Liquid Phase Sintering and Microwave Dielectric Properties of NdAlO3Ceramics

2002 ◽  
Vol 41 (Part 1, No. 3A) ◽  
pp. 1459-1464 ◽  
Author(s):  
Cheng-Liang Huang ◽  
Yao-Chung Chen
Keyword(s):  
Dielectric Properties ◽  
Liquid Phase ◽  
Microwave Dielectric Properties ◽  
Liquid Phase Sintering ◽  
Microwave Dielectric

Low-Temperature Sintering and Microwave Dielectric Properties of CaWO4-Mg2SiO4 Ceramics

2014 ◽  
Vol 933 ◽  
pp. 12-16 ◽  
Author(s):  
Chung Long Pan ◽  
Ping Cheng Chen ◽  
Tsu Chung Tan ◽  
Wei Cheng Lin ◽  
Chun Hsu Shen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Solid State ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Liquid Phase Sintering ◽  
Low Temperature Sintering ◽  
Sintering Aids ◽  
Sintering Aid ◽  
Microwave Dielectric

The effect of V2O5addition on the microstructures and the microwave dielectric properties of 0.9CaWO4-0.1Mg2SiO4(9CWMS) ceramics prepared by conventional solid-state routes have been investigated. The V2O5were selected as liquid phase sintering aids to lower the sintering temperature of 9CWMS ceramics. A small amount of V2O5(0.25~1 wt%) were used for sintering aid and led to high densification at 1050°C. The dielectric properties of 9CWMS ceramics with V2O5additions are strongly dependent on the densification, the microstructure. As the amount of V2O5additives increased from 0.25 to 1.0 wt%, the dielectric constantsεrdecreased following the trend with density. The quality valuesQdecreased with the increase of V2O5amount for all sintering temperatures. The 0.25 wt% V2O5-doped 0.9CaWO4-0.1Mg2SiO4ceramicssintered at 1080°C for 2 h had the optimum dielectric properties: εr= 5.7;Q×f= 73000 (at 14 GHz).

scholarly journals Sintering Behaviors, Microstructure, and Microwave Dielectric Properties of CaTiO3–LaAlO3 Ceramics Using CuO/B2O3 Additions

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4187 ◽  
Author(s):  
Min-Hang Weng ◽  
Chihng-Tsung Liauh ◽  
Shueei-Muh Lin ◽  
Hung-Hsiang Wang ◽  
Ru-Yuan Yang
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Liquid Phase Sintering ◽  
Sintering Aids ◽  
Sintering Aid ◽  
Microwave Dielectric ◽  
Quality Factor Q

The effect of CuO/B2O3 additions on the sintering behaviors, microstructures, and microwave dielectric properties of 0.95LaAlO3–0.05CaTiO3 ceramics is investigated. It is found that the sintering temperatures are lowered efficiently from 1600 °C to 1350 °C, as 1 wt % CuO, 1 wt % B2O3, and 0.5 wt % CuO +0.5 wt % B2O3 are used as the sintering aids due to the appearance of the liquid phase sintering. The microwave dielectric properties of 0.95LaAlO3–0.05CaTiO3 ceramics with the sintering aid additions are strongly related to the densification and the microstructure of the sintered ceramics. At the sintering temperature of 1300 °C, the 0.95LaAlO3–0.05CaTiO3 ceramic with 0.5 wt % CuO + 0.5 wt % B2O3 addition shows the best dielectric properties, including a dielectric constant (εr) of 21, approximate quality factor (Q × f) of 22,500 GHz, and a temperature coefficient of the resonant frequency (τf) of −3 ppm/°C.

Low Temperature Sinter-Ability of Microwave Dielectric Ceramics 0.4(Ca0.61Nd0.26)TiO3-0.6(Li0.5Sm0.5)TiO3

2008 ◽  
Vol 368-372 ◽  
pp. 176-178
Author(s):  
Xiao Dong Guo ◽  
Zi Long Tang ◽  
Zhong Tai Zhang
Keyword(s):  
Dielectric Properties ◽  
Liquid Phase ◽  
Microwave Dielectric Properties ◽  
Liquid Phase Sintering ◽  
Microwave Dielectric Ceramics ◽  
Phase Effect ◽  
Temperature Sinter ◽  
Sintering Aid ◽  
Microwave Dielectric ◽  
Dielectric Ceramics

Microwave dielectric ceramics 0.4(Ca0.61Nd0.26)TiO3-0.6(Li0.5Sm0.5)TiO3 (CNLST) were prepared by doping CuO as the liquid-phase sintering aid. The effects of CuO on the microstructures and dielectric properties were investigated. Due to the liquid-phase effect, the sintering temperature of CNLST with 0.5wt.% CuO addition has be effectively reduced to 1100°C, while good microwave dielectric properties of εr=83.4, Q•f=3880GHz, τf =2.1ppm/°C.

Effect of Li0.8Ca0.2F1.2 on Sintering and Microwave Dielectric Properties of (Mg0.95Zn0.05)(Ti0.8Sn0.2)O4 Ceramics

2013 ◽  
Vol 538 ◽  
pp. 266-269
Author(s):  
Guo Guang Yao ◽  
Hong Ma ◽  
Xiu Lao Tian
Keyword(s):  
Crystal Structure ◽  
Dielectric Properties ◽  
Liquid Phase ◽  
Microwave Dielectric Properties ◽  
Liquid Phase Sintering ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Dielectric

The effects of Li0.8Ca0.2F1.2 doped on the sinterability, phase constitutions and microwave dielectric properties of (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4 (MZTS) ceramics were investigated. The crystal structure was analyzed using X-ray diffraction. With 3.0 wt% Li0.8Ca0.2F1.2 addition, the densification sintering of MZTS ceramics was significantly lowed from 1325 oC to 1150 oC due to the liquid phase sintering. Secondary phases CaTiO3 and MgO were formed by reaction between MZTS and CaF2. 3.0wt% Li0.8Ca0.2F1.2-doped MZTS ceramics at 1150 oC for 5 h exhibited dielectric properties: εr=13.4, Qxf=46 672.3 GHz (at 9.3 GHz).

Microwave dielectric properties and compatibility with silver of low-fired Ba5Nb4O15 ceramics by BaCu(B2O5) addition

2010 ◽  
Vol 25 (9) ◽  
pp. 1793-1798 ◽  
Author(s):  
Huanfu Zhou ◽  
Hong Wang ◽  
Minghuia Zhang ◽  
Haibo Yang
Keyword(s):  
Dielectric Properties ◽  
Liquid Phase ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Microwave Devices ◽  
Dielectric Ceramic ◽  
Ag Electrode ◽  
Microwave Dielectric

The influence of BaCu(B2O5) (BCB) addition on the sintering temperature and microwave dielectric properties of Ba5Nb4O15 ceramics has been investigated. The addition of small amount of BCB can effectively lower the sintering temperature of Ba5Nb4O15 ceramics from 1400 to 875 °C and induce no obvious degradation of the microwave dielectric properties. The reduced sintering temperature was attributed to the BCB liquid phase. Typically, the 1.5 wt% BCB-added Ba5Nb4O15 ceramic sintered at 875 °C for 2 h exhibited good microwave dielectric properties of Q × f = 28,655 GHz, εr = 40.2, and τf = 60 ppm/°C. The dielectric ceramic demonstrated stability against the reaction with the Ag electrode, which suggests that the ceramics could be applied in multilayer microwave devices requiring low sintering temperatures.

EFFECTS OF B2O3 ADDITION ON SINTERING BEHAVIOR AND MICROWAVE DIELECTRIC PROPERTIES OF Mg4Ta2O9 CERAMICS PREPARED BY THE SOL–GEL METHOD

2016 ◽  
Vol 23 (01) ◽  
pp. 1550090 ◽  
Author(s):  
J. D. GUO ◽  
J. X. BI ◽  
H. T. WU
Keyword(s):  
Dielectric Properties ◽  
Liquid Phase ◽  
Detrimental Effect ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
Phase Effect ◽  
Microwave Dielectric ◽  
Sintering Characteristics

Sintering characteristics and microwave dielectric properties of Mg4Ta2O9–5[Formula: see text]wt% B2O3 ceramics were investigated. With the sintering temperature increasing in the range of 1100[Formula: see text]C–1350[Formula: see text]C, the apparent density, [Formula: see text] and [Formula: see text] values increased firstly and then saturated at 1250[Formula: see text]C with excellent microwave properties: [Formula: see text], [Formula: see text][Formula: see text]GHz and [Formula: see text][Formula: see text]ppm/[Formula: see text]C. Compared to the pure MT ceramics, the B2O3 additives effectively decreased the sintering temperature of MT ceramics and had no detrimental effect on the properties of the MT ceramics due to the liquid phase effect.

The Effect CuO Additive on the Microwave Dielectric Properties of Mg(Zr0.05Ti0.95)O3 Ceramics

2011 ◽  
Vol 687 ◽  
pp. 199-203 ◽  
Author(s):  
Ching Fang Tseng
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Liquid Phase ◽  
Solid State Reaction ◽  
Microwave Dielectric Properties ◽  
Solid State Reaction Method ◽  
Reaction Method ◽  
Microwave Dielectric ◽  
Second Phases

The microwave dielectric properties of the Mg(Zr0.05Ti0.95)O3ceramics with CuO addition were investigated. All specimens were prepared by solid-state reaction method and sintered at 1270-1420°C for 4 h. When CuO was added, the second phases of MgTi2O5, TiO2and liquid phase were produced. For specimens with 1.5 wt% CuO sintered at 1300°C, the dielectric constant,Q´fand tfvalues are 18.2, 223000 GHz and -2 ppm/°C, respectively.

Liquid phase effect of La2O3 and V2O5 on microwave dielectric properties of Mg2TiO4 ceramics

2013 ◽  
Vol 31 (1-2) ◽  
pp. 48-54 ◽  
Author(s):  
R. K. Bhuyan ◽  
T. Santhosh Kumar ◽  
D. Goswami ◽  
A. R. James ◽  
D. Pamu
Keyword(s):  
Dielectric Properties ◽  
Liquid Phase ◽  
Microwave Dielectric Properties ◽  
Phase Effect ◽  
Microwave Dielectric
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