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

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.

Study on Low-Temperature Sintering of Microwave Dielectric Ceramics by Sol-Coating Method

2009 ◽  
Vol 66 ◽  
pp. 214-217
Author(s):  
Jian Mei Xu ◽  
Zhen Min Jin ◽  
Hui Juan Gao
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Copper Electrode ◽  
Low Temperature Sintering ◽  
Microwave Dielectric Ceramics ◽  
Microwave Dielectric ◽  
Coating Method ◽  
Low Sintering Temperature ◽  
Dielectric Ceramics

Microwave dielectric ceramics with low sintering temperature were obtained by sol-coating method. The effect of glass additives on the sintering temperature and microwave dielectric properties of BaO–Nd2O3–TiO2 ceramics were investigated. The ceramics added with NBS glass have much higher quality factor Qf= 4658.9 GHz. The ceramics added with BBS glass have the highest dielectric constantεr=71.4 and lest temperature coefficient of resonant frequency τf =29.15×10-6/ °C. The ceramics added BBS glass are as follows:εr=58.58, Qf= 2986GHz, τf =29.15×10-6/ °C sintered at 1060°C where the ceramics can be co-fired with copper electrode.

Structure and Microwave Dielectric Properties of (Ca0.9375Sr0.0625)0.25 (Li0.5Sm0.5)0.75TiO3 Ceramics with B2O3-CuO Sintering Aids

2011 ◽  
Vol 284-286 ◽  
pp. 1442-1446
Author(s):  
Yue Ming Li ◽  
Zong Yang Shen ◽  
Zhu Mei Wang ◽  
Hua Zhang ◽  
Yan Hong ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric Ceramics ◽  
Sintering Aids ◽  
Oxide Mixture ◽  
High Permittivity ◽  
Microwave Dielectric ◽  
Dielectric Ceramics

The B2O3-CuO oxide mixture (abbreviated as BC) was selected to lower the sintering temperature of (Ca0.9375Sr0.0625)0.25(Li0.5Sm0.5)0.75TiO3 (abbreviated as CSLST) microwave dielectric ceramics by solid sate reaction technique. The effects of BC doping amounts on the crystal structure, microstructure and microwave dielectric properties of the ceramics were investigated. For the ceramic sample with the composition of CSLST + 5 wt% BC, its sintering temperature was reduced to 1000 °C as compared to 1200 °C for pure CSLST. In addition to the obtained good microwave dielectric properties as follows: εr = 80.4, Q×f = 1380 GHz, τf = -32.89 ×10-6/°C, this ceramic was a desirable high-permittivity microwave dielectric candidate for low-temperature cofired ceramic (LTCC) applications.

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

2012 ◽  
Vol 512-515 ◽  
pp. 1226-1230
Author(s):  
Qun Zeng ◽  
Yong Heng Zhou
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric Ceramic ◽  
Low Temperature Sintering ◽  
Dielectric Ceramic ◽  
Microwave Dielectric ◽  
M Phase ◽  
Two Phases

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.

Application of La2O3-B2O3-TiO2 Glass-Ceramic for Low Temperature Co-Fired Ceramic (LTCC) Materials

2004 ◽  
Vol 449-452 ◽  
pp. 729-732 ◽  
Author(s):  
Byung Hae Jung ◽  
Seong Jin Hwang ◽  
Hyung Sun Kim
Keyword(s):  
Rare Earth ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Borate Glass ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
Microwave Dielectric ◽  
Good Potential ◽  
Phase Evaluation

A low-temperature co-fired composition with sintering temperature of <900 °C was developed using rare earth derived borate glass (La2O3-B2O3-TiO2) and a conventional BNT (BaONd2O3-TiO2) ceramic. The sintering behavior, phase evaluation, sintered morphology, and microwave dielectric properties were investigated. It was found that increasing the sintering temperature from 750 to 850°C leads to increases in shrinkage, densities and microwave dielectric properties (≈ 20 for εr and >8000 for Q*f0). However, after 850 °C , the values of these properties decreased. It is suggested therefore that this new composite has good potential as a new candidate for low temperature co-fired ceramic (LTCC) materials.

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

2009 ◽  
Vol 66 ◽  
pp. 104-107 ◽  
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.

Effects of ZnO-Bi2O3-B2O3-SiO2 Glass Additive on Dielectric Properties of CaO-Li2O-Sm2O3-TiO2 Microwave Dielectric Ceramics

2010 ◽  
Vol 148-149 ◽  
pp. 1580-1583
Author(s):  
Liu Shuan Yang ◽  
Xiao Wang ◽  
Jin Liang Huang ◽  
Fei Long Li
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
Sintering Behavior ◽  
Second Phase ◽  
Microwave Dielectric Ceramics ◽  
Frequency Shifts ◽  
Glass Addition ◽  
Microwave Dielectric ◽  
Dielectric Ceramics

The effects of ZnO-Bi2O3-B2O3-SiO2(ZBBS) glass addition on the sintering behavior, crystalline phase, microstructure and dielectric properties of 16CaO-9Li2O-12Sm2O3-63TiO2(CLST) ceramics were investigated. The results show that ZBBS glass can effectively decrease the sintering temperature of CLST ceramics to 1 000 °C by liquid phase sintering. With the increase of ZBBS content, the second phase，Sm2Ti2O7 is found and increase, which causes the dielectric constant and dielectric loss of CLST decrease. The temperature coefficient of the resonance frequency shifts to positive. The optimum dielectric properties of r = 71, Tan = 0.006, TCF= 5×10-6/°C were obtained in 10wt% LBS glass-doped CLST ceramics sintered at 1 000 °C for 3 h.

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

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.

Effects of Sintering Temperatures on Microwave Properties of Mg4Nb2O9 Ceramics by the Solid-State Process

2012 ◽  
Vol 499 ◽  
pp. 178-182
Author(s):  
Yi Shan Jiang ◽  
Ying Zi Wang ◽  
Ya Ming Chen ◽  
Yun Long Yue ◽  
Hai Tao Wu
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric Ceramics ◽  
Solid State Method ◽  
Microwave Dielectric ◽  
State Process ◽  
Density Values ◽  
Dielectric Ceramics

Microwave dielectric ceramics of Mg4Nb2O9were prepared by the solid-state method and their microwave dielectric properties and microstructure were investigated in this study. The sintering ability and microwave dielectric properties of Mg4Nb2O9ceramics were studied under various sintering temperatures ranging from 1200°C to 1350°C. As the sintering temperature increased from 1200°C to 1350°C, the density values, the εr values and the Q·ƒ values increased and saturated at 1350°C.The ƒ values were ranged from -48.7 to -57.8 ppm/°C. Due to the increased density and appropriate grain growth the Mg4Nb2O9ceramics sintered at 1350°C had the excellent microwave dielectric properties of εr=12.3, Q·ƒ =108,000GHz and ƒ=-55.3ppm/°C.

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