Ultrahigh Permittivity, Ultralow Loss and Stability in (In0.5Ta0.5)0.1Ti0.9O2 Ceramics With Temperature Range From -100 to 235 °C

Abstract Dielectric materials with excellent dielectric properties are being promoted in requirements of microelectronic devices. In this study, (In0.5Ta0.5)0.1Ti0.9O2 ceramics were achieved by a solid-state reaction with reducing atmosphere of N2. Also, dense microstructure, ultrahigh permittivity (εr = 1.18 × 105) and ultralow dielectric loss (tanδ = 0.0072) were demonstrated at1 kHz. Interestingly enough, the temperature coefficient of permittivity which satisfies X9D (-100 °C - 235 °C, Δεr/ε25°C < ± 3.3 %) maintained stability at 1 kHz, and the dielectric mechanism could be connected to the electron-pinned defect dipoles (EPDD), which has favourable potential applications in electronic devices.

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Effects of Mg2SiO4 Addition on the Microstructure and Dielectric Properties of MgTiO3-CaTiO3 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.675.200 ◽

2013 ◽

Vol 675 ◽

pp. 200-204

Author(s):

Fei Shi ◽

Peng Cheng Du ◽

Jing Xiao Liu ◽

Ji Wei Wu ◽

De Qing Chen ◽

...

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Solid State ◽

Dielectric Loss ◽

Solid State Reaction ◽

Sintering Temperature ◽

Solid State Reaction Method ◽

Composite Ceramics ◽

Reaction Method ◽

Dielectric Ceramics

The Mg2SiO4-MgTiO3-CaTiO3 composite dielectric ceramics with different Mg2SiO4 addition amounts were prepared by solid state reaction method. The effects of Mg2SiO4 addition amounts on the microstructure and dielectric properties as well as sintering temperature of xMg2SiO4-(0.95-x)MgTiO3-0.05CaTiO3 (abbreviated as xMSTC, 0.25≦x≦0.75) composite ceramics were investigated. The results indicated that the sintering temperature of MgTiO3-CaTiO3 based ceramics with Mg2SiO4 addition could be lowered effectively to 1320~1340°C, and the dielectric constant decreased and dielectric loss increased gradually with the increase of Mg2SiO4 content. The 0.45MSTC ceramics containing 45 wt% Mg2SiO4 and sintered at 1340°C showed desirable dielectric properties with dielectric constant εr=13.3，dielectric loss tanδ=4.5×10-4 and temperature coefficient of relative permittivity τε =10 ppm/°C.

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Study on the Property of Bi2(Mg2/3Nb1.1833Sn0.15)O7 Dielectric Ceramics Doped with Li2CO3

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.549.749 ◽

2012 ◽

Vol 549 ◽

pp. 749-752

Author(s):

Hai Tang Hua ◽

Xin You Huang ◽

Zhi Wen Zhu ◽

Yin Qun Hua ◽

Yan Li

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Solid State ◽

Dielectric Loss ◽

Solid State Reaction ◽

Piezoelectric Ceramics ◽

Solid State Reaction Method ◽

Conventional Solid State Reaction ◽

Reaction Method ◽

Dielectric Ceramics

(Bi2-xLix) (Mg2/3Nb1.1833Sn0.15)O7 piezoelectric ceramics were prepared by conventional solid state reaction method. The microstructure and dielectric properties of dielectric ceramics were studied which was doped by different amount of Li2CO3. The experiment results showed that the density of the ceramics would decrease, but have little effect on the microstructure of the ceramics when the amount of the Li2CO3 doped increases. With the increasing of Li2CO3 doped, the dielectric constant(εr) and dielectric loss(tanδ) of dielectric ceramics first decreases and then increases. When tested in 1MHz frequency, the piezoelectric ceramics display the optimum properties tanδ is 0.00009, εr is 163 while Li2CO3 doped amount is 0.05 mol%.

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Effects of Forming Gas Annealing on Ba4Nb2O9 Ceramics

Materials Science Forum ◽

10.4028/www.scientific.net/msf.687.275 ◽

2011 ◽

Vol 687 ◽

pp. 275-278

Author(s):

Yuan Meng ◽

Wan Ping Chen

Keyword(s):

Solid State ◽

Dielectric Loss ◽

Solid State Reaction ◽

Oxygen Vacancies ◽

Low Frequency ◽

Partial Recovery ◽

Oxidation Treatment ◽

Reducing Atmosphere ◽

Heat Treated ◽

Oxidation In Air

Ba4Nb2O9 ceramics were synthesized via solid state reaction and sintered in air. Annealing in 5%H2 + 95%N2 at 900°C for 2 h resulted in an increase in leakage current by several orders of magnitude, and obvious increases in low-frequency capacitance and dielectric loss, while re-oxidation in air at 900°C for 2 h led to a partial recovery. It is proposed that oxygen vacancies and Nb4+ were formed through annealing in the reducing atmosphere while inverse process occurred in the re-oxidation treatment. Re-oxidation is helpful to improve the properties of barium niobates ceramics sintered or heat-treated in reducing atmospheres and further investigations are desirable.

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Dielectric Properties of Mg-Doped CaCu3Ti4O12 Measured at High Frequencies

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.895.190 ◽

2014 ◽

Vol 895 ◽

pp. 190-193

Author(s):

Mohd Fariz Ab Rahman ◽

Sabar Derita Hutagalung ◽

Julie Juliewatty Mohamed ◽

Mohd Fadzil Ain

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Solid State ◽

Dielectric Loss ◽

Solid State Reaction ◽

Single Phase ◽

Raw Materials ◽

Sintering Process ◽

High Frequencies ◽

Mg Doped

Mg-doped CaCu3Ti4O12 (CCTO) systems were prepared by solid state reaction using raw materials of CaCO3, CuO, TiO2 and MgO. The samples were calcined at 900°C for 12 hours and sintered at 1030°C for 10 hours. Single phase CCTO formed after sintering process. It was found that dielectric constant and dielectric loss of CCTO improved by MgO dopant.

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Effects of the Replacement of Ti by Zr on the Dielectric Properties of CaCu3Ti4012 Ceramics

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.368-372.118 ◽

2008 ◽

Vol 368-372 ◽

pp. 118-120 ◽

Cited By ~ 3

Author(s):

Jing Han You ◽

Qing Dong Chen ◽

Wei Wei Ju ◽

Li Ben Li ◽

Kai Chen

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Solid State ◽

Dielectric Loss ◽

Solid State Reaction ◽

Solid State Reaction Method ◽

Partial Replacement ◽

Reaction Method ◽

Two Samples ◽

Comparison Of The Results

CaCu3Ti4O12 and CaCu3Ti3.9Zr0.1O12 ceramics were prepared by the traditional solid-state reaction method and the dielectric properties were investigated. Comparison of the results of the two samples examined indicated that the partial replacement of titanium by zirconium in the system CaCu3Ti4O12 may result in different changes of the dielectric constant and dielectric loss. For these experimental phenomena possible explanations and predictions also have been presented.

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Influence of Lanthanum on Microstructure and Dielectric Properties of Barium Titanate Ceramics by Solid State Reaction

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.412.275 ◽

2011 ◽

Vol 412 ◽

pp. 275-279 ◽

Cited By ~ 6

Author(s):

Wei Cai ◽

Chun Lin Fu ◽

Ze Bin Lin ◽

Xiao Ling Deng ◽

Wei Hai Jiang

Keyword(s):

Dielectric Properties ◽

Solid State ◽

Dielectric Loss ◽

Barium Titanate ◽

Lattice Constant ◽

Solid State Reaction ◽

Lanthanum Content ◽

Doped Barium Titanate ◽

Titanate Ceramics ◽

La Doped

La-doped barium titanate ceramics with 0~1.0 at.% La2O3 were prepared by conventional solid state reaction method. The crystal structure and dielectric properties of La-doped barium titanate ceramics were investigated. Lanthanum ions have entered the unit cell and substituted for Ba2+ ions on the A sites of perovskite structure. The a-axis lattice constant increases and the c-axis lattice constant decreases as lanthanum content increases. Addition of lanthanum leads to the fall of the Curie temperature of La-doped BTO ceramics. There are two different doping mechanisms for La-doped BTO ceramics. The dielectric loss of BTO ceramics with 0.3 at.% La2O3 is higher than that of pure BTO ceramics. When lanthanum content is above 0.5 at.%, the dielectric loss of La-doped BTO ceramics decrease with the increasing of lanthanum content. The result of dielectric constant as a function of temperature at different frequencies indicates that La-doped BTO ceramics are not relaxor ferroelectrics but ferroelectrics with diffuse phase transition.

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Effect of Nd3+ substitution for Bi3+ on the dielectric properties and conduction behavior of Aurivillius NdBi4Ti3FeO15 ceramics

RSC Advances ◽

10.1039/c5ra27821j ◽

2016 ◽

Vol 6 (25) ◽

pp. 21254-21260 ◽

Cited By ~ 10

Author(s):

Fida Rehman ◽

Hai-Bo Jin ◽

Lin Wang ◽

Abbas Tanver ◽

De-Zhi Su ◽

...

Keyword(s):

Dielectric Properties ◽

Solid State ◽

Solid State Reaction ◽

Conduction Behavior

NdBi4Ti3FeO15 and Bi5Ti3FeO15 ceramics were prepared by solid state reaction.

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The Morphologies and Photoluminescence of Ce3+-Doped 0.5La2O3-2SrO-0.5Al2O3 Phosphors with SrF2

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.680.228 ◽

2016 ◽

Vol 680 ◽

pp. 228-232

Author(s):

Xi Guang Gu ◽

Ren Li Fu ◽

Ye Tang ◽

Fang Yang

Keyword(s):

Solid State ◽

White Light ◽

Solid State Reaction ◽

Emission Intensity ◽

Solid State Reaction Method ◽

Conventional Solid State Reaction ◽

Light Emitting ◽

Reaction Method ◽

Reducing Atmosphere ◽

White Light Emitting Diodes

Ce3+-doped 0.5La2O3-2SrO-0.5Al2O3 (LSA:Ce) phosphors had been successfully synthesized using a conventional solid-state reaction method under reducing atmosphere (H2/N2 =1/5). The phase, morphologies and luminescence properties of the LSA:Ce phosphors were investigated. The emission intensity of LSA:Ce phosphors was improved by the addition of SrF2 as flux, and red shift of PL spectra peak was observed in this phosphors. Research results shown that the LSA:Ce phosphors have the potential to meet the development of white light-emitting diodes.

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