Studies on Structural, Microwave Dielectric Properties, and Low-Temperature Sintering of 1.52Li2O-0.36Nb2O5-1.34TiO2 Ceramic

The structure, microwave dielectric properties and low-temperature sintering of a new Li2O-Nb2O5-TiO2 system ceramic with the Li2O: Nb2O5: TiO2 mole ratio of 1.52: 0.36: 1.34 have been investigated in this study. The 1.52Li2O-0.36Nb2O5-1.34TiO2 (LNT) ceramic is composed of two phases, the “M-Phase” and Li2TiO3 solid solution (Li2TiO3ss) phase. This new microwave dielectric ceramic has low intrinsic sintering temperature ( ~ 1100 oC ) and good microwave dielectric properties of middle permittivity (εr ~38.6), high Q×f value up to 7712 GHz, and near zero τf value (~ 4.64 ppm/oC). In addition, the sintering temperature of the LNT ceramics could be lowered down effectively from 1100 oC to 900 oC by adding 1 wt.% B2O3. Good microwave dielectric properties of εr = 42.5, Q*f =6819 GHz and τf = 2.7 ppm/oC could be obtained at 900 oC, which indicate the ceramics would be promising candidates for low-temperature co-fired ceramics (LTCC) applications.

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A new low-loss microwave dielectric ceramic for low temperature cofired ceramic applications

Journal of Materials Research ◽

10.1557/jmr.2010.0160 ◽

2010 ◽

Vol 25 (7) ◽

pp. 1235-1238 ◽

Cited By ~ 34

Author(s):

Huanfu Zhou ◽

Xiuli Chen ◽

Liang Fang ◽

Dongjin Chu ◽

Hong Wang

Keyword(s):

Dielectric Properties ◽

Low Temperature ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

Microwave Dielectric Ceramic ◽

X Ray Diffraction ◽

Low Loss ◽

Dielectric Ceramic ◽

X Ray ◽

Microwave Dielectric

A new low sintering temperature microwave dielectric ceramic, Li2ZnTi3O8, was investigated. X-ray diffraction data show that Li2ZnTi3O8 has a cubic structure [P4332(212)] with lattice parameters a = 8.37506 Å, V = 587.44 Å3, and Z = 4 when the sintering temperature is 1050 °C. The Li2ZnTi3O8 ceramic exhibits good microwave dielectric properties with εr about 26.2, Q×f value about 62,000 GHz, and τf about −15 ppm/°C. The addition of BaCu(B2O5) can effectively lower the sintering temperature from 1050 to 900 °C without degrading the microwave dielectric properties. Compatibility with Ag electrode indicates this material can be applied to low temperature cofired ceramic devices.

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Low Temperature Sintering of (Ca0.9375Sr0.0625)0.25(Li0.5Sm0.5)0.75TiO3 Microwave Dielectric Ceramics

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.1028 ◽

2010 ◽

Vol 663-665 ◽

pp. 1028-1031

Author(s):

Yue Ming Li ◽

Hua Zhang ◽

Zhu Mei Wang ◽

Yan Hong ◽

Zong Yang Shen

Keyword(s):

Dielectric Properties ◽

Low Temperature ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

Sintering Behavior ◽

Low Temperature Sintering ◽

Microwave Dielectric Ceramics ◽

Microwave Dielectric ◽

Dielectric Ceramics

The sintering behavior and microwave dielectric properties of the (Ca0.9375Sr0.0625)0.25(Li0.5Sm0.5)0.75TiO3 (CSLST) ceramics doped with different amounts of Li2O-B2O3-SiO2-CaO-Al2O3 (LBSCA) glass were investigated. The sintering temperature of the CSLST ceramics can be effectively reduced over 200oC due to the addition of LBSCA glass. For the 5 wt% LBSCA-doped CSLST ceramics, which are sintered at only 1000 oC for 5 h, show optimum microwave dielectric properties as follows: εr=84.74, Qf=2446 GHz and τf=-12.48 ppm/oC.

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Low-Temperature Sintering and Microwave Dielectric Properties of the Zn2SiO4 Ceramics

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.66.104 ◽

2009 ◽

Vol 66 ◽

pp. 104-107 ◽

Cited By ~ 3

Author(s):

Ying Dai ◽

Yao Sun ◽

Wen Chen

Keyword(s):

Dielectric Properties ◽

Solid State ◽

Low Temperature ◽

Sintering Temperature ◽

Sol Gel ◽

Microwave Dielectric Properties ◽

Low Temperature Sintering ◽

Sintering Aid ◽

Microwave Dielectric ◽

Low Sintering Temperature

Willemite ceramics (Zn2SiO4) possess excellent millimeter-wave dielectric properties, but it also has a high sintering temperature above 1300°C by traditional solid-state reaction and relatively large negative τf value. Zn2SiO4 nanoparticles synthesized by Sol–Gel method were used to improve the sintering and dielectric properties of the Zn2SiO4 ceramics. Using the nanoparticles, Zn2SiO4 ceramics can be sintered at a low temperature, 1150°C and exhibited improved microwave dielectric properties of εr =6.62, Q × f=24500 GHz, τf =-59ppm/°C. By adding TiO2 with high positive τf value (+450 ppm/°C) and CuO as sintering aid, near zero τf value and low sintering temperature can be achieved. With 11wt% of TiO2 and 5 wt% of CuO, an εr value of 9.3, a Q × f value of 12200GHz and a τf value of -11 ppm/°C were obtained at 1000°C, confirming the promising potential of the CuO-added TiO2-Zn2SiO4 ceramics as candidate materials for low–temperature cofired ceramic (LTCC) devices.

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Low Temperature Sintering and Microwave Dielectric Properties of Ba4Nd9.33Ti18O54 Ceramics Doped with Crystallizable Glass

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.412.280 ◽

2011 ◽

Vol 412 ◽

pp. 280-284

Author(s):

Ru Zhong Zuo ◽

Yang Lv ◽

Yang Wu ◽

Zhen Xing Yue

Keyword(s):

Dielectric Properties ◽

Low Temperature ◽

Grain Growth ◽

Sintering Temperature ◽

Sol Gel ◽

Microwave Dielectric Properties ◽

Air Bubbles ◽

Low Temperature Sintering ◽

Porous Structures ◽

Microwave Dielectric

The effect of CaO-B2O3-SiO2 glass on the densification, microstructure and microwave dielectric properties of Ba4Nd9.33Ti18O54 ceramics was investigated in this work. It was found that the addition of a few amount of glass (≤2%) could effectively decrease the sintering temperature owing to the viscous sintering. However, locally porous structures were formed when overmuch glass was added because of enwrapped air bubbles and rapid grain growth. In addition, the amount of remaining glass after sintering could be decreased due to the re-crystallization of CaO-B2O3-SiO2 glass. Sol-gel derived Ba4Nd9.33Ti18O54 ceramics containing 2 wt% glass can be well densified at 950°C and exhibit good microwave dielectric properties of εr=68 and Q×f=7400 GHz.

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Low Temperature Sintering of Ca0.6La0.8/3TiO3-Li0.5Nd0.5TiO3 Ceramics with ZnO-B2O3-SiO2 Glass Addition

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.335-336.956 ◽

2011 ◽

Vol 335-336 ◽

pp. 956-959 ◽

Cited By ~ 1

Author(s):

Yong Jun Gu ◽

Jin Liang Huang ◽

Wei Hu ◽

Qian Li ◽

Li Hua Li ◽

...

Keyword(s):

Dielectric Properties ◽

Low Temperature ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

Low Temperature Sintering ◽

Suitable Candidate ◽

Glass Addition ◽

Microwave Dielectric

The sintering behaviors and microwave dielectric properties of the Ca0.6La0.8/3TiO3-Li0.5Nd0.5TiO3 (abbreviated CLLNT) ceramics doped by small amounts of ZnO-B2O3-SiO2 glass were investigated in this paper. The adding of ZnO-B2O3-SiO2 glass improved the densifications of the CLLNT ceramics and the sintering temperature of the CLLNT ceramic had been efficiently lowered to 1050°C. Especially, the 8wt% ZnO-B2O3-SiO2 glass doped CLLNT ceramic sintered at 1050°C for 3 h has optimum microwave dielectric properties of Kr=89, Q×f=1445GHz, and TCF=11.4 ppm/°C and it should be a suitable candidate for LTCC applications.

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Low-Temperature Sintering and Microwave Dielectric Properties of (Ca0.9Mg0.1)SiO3 Ceramic with Li2CO3 Addition

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.602-603.748 ◽

2014 ◽

Vol 602-603 ◽

pp. 748-751 ◽

Cited By ~ 1

Author(s):

Xin Hui Zhao ◽

Min Jia Wang ◽

Qi Long Zhang ◽

Hui Yang

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Low Temperature ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

Low Dielectric Constant ◽

Low Temperature Sintering ◽

Low Dielectric ◽

Densification Temperature ◽

Microwave Dielectric

(Ca0.9Mg0.1)SiO3ceramics possess a low dielectric constant and a highQfvalue, however, the densification temperature of (Ca0.9Mg0.1)SiO3ceramics is higher than 1280°C. In this paper, the effect of Li2CO3addition on sinterability and dielectric properties of (Ca0.9Mg0.1)SiO3ceramics were studied. The phase presence and surface morphology were determined by XRD and SEM techniques, respectively. CaSiO3and Ca2MgSi2O7phases were observed. With the addition of >2.0 wt% Li2CO3, the sintering temperature of (Ca0.9Mg0.1)SiO3ceramic was significantly lowered, reaching to 1070°C. (Ca0.9Mg0.1)SiO3ceramics with 4wt% Li2CO3sintered at 1070°C for 3 h shows excellent dielectric properties:εr=5.91,Qf= 15300GHz (at 10GHz).

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Low Temperature Co-Fired ZnNb2O6 Dielectric Ceramic Doped by B2O3

Materials Science Forum ◽

10.4028/www.scientific.net/msf.849.209 ◽

2016 ◽

Vol 849 ◽

pp. 209-215 ◽

Cited By ~ 3

Author(s):

Jian Yang ◽

Ji Kang Yan ◽

Jing Hong Du ◽

Fang Chun Yan ◽

Kun Yong Kang ◽

...

Keyword(s):

Dielectric Properties ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

Solid State Reaction Method ◽

Ionic Diffusion ◽

Microwave Dielectric Ceramic ◽

Dielectric Ceramic ◽

Microwave Dielectric ◽

Microstructure Density ◽

Activation Energy Of Diffusion

To lower the sintering temperature of ZnNb2O6 microwave dielectric ceramic, ZnNb2O6 doped with B2O3 were prepared by the traditional solid state reaction method. The effects of the amount of B2O3 (0.25-5.0wt.%) on the microstructure, density and electrical performances were investigated. The results show that a pure columbite ZnNb2O6 phase was obtained for all B2O3-doped ceramics. The microwave dielectric properties reached the maximum values of εr = 24.1, Q×f = 19502 GHz, τf = -52.19 ppm/°C for 1wt% B2O3-doped ZnNb2O6 ceramic sintered at 1050 °C for 4 h. All of evidences suggest that the enhancement of microwave dielectric properties is due to the enhanced ions-energy and ionic diffusion with the increase of sintering temperature. Furthermore, B2O3 doping can generate liquid phase and reduce the activation energy of diffusion to promote the materials sintering.

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