Microwave Dielectric Properties of LTCC Materials Consisting of BaO-TiO2-SiO2-Al2O3 Glass - BaNd2Ti5O14 Ceramic Composites

2005 ◽  
Vol 486-487 ◽  
pp. 506-509 ◽  
Author(s):  
Yu Jin Kim ◽  
Seong Jin Hwang ◽  
Hyung Sun Kim
Keyword(s):  
Dielectric Properties ◽  
Glass Ceramic ◽  
Microwave Dielectric Properties ◽  
Dielectric Materials ◽  
Ceramic Composites ◽  
Sintering Behavior ◽  
Shape Stability ◽  
Low Dielectric ◽  
Microwave Dielectric ◽  
Quality Factor Q

The desirable characteristics of the microwave materials include excellent dielectric constant εr, low dielectric loss (high quality factor, Q*f0 value), and small temperature coefficient (~0ppm/°C) of resonant frequency (Tf). The advantages of using a glass-ceramic include shape stability during the sintering stage, improved dielectric properties, mechanical strength, and controlled thermal expansivity. In the present study, glass-ceramic compositions consisting of a glass system (BaO-TiO2-SiO2-Al2O3) and a ceramic filer (BaNd2Ti5O14) were prepared. The glass and glass-ceramic compositions were evaluated for sintering behavior such as shrinkage, densities, thermal properties, and microstructures. In addition, the microwave dielectric properties (≈ 15~20 for εr, > 6000 GHz for Q*f0) were determined by a network analyzer at 6-8 GHz. These results suggest that the compositions can be a candidate for LTCC dielectric materials.

Microwave Dielectric Properties of RENbO4 (RE=Y, Yb,Ce) Ceramics

2010 ◽  
Vol 434-435 ◽  
pp. 217-220 ◽  
Author(s):  
Zhi Li Zhang ◽  
Chun Xu ◽  
Qiu Ping Liu
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Quality Factor ◽  
Microwave Dielectric Properties ◽  
Relative Dielectric Constant ◽  
Dielectric Materials ◽  
Sintering Behavior ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Quality Factor Q

In the search of more microwave dielectric materials with high-quality factor (Qf ) and high relative dielectric constant (r), RENbO4 (where RE = Y, Ce, Yb) niobate ceramics were synthesized from a solid-state ceramic route, their sintering behavior and microwave dielectric properties were investigated. All of the RENbO4 ceramics formed a single-phase fergusonite-type structure (monoclinic, with space group I2/c), except CeNbO4. They all have an excellent quality factor and dielectric constant value in range of 20 – 28, and the inherent reasons were analyzed.

scholarly journals Structural, optical and microwave dielectric properties of Ba(Ti1−xSnx)4O9, 0 ≤ x ≤ 0.7 ceramics

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Asad Ali ◽  
Sarir Uddin ◽  
Madan Lal ◽  
Abid Zaman ◽  
Zafar Iqbal ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Low Dielectric ◽  
Microwave Dielectric ◽  
Ceramic Samples ◽  
Red Color ◽  
High Dielectric ◽  
Quality Factor Q

AbstractSn-doped BaTi4O9 (BT4) dielectric ceramics were prepared by a mixed oxide route. Preliminary X-ray diffraction (XRD) structural study shows that the ceramic samples have orthorhombic symmetry with space group (Pnmm). Scanning electron microscopy (SEM) shows that the grain size of the samples decreases with an increase in Sn4+ content. The presence of the metal oxide efficient group was revealed by Fourier transform infrared (FTIR) spectroscopy. The photoluminescence spectra of the ceramic samples reported red color ~ 603, 604, 606.5 and 605 nm with excitation energy ~ 2.06, 2.05, 2.04 and 2.05 eV for Sn4+ content with x = 0.0, 0.3, 0.5, and 0.7, respectively. The microwave dielectric properties of these ceramic samples were investigated by an impedance analyzer. The excellent microwave dielectric properties i.e. high dielectric constant (εr = 57.29), high-quality factor (Qf = 11,852), or low-dielectric loss (3.007) has been observed.

Low-Temperature Firing and Microwave Dielectric Properties of Zn3Nb2O8 Ceramics with CuO-V2O5-Bi2O3

2010 ◽  
Vol 434-435 ◽  
pp. 224-227
Author(s):  
Xu Ping Lin ◽  
Jing Tao Ma ◽  
Bao Qing Zhang ◽  
Ji Zhou
Keyword(s):  
Dielectric Constant ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Relative Density ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
Co Doping ◽  
Microwave Dielectric ◽  
Quality Factor Q

The influence of CuO-V2O5-Bi2O3 addition on the sintering behavior, phase composition, microstructure and microwave dielectric properties of Zn3Nb2O8 ceramics were investigated. The co- doping of CuO, V2O5 and Bi2O3 can significantly lower the sintering temperature of Zn3Nb2O8 ceramics from 1150°C to 900°C. The Zn3Nb2O8-0.5wt% CuO-0.5wt% V2O5-2.0wt% Bi2O3 ceramic sintered at 900°C showed a relative density of 97.1%, a dielectric constant (εr) of 18.2, and a quality factor (Q×f) of 36781 GHz. The dielectric properties in this system exhibited a significant dependence on the relative density, content of additives and sintering temperature. The relative density and dielectric constant (εr) of Zn3Nb2O8 ceramics increased with increasing CuO-V2O5-Bi2O3 additions. And also the relative density and dielectric constant of Zn3Nb2O8 ceramics increased by the augment of the sintering temperature.

Sintering Behavior, Microstructure and Microwave Dielectric Properties of Novel Temperature Stable Li3Mg2NbO6–tio2 Composite Ceramics

MRS Advances ◽  
2019 ◽  
Vol 4 (1) ◽  
pp. 33-40
Author(s):  
Gang Wang ◽  
Dainan Zhang ◽  
Huaiwu Zhang
Keyword(s):  
Dielectric Properties ◽  
Bulk Density ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
Low Loss ◽  
Positive Direction ◽  
Dense Microstructure ◽  
Solid State Route ◽  
Microwave Dielectric ◽  
Quality Factor Q

AbstractA novel series of temperature stable Li3Mg2NbO6–xTiO2 ceramics were prepared by the conventional solid-state route. The effects of TiO2 addition on the sintering behavior, phase composition, microstructure and microwave dielectric properties were investigated systematically. The dense microstructure could be obtained in low TiO2 content (x=0.1) samples sintered at 1100 °C. The dielectric constant εr was attributed to the bulk density and TiO2 content. The variation in Q×f values is related to the bulk density, and improved values could be obtained for Li3Mg2NbO6–0.1TiO2 ceramics. The quality factor (Q×f) had a maximum for x=0.1 and the temperature coefficient of resonant frequency (τf) value shifted towards positive direction with the increase of TiO2 addition. Notably, Li3Mg2NbO6–0.1TiO2 ceramics sintered at 1100 °C possessed excellent microwave dielectric properties: εr=15, Q×f =74,000 GHz(9.93GHz), τf= −3.4 ppm/°C, which made the ceramics as promising low loss and temperature stable candidates for millimeter-wave applications.

Microwave dielectric properties of glass–ceramic composites for low temperature co-firable ceramics

2003 ◽  
Vol 79 (2-3) ◽  
pp. 129-134 ◽  
Author(s):  
Cheng-Sao Chen ◽  
Chen-Chia Chou ◽  
Wei-Jan Shih ◽  
Kuo-Shung Liu ◽  
Chang-Shun Chen ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Low Temperature ◽  
Glass Ceramic ◽  
Microwave Dielectric Properties ◽  
Ceramic Composites ◽  
Microwave Dielectric

Effect of CuO-Bi2O3 Co-Doping on Microwave Dielectric Properties of Ba4Sm9.33Ti18O54 Ceramics

2011 ◽  
Vol 197-198 ◽  
pp. 548-551
Author(s):  
Zhi Lan Tang ◽  
Chun Ying Shen ◽  
Zhao Xi Li ◽  
Jian Yang ◽  
Tai Qiu
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Solid State Reaction Method ◽  
Liquid Phase Sintering ◽  
Sintering Behavior ◽  
Conventional Solid State Reaction ◽  
Co Doping ◽  
Microwave Dielectric ◽  
Bst Ceramics ◽  
Quality Factor Q

Ba4Sm9.33Ti18O54(BST) ceramics were prepared by conventional solid-state reaction method. The effect of CuO-Bi2O3co-doping on the sintering behavior and microwave dielectric properties of BST ceramics has been investigated. The results indicated that when the total addition of CuO-Bi2O3doping agent was 1.0wt%, the sintering temperature of BST ceramics was reduced to 1240°C as a result of liquid-phase sintering effect derived from CuBi2O4. When the total addition of CuO-Bi2O3was fixed at 1.0wt%, the microwave dielelctric properties of BST were improved by adjusting the mass percentage of Bi2O3. With the increase of Bi2O3amount from 20wt% to 80wt%, the dielectric constant (εr) decreased, the quality factor (Q•f) increased and the temperature coefficient of resonant frequency (τf) shifted from negative value to positive value. The excellent microwave dielectric properties of εr=82.51, Q•f=7878GHz and τf=+6.02ppm/ were obtained for the sample with Bi2O3amount of 80wt% when sintered at 1240°C for 3h.

scholarly journals Structural, Optical and Microwave Dielectric Properties of Ba(Ti1-xSnx)4O9, 0 ≤ x ≤ 0.7 Ceramics

2021 ◽  
Author(s):  
Asad Ali ◽  
Sarir Uddin ◽  
Madan Lal ◽  
Abid Zaman ◽  
Zafar Iqbal ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Orthorhombic Symmetry ◽  
X Ray Diffraction ◽  
Microwave Ceramics ◽  
Low Dielectric ◽  
Microwave Dielectric ◽  
Red Color ◽  
High Relative Permittivity ◽  
Quality Factor Q

Abstract Sn-doped BaTi4O9 (BT4) microwave ceramics were prepared by a mixed oxide route. Preliminary X-ray diffraction (XRD) structural study shows that the samples have orthorhombic symmetry with space group (Pnmm). Scanning electron microscopy (SEM ) shows that the grain size of the samples decreases with increasing Sn4+ contents. The presence of the metal oxide efficient group was revealed by Fourier transform infrared (FTIR) spectroscopy. The Photoluminescence spectra of the samples reported red color ~ 603, 604, 606.5 and 605 nm with excitation energy ~ 2.06, 2.05, 2.04 and 2.05 eV for Sn content at x = 0.0, 0.3, 0.5, and 0.7, respectively. The microwave dielectric properties of all the samples were investigated by an impedance analyzer. The excellent microwave dielectric properties i.e. high relative permittivity (εr = 57.29), high-quality factor (Qf = 11,852), and low-dielectric loss (3.007) has been observed.

scholarly journals Sintering behavior and microwave dielectric properties of CaTi1-x(Nb1/2Al1/2)xO3

2021 ◽  
Vol 1 (4) ◽  
pp. 197-201
Author(s):  
Akbar Khan ◽  
Asif Ali ◽  
Izaz Khan
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
X Rays ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Microwave Dielectric ◽  
Raman Modes ◽  
Xrd Patterns ◽  
Quality Factor Q

CaTi1-x(Nb1/2Al1/2)xO3 with x=0.1-0.5 ceramics were processed  through solid state sintering. X-rays diffraction (XRD) patterns of the compositions showed that the samples have orthorhombic crystal structure with symmetry (Pbnm). The symmetry was further confirmed using Raman spectroscopy. A total of 13 Raman modes were detected, which were in agreement with the XRD results. Microstructure analysis of the samples showed porosity in the samples, presumably due to the substitution of Al, having high melting point. As the concentration of Al and Nb increased, relative permittivity (er), quality factor (Q×fo) and temperature coefficient of resonance frequency decreased. Optimum microwave dielectric properties were achieved for the composition x=0.5 sintered at 1650 °C for 8 h i.e., er ~27.09, Q×fo ~17378 GHz and tf ~ -2.5 ppm/°C.

Sintering behavior and microwave dielectric properties of B2O3-La2O3-MgO-TiO2 based glass-ceramic for LTCC applications

2018 ◽  
Vol 210 ◽  
pp. 113-116 ◽  
Author(s):  
Haishen Ren ◽  
Mingzhao Dang ◽  
Huijun Wang ◽  
Tianyi Xie ◽  
Shaohu Jiang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Glass Ceramic ◽  
Microwave Dielectric Properties ◽  
Sintering Behavior ◽  
Microwave Dielectric

Densification and Dielectric Properties of Glass/Ceramic Composites Sintered with Various Borosilicate Glass

2007 ◽  
Vol 544-545 ◽  
pp. 961-964 ◽  
Author(s):  
Sang Ok Yoon ◽  
Kwan Soo Kim ◽  
Shin Kim ◽  
Sang Heung Shim ◽  
Jong Guk Park
Keyword(s):  
Dielectric Properties ◽  
Borosilicate Glass ◽  
Microwave Dielectric Properties ◽  
Softening Temperature ◽  
Ceramic Composites ◽  
Sintering Behavior ◽  
Second Phase ◽  
Microwave Dielectric ◽  
Lead Zinc ◽  
Sintering Characteristics

Al2O3 and TiO2 were sintered with three types (lead, zinc, bismuth) of borosilicate glass. Their microwave dielectric properties and sintering behavior were investigated as functions of glass type, glass addition (10~50 vol%) and sintering temperature (600~950°C for 2 hrs). Sintering characteristics were well described in terms of softening temperature, second phase, and excessive liquid. In particular, Bi2O3 addition to the glass enhanced reaction with Al2O3 and TiO2 to form liquid phase and second phase. In terms of dielectric properties glass/Al2O3 composites for application to substrates while glass/TiO2 composites for filters were shown to be appropriate.

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