scholarly journals Temperature Stable, High-Quality Factor Li2TiO3-Li4NbO4F Microwave Dielectric Ceramics

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 741
Author(s):  
Shangrui Xu ◽  
Juan Jiang ◽  
Zelai Cheng ◽  
Xiangyi Chen ◽  
Shikuan Sun ◽  
...  
Keyword(s):  
Quality Factor ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric Ceramics ◽  
High Quality ◽  
Practical Applications ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
Dielectric Ceramics

In this work, (1-x)Li2TiO3-xLi4NbO4F ceramics were prepared by the conventional solid-state ceramic route. With the increase of Li4NbO4F content, the phase structure transformed from ordered monoclinic to disordered cubic. By increasing Li3NbO4F content, the temperature coefficient of resonant frequency (τf) was successfully adjusted closer to zero, while the dielectric constant (εr) and microwave quality factor (Qf) decreased to some degree. Outstanding microwave dielectric properties with a εr = 18.7, Qf = 61,388 GHz (6.264 GHz), and τf = 0.9 ppm/°C were obtained for 0.9Li2TiO3-0.1Li4NbO4F ceramics sintered at 1050 °C for 2 h, which indicated that these ceramics are suitable for practical applications in the field of microwave substrates and components.

High quality factor microwave dielectric ceramics in the (Mg1/3 Nb2/3 )O2 -ZrO2 -TiO2 ternary system

2017 ◽  
Vol 100 (9) ◽  
pp. 3982-3989 ◽  
Author(s):  
Wen-Bo Li ◽  
Di Zhou ◽  
Li-Xia Pang ◽  
Yan-Zhu Dai ◽  
Ze-Ming Qi ◽  
...  
Keyword(s):  
Ternary System ◽  
Quality Factor ◽  
High Quality Factor ◽  
Microwave Dielectric Ceramics ◽  
High Quality ◽  
Microwave Dielectric ◽  
Dielectric Ceramics

scholarly journals Zn-modified Li3Mg2SbO6 microwave dielectric ceramics with high quality factor

2020 ◽  
Author(s):  
Hongyang Zhang ◽  
Cheng Liu ◽  
Liang Shi ◽  
Wenwen Wang ◽  
Wenhao Xu ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Dielectric Properties ◽  
Grain Size Effect ◽  
Microwave Dielectric Ceramics ◽  
Sintering Process ◽  
High Quality ◽  
High Q ◽  
Microwave Dielectric ◽  
Pure Phase ◽  
Dielectric Ceramics

Abstract Well-densified Li3(Mg1 − xZnx)2SbO6 (0.00 ≤ x ≤ 0.08) microwave dielectric ceramics were synthesized via a two-stage sintering process. The effects of Zn2+ substitution on the microstructure and microwave dielectric properties were investigated. All samples were identified as pure phase via the XRD detection. Remarkable microwave dielectric properties with a near-zero τf value were obtained in the Li3(Mg1 − xZnx)2SbO6 (x = 0.04) sample sintered at 1325 ℃ for 5 h: εr = 7.8, Q × f = 97,719 GHz (13.4 GHz), τf =-6 ppm/℃. The high Q × f value was suggested to relate with the dense morphology and grain size effect. All experimental results indicate that the Li3(Mg1 − xZnx)2SbO6 ceramics are promising for 5G communication applications.

Two novel A4B3O12-type microwave ceramics with high-Q and near-zero τf

2010 ◽  
Vol 25 (7) ◽  
pp. 1239-1242 ◽  
Author(s):  
Liang Fang ◽  
Chunchun Li ◽  
Xiyang Peng ◽  
Changzheng Hu ◽  
Bolin Wu
Keyword(s):  
Quality Factor ◽  
Microwave Dielectric Properties ◽  
Base Stations ◽  
Microwave Dielectric Ceramics ◽  
Practical Application ◽  
Microwave Ceramics ◽  
Promising Candidate ◽  
High Q ◽  
Microwave Dielectric ◽  
Dielectric Ceramics

Two novel La3+ and Ti4+ cosubstituted Sr3LaNb3O12 ceramics, Sr2La2TiNb2O12 and SrLa3Ti2NbO12, were prepared and the effect of substitution on the microwave dielectric properties was investigated. Results showed that as the amounts of substitution increased, dielectric constant (εr) increased from 36 to 41, and temperature coefficient of resonant frequency (τf) improved from −9 to 3 ppm/°C, whereas the quality factor (Q×f) decreased from 45,000 to 33,600 GHz. A temperature-stable microwave dielectric ceramics SrLa3Ti2NbO12 with τf of 3 ppm/°C, εr of 41, Q×f of 33,600 GHz was obtained; it might be a promising candidate for practical application in base stations if the quality factor is enhanced beyond 40,000 GHz.

scholarly journals Influence of sintering temperature on secondary phases formation and microwave dielectric properties of Ca2Ce2Ti5O16 ceramics

2014 ◽  
Vol 32 (2) ◽  
pp. 297-300
Author(s):  
Abdul Manan ◽  
Sami Khan ◽  
Ibrahim Qazi
Keyword(s):  
Dielectric Properties ◽  
Sintering Temperature ◽  
Microwave Dielectric Properties ◽  
Xrd Analysis ◽  
Network Analyzer ◽  
Secondary Phases ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Dielectric Ceramics

AbstractCa2Ce2Ti5O16 dielectric ceramics prepared by conventional solid-state ceramic route was investigated. Phase composition and microwave dielectric properties were measured using XRD and Vector network analyzer, respectively. XRD analysis of the calcined and sintered samples revealed the formation of CeO2 and another unidentified phase (that vanished at ≥ 1400 °C) as secondary phases along with the parent Ca2Ce2Ti5O16 phase. The amount of the parent Ca2Ce2Ti5O16 phase increased with increasing sintering temperature from 1350 °C to 1450 °C accompanied by a decrease in the apparent density. The density decreased but ɛr and Qu f o increased with sintering temperature. An er ~ 81.5, Qu fo ~5915 GHz and t f ~ 219 GHz were achieved for the sample sintered at 1450 °C.

Novel glass free ceramic for LTCC applications

2012 ◽  
Vol 2012 (CICMT) ◽  
pp. 000303-000306
Author(s):  
Dhanesh Thomas P. Abhilash ◽  
M. T. Sebastian
Keyword(s):  
Thermal Expansion ◽  
Dielectric Properties ◽  
Volume Fraction ◽  
Coefficient Of Thermal Expansion ◽  
Microwave Dielectric Properties ◽  
Microwave Dielectric ◽  
State Ceramic ◽  
Solid State Ceramic Route ◽  
Ceramic Route ◽  
Tio2 Addition

The LiZnPO4 ceramic has been prepared by the conventional solid state ceramic route. The ceramic sintered at 825 °C has an εr of 4.9, Qu×f of 65400 GHz, and τf of −80 ppm/°C. The LiZnPO4 ceramic shows low coefficient of thermal expansion (CTE) of 5.3 ppm/°C. The slightly large negative τf of LiZnPO4 has been tuned nearly to zero with TiO2 addition. LiZnPO4-TiO2 composite containing 0.15 volume fraction TiO2 sintered at 925 °C shows good microwave dielectric properties: εr = 7.8, Qu×f = 39800 GHz and τf = −6.8 ppm/°C. LiZnPO4−0.15 Vf TiO2 composite shows a CTE of 6.9 ppm/°C.

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