen atmosphere

2014 ◽  
Vol 34 (7) ◽  
pp. 1755-1760 ◽  
Author(s):  
Zhijian Wang ◽  
Minghe Cao ◽  
Zhonghua Yao ◽  
Qi Zhang ◽  
Zhe Song ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Nitrogen Atmosphere ◽  
Low Dielectric ◽  
Srtio3 Ceramics

Anomalous Dielectric Nonlinearity in Niobium and Aluminum Co-doped SrTiO3 Ceramics with Giant Permittivity and Low Dielectric Loss

2019 ◽  
Vol 123 (30) ◽  
pp. 18142-18149 ◽  
Author(s):  
Zichen He ◽  
Minghe Cao ◽  
Yong Tao ◽  
Yangyang Suo ◽  
Hua Hao ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Low Dielectric ◽  
Dielectric Nonlinearity ◽  
Srtio3 Ceramics ◽  
Co Doped

Skin–core structured fluorinated MWCNTs: a nanofiller towards a broadband dielectric material with a high dielectric constant and low dielectric loss

2018 ◽  
Vol 6 (9) ◽  
pp. 2370-2378 ◽  
Author(s):  
Yang Liu ◽  
Cheng Zhang ◽  
Benyuan Huang ◽  
Xu Wang ◽  
Yulong Li ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
High Dielectric Constant ◽  
Dielectric Material ◽  
Epoxy Composite ◽  
Low Dielectric ◽  
High Dielectric

A novel skin–core structured fluorinated MWCNT nanofiller was prepared to fabricate epoxy composite with broadband high dielectric constant and low dielectric loss.

High Frequency Dielectric Response of the Ionic Liquid N-Methyl-N-ethylpyrrolidinium Dicyanamide

2007 ◽  
Vol 60 (1) ◽  
pp. 6 ◽  
Author(s):  
Simon Schrödle ◽  
Gary Annat ◽  
Douglas R. MacFarlane ◽  
Maria Forsyth ◽  
Richard Buchner ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Dielectric Loss ◽  
Dielectric Relaxation ◽  
High Frequency ◽  
Dielectric Response ◽  
Room Temperature ◽  
Room Temperature Ionic Liquid ◽  
Dielectric Relaxation Spectroscopy ◽  
Frequency Range ◽  
Fast Rotation

A study of the room-temperature ionic liquid N-methyl-N-ethylpyrrolidinium dicyanamide by dielectric relaxation spectroscopy over the frequency range 0.2 GHz ≤ ν ≤ 89 GHz has revealed that, in addition to the already known lower frequency processes, there is a broad featureless dielectric loss at higher frequencies. The latter is probably due to the translational (oscillatory) motions of the dipolar ions of the IL relative to each other, with additional contributions from their fast rotation.

Magnetodielectric Ni ferrite ceramics with Bi2O3 additive for potential antenna miniaturizations

2009 ◽  
Vol 24 (2) ◽  
pp. 324-332 ◽  
Author(s):  
X.T. Liew ◽  
K.C. Chan ◽  
L.B. Kong
Keyword(s):  
Magnetic Properties ◽  
Dielectric Loss ◽  
Grain Growth ◽  
Sintering Temperature ◽  
Magnetic Loss ◽  
Liquid Phase Sintering ◽  
X Ray Diffraction ◽  
Low Dielectric ◽  
High Concentrations

This paper reports on the preparation and characterization of nickel ferrite (NiFe1.98O4) ceramics doped with Bi2O3 as sintering aid. Focus has been on the effects of concentration of Bi2O3 and sintering temperature on the densification, grain growth, dielectric, and magnetic properties of the NiFe1.98O4 ceramics, with an aim at developing magnetodielectric properties, with almost equal real permeability and permittivity, as well as sufficiently low magnetic and dielectric loss tangents, over 3 to 30 MHz (high frequency or HF band). X-ray diffraction results indicated that there is no obvious reaction between NiFe1.98O4 and Bi2O3, at Bi2O3 levels of up to 7 wt% and temperatures up to 1150 °C. The addition of Bi2O3 facilitated a liquid phase sintering mechanism for the densification of NiFe1.98O4 ceramics. The addition of Bi2O3 not only improved the densification but also promoted the grain growth of NiFe1.98O4 ceramics. To achieve sufficiently low dielectric loss tangent, the concentration of Bi2O3 should not be less than 5 wt%. The low dielectric loss tangents of the samples doped with high concentrations of Bi2O3 can be attributed to the full densification of the ceramics. Magnetic properties of the NiFe1.98O4 ceramics, as a function of sintering temperature and Bi2O3 concentration, can be qualitatively explained by the Globus model. Promising magnetodielectric properties have been obtained in the sample doped with 5% Bi2O3 and sintered at 1050 °C for 2 h. The sample has almost equal values of permeability and permittivity of ∼12, together with low dielectric and magnetic loss tangents, over 3 to 30 MHz. This material might be useful for the miniaturization of HF (3 to 30 MHz) antennas.

scholarly journals Crown ether-containing polyimides with high dielectric constant

RSC Advances ◽  
2017 ◽  
Vol 7 (38) ◽  
pp. 23309-23312 ◽  
Author(s):  
Ting Yang ◽  
Wenhui Xu ◽  
Xinwen Peng ◽  
Haoqing Hou
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Crown Ether ◽  
High Dielectric Constant ◽  
Low Dielectric ◽  
High Dielectric

Crown ether-containing polyimides possess high dielectric constant and low dielectric loss, without sacrificing other properties.

PREPARATION AND CHARACTERIZATION OF MECHANICALLY FLEXIBLE RUBBER-CERAMIC COMPOSITE DIELECTRICS

2013 ◽  
Vol 22 ◽  
pp. 148-152
Author(s):  
DHANESH THOMAS ◽  
M. T. SEBASTIAN
Keyword(s):  
Dielectric Loss ◽  
Hot Pressing ◽  
Relative Permittivity ◽  
Ceramic Composite ◽  
Temperature Stability ◽  
Theoretical Models ◽  
Butyl Rubber ◽  
Low Dielectric

Butyl rubber — Ca 4 La 6( SiO 4)4( PO 4)2 O 2 — composites have been prepared by sigma mixing and hot pressing. The relative permittivity of the composites varies from 3 to 5.3 at 1 MHz. All the composites show low dielectric loss of the order of 10−3 at 1 MHz. The experimentally observed values of relative permittivity are correlated with those calculated using various theoretical models. The composites show good temperature stability of relative permittivity.

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