Microwave dielectric properties of low loss microwave dielectric ceramics: A0.5Ti0.5NbO4 (A=Zn, Co)

Tseng, Ching‐Fang

doi:10.1016/j.jeurceramsoc.2014.06.010

Cited by 82 publications

(20 citation statements)

References 18 publications

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“…As known, the e r value is influenced by the dielectric polarizability, relative density, crystal structure, second phase, and the additives. 22,28 Since there is no second phase formed or change in crystal structure, and the dielectric polarizability of ZTN does not change, the relative density and the additives should be responsible for the variation in e r value. For instance, the ceramic sintered at 900°C with 0.5 wt.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis of Zn_0.5Ti_0.5NbO₄ microwave dielectric ceramics with Li₂O‐B₂O₃‐SiO₂ glass for LTCC application

Zhang

2017

Int J of Appl Glass Sci

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Single phase of dense ixiolite structure Zn0.5Ti0.5NbO4 (ZTN) microwave dielectric ceramics were synthesized at low temperature (850°C‐900°C) via solid state reaction with small amount of Li2O‐B2O3‐SiO2 (LBS) glass. There is a liquid phase generated by LBS at about 760°C, which significantly enhances the shrinkage and decreases the activation energy. And with the assistance of liquid phase, single phase of ZTN with orthorhombic structure is detected, sintering temperature of ceramics drops from 1125°C to 850°C and still maintain high relative density (>97%) with great microwave dielectric properties (εr ~ 34.32, Q×f ~ 17740 GHz). Ceramics with 0.5 wt. % LBS cannot be sintered and densified, and the lack of densification determines a lower dielectric constant, large dielectric loss, and undetectability of temperature coefficient of resonant frequency. With the increase in LBS, a dense structure can be formed, but the deterioration of performance should be mainly attributed to the variation in LBS glass content.

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Section: Resultsmentioning

confidence: 99%

“…where 1,2, n, A, V, N, W represents ZTN, LBS glass, number of atoms in the unit cell, atomic weight, volume of unit cell, Avogadro number and weight fraction, respectively. The relative densities of the composite ceramics were obtained from the following:

{normalρ}_{normalrelative} = \frac{ρ_{bulk}}{ρ_{theo}}

…”

Section: Methodsmentioning

confidence: 99%

Synthesis of Zn_0.5Ti_0.5NbO₄ microwave dielectric ceramics with Li₂O‐B₂O₃‐SiO₂ glass for LTCC application

Zhang

2017

Int J of Appl Glass Sci

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“…In addition, a significant difference in quality factor ( Q × f ) of the listed corundum‐type compounds can be observed, especially between the niobates and tantalates. It is well‐known that band valence have great effects on the microwave dielectric properties . Thus, it is proposed that the difference in quality factor might be related to the band valence.…”

Section: Resultsmentioning

confidence: 99%

A Novel Low‐Firing and Low Loss Microwave Dielectric Ceramic Li₂Mg₂W₂O₉ with Corundum Structure

et al. 2015

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The crystal structure and microwave dielectric properties of a novel low-firing compound Li 2 Mg 2 W 2 O 9 were investigated in this study. The phase purity and crystal structure were investigated using X-ray diffraction analyses and Rietveld refinement. The best microwave dielectric properties of the ceramic with a low permittivity (e r )~11.5, a quality factor (Q 3 f) 31 900 GHz (at 10.76 GHz) and a temperature coefficient of the resonant frequency (s f )~-66.0 ppm/°C were obtained at the optimum sintering temperature (920°C). CaTiO 3 was added into the Li 2 Mg 2 W 2 O 9 ceramic to obtain a near zero s f , and 0.93Li 2 Mg 2 W 2 O 9 -0.07CaTiO 3 ceramic exhibited improved microwave dielectric properties with a near-zero s f-1.3 ppm/°C, a e r~2 1.6, a high Q u 3 f value~20 657 GHz. The low sintering temperature and favorable microwave dielectric properties make it a promising candidate for LTCC applications.

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“…Thus, it is essential for materials to possess a relatively high dielectric permittivity (usually above 35). Recently, many new microwave dielectric ceramics have been developed to meet the explosive growth of wireless communication industry, e.g., (Ba 0.4 Sr 0.6 )TiO 3 ceramics, Ca[(Ga 1/2 Nb 1/2 ) 0.53 T i0.47 ]O 3 ceramics, Ba 0.6 Sr 0.4 La 4 Ti 4 O 15 –Ba 5 Nb 4 O 15 , and Co 0.5 Ti 0.5 NbO 4 ceramics, as well as (Mg 0.95 Ni 0.5 )Si 2 O 4 ceramic with Li 2 CO 3 –V 2 O 5. Nevertheless, the very microwave ceramics are still difficult to be found that satisfies multiple goals including low sintering temperature, high dielectric permittivity, and high‐quality factor Q × f , as well as near‐zero temperature coefficient of resonant frequency; in turn not fully satisfy the demands for some important communication microwave circuits.…”

Section: Introductionmentioning

confidence: 99%

Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO₃–(1−x)LaAlO₃ Ceramics with LTCC Application

et al. 2016

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xSrTiO 3 -(1Àx)LaAlO 3 ceramics with ZnO-B 2 O 3 sintering aid were prepared by solid-state reaction method leading to a significant decrease in sintering temperature from 1550°C to 1050°C. The structure, microwave dielectric properties, and low-temperature sintering behavior were systematically investigated. The results revealed the relationships among ionic size, ionic polarizability and cell volume.

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Microwave dielectric properties of low loss microwave dielectric ceramics: A0.5Ti0.5NbO4 (A=Zn, Co)

Cited by 82 publications

References 18 publications

Synthesis of Zn_0.5Ti_0.5NbO₄ microwave dielectric ceramics with Li₂O‐B₂O₃‐SiO₂ glass for LTCC application

Synthesis of Zn_0.5Ti_0.5NbO₄ microwave dielectric ceramics with Li₂O‐B₂O₃‐SiO₂ glass for LTCC application

A Novel Low‐Firing and Low Loss Microwave Dielectric Ceramic Li₂Mg₂W₂O₉ with Corundum Structure

Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO₃–(1−x)LaAlO₃ Ceramics with LTCC Application

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Microwave dielectric properties of low loss microwave dielectric ceramics: A0.5Ti0.5NbO4 (A=Zn, Co)

Cited by 82 publications

References 18 publications

Synthesis of Zn0.5Ti0.5NbO4 microwave dielectric ceramics with Li2O‐B2O3‐SiO2 glass for LTCC application

Synthesis of Zn0.5Ti0.5NbO4 microwave dielectric ceramics with Li2O‐B2O3‐SiO2 glass for LTCC application

A Novel Low‐Firing and Low Loss Microwave Dielectric Ceramic Li2Mg2W2O9 with Corundum Structure

Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO3–(1−x)LaAlO3 Ceramics with LTCC Application

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Synthesis of Zn_0.5Ti_0.5NbO₄ microwave dielectric ceramics with Li₂O‐B₂O₃‐SiO₂ glass for LTCC application

Synthesis of Zn_0.5Ti_0.5NbO₄ microwave dielectric ceramics with Li₂O‐B₂O₃‐SiO₂ glass for LTCC application

A Novel Low‐Firing and Low Loss Microwave Dielectric Ceramic Li₂Mg₂W₂O₉ with Corundum Structure

Structure, Microwave Dielectric Properties, and Novel Low‐Temperature Sintering of xSrTiO₃–(1−x)LaAlO₃ Ceramics with LTCC Application