Microwave dielectric properties of (1−x)ZnTa2O6−xMgNb2O6 ceramics

Fu, Baojian; Zhang, Yingchun; Yang, Hui

doi:10.1016/j.ceramint.2012.10.218

Cited by 20 publications

(16 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ba 2 CaWO 6 -Ba 2 SrWO 6 , k = 4 18 ; 3. ZnNb 2 O 6 -MgTa 2 O 6 , k = 10 19 ; 4. Ca 4/5 Sr 1/5 TiO 3 -Li 1/2 Nd 1/2 TiO 3 , k = 5 20 ; Group II ( Rε r 21 ~ 2–8): 5.…”

Section: Resultsunclassified

See 1 more Smart Citation

Determining the Quality Factor of Dielectric Ceramic Mixtures with Dielectric Constants in the Microwave Frequency Range

Chen

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Microwave dielectric ceramic materials are extensively utilized in microwave applications because of their high dielectric constants and quality factors. These applications also require ceramics of zero temperature coefficients at the resonant frequency (τ f), which can be realized through mixing a ceramic that one is interested in with another ceramic with −τ f, or by performing the ionic substitution. With the mixing/ionic substitution, it is indispensable to compute the quality factors precisely. Previous study indicates that the quality factor depends on the grain size, porosity, internal strain, structure, phase evolution, and conductivity etc. Here we derive a quality factor formula based on the definition, which works very well for multiphase composites, single phase solid solutions, and equivalent ionic substituted single phase materials. Our formula calculation and fits to the previous experimental results demonstrate that the quality factor of the ceramic mixtures strongly depend on the dielectric constants and the dielectric constant variation index. Our results suggest that the impacts from grain size, porosity, and internal strain etc. can be summarized to the dielectric constant or dielectric constant variation index, which is of great importance for future design of high performance microwave dielectric ceramics.

show abstract

“…Ba 2 CaWO 6 -Ba 2 SrWO 6 , k = 4 18 ; 3. ZnNb 2 O 6 -MgTa 2 O 6 , k = 10 19 ; 4. Ca 4/5 Sr 1/5 TiO 3 -Li 1/2 Nd 1/2 TiO 3 , k = 5 20 ; Group II ( Rε r 21 ~ 2–8): 5.…”

Section: Resultsunclassified

“…The solid solution can be treated as the ionic substitution situation at some circumstances 4,18,19 . When the ionic substitution is performed, the original phase can be maintained.…”

Section: Introductionmentioning

confidence: 99%

Determining the Quality Factor of Dielectric Ceramic Mixtures with Dielectric Constants in the Microwave Frequency Range

Chen

et al. 2017

Sci Rep

View full text Add to dashboard Cite

show abstract

“…One of the most effective and widely used methods for obtaining a zero temperature coefficient is to combine two phases with τ f of opposite signs via

{normalτ}_{f} = false(1 - x false) {normalτ}_{f_{1}} + x {normalτ}_{f_{2}},

where x denotes volume molar ratios and

τ_{f_{1}}

and

τ_{f_{2}}

have opposite signs . Most of the reported τ f results fit well with Equation while the variation of the dielectric constant and quality factor always depends on whether the solid solution is formed or not . If two phases coexist, the Q×f can usually be easily predicted as in Refs.…”

Section: Introductionmentioning

confidence: 84%

Microwave dielectric properties of (1‐x)Ba_3.75Nd_9.5Cr_0.25Nb_0.25Ti_17.5O₅₄–xNdAlO₃ ceramics

et al. 2017

View full text Add to dashboard Cite

This study presents the microwave dielectric properties calculation of (1-x)Ba 3.75 Nd 9.5 Cr 0.25 Nb 0.25 Ti 17.5 O 54 -xNdAlO 3 ceramics where x denotes the volume molar fraction. From X-ray diffraction results, the solid solution limit is calculated to be about 0.76, where it forms a single BaNd 2 Ti 4 O 12 phase in Region I (0 ≤ x ≤ 0.76), and both BaNd 2 Ti 4 O 12 and NdAlO 3 coexist in Region II (0.76 < x < 1). The solid solution limit is confirmed by independently calculating it from the dielectric constant data. There is less than 4 % deviation between the measured dielectric constant (ε r ) and the one calculated from the Maxwell-Wagner formula. The total quality factor (Q) remains almost constant in Region I and increases rapidly with the volume molar fraction of NdAlO 3 in Region II. The measured Q×f, where f is the resonant frequency, is also consistent with the calculated value in both regions. The temperature coefficient at the resonant frequency is -1.4 ppm/ o C, which agrees well with the calculated value of 0 ppm/ o C. In addition, we observed a close correlation between the bulk density and the phase evolution.

show abstract

“…In a word, the ceramic sintered at 830 o C has a dense microstructure and exhibits good microwave dielectric properties with ε r =9.53, Q×f =32,820GHz (at ~11GHz) and τ f =-90.0 ppm/ o C. 10 The comparison of properties between NaMg 4 V 3 O 12 ceramic and the previous systems is listed in Table 4. The aluminate and silicate compounds demonstrate good microwave dielectric properties with low relative dielectric constant (ε r ) and high quality factor (Q×f).…”

Section: (3) Sintering Ability and Microwave Dielectric Properties Ofmentioning

confidence: 99%

“…Many ceramics have been reported as potential candidates for millimeter-wave devices, such as MgSiO 3 [5], Al 2 O 3 [6,7], ZnAl 2 O 4 [8], ZnNb 2 O 6 [9], (1-x)ZnTa 2 O 6 -xMgNb 2 O 6 [10] etc. However, higher sintering temperature restricted the further application of these ceramics in low temperature co-firing ceramics devices [11].…”

Section: Introductionmentioning

confidence: 99%

Structural evolution, low-firing characteristic and microwave dielectric properties of magnesium and sodium vanadate ceramic

Gong

Zhou

et al. 2015

Ceramics International

View full text Add to dashboard Cite

Microwave dielectric properties of (1−x)ZnTa2O6−xMgNb2O6 ceramics

Cited by 20 publications

References 17 publications

Determining the Quality Factor of Dielectric Ceramic Mixtures with Dielectric Constants in the Microwave Frequency Range

Determining the Quality Factor of Dielectric Ceramic Mixtures with Dielectric Constants in the Microwave Frequency Range

Microwave dielectric properties of (1‐x)Ba_3.75Nd_9.5Cr_0.25Nb_0.25Ti_17.5O₅₄–xNdAlO₃ ceramics

Structural evolution, low-firing characteristic and microwave dielectric properties of magnesium and sodium vanadate ceramic

Contact Info

Product

Resources

About

Microwave dielectric properties of (1−x)ZnTa2O6−xMgNb2O6 ceramics

Cited by 20 publications

References 17 publications

Determining the Quality Factor of Dielectric Ceramic Mixtures with Dielectric Constants in the Microwave Frequency Range

Determining the Quality Factor of Dielectric Ceramic Mixtures with Dielectric Constants in the Microwave Frequency Range

Microwave dielectric properties of (1‐x)Ba3.75Nd9.5Cr0.25Nb0.25Ti17.5O54–xNdAlO3 ceramics

Structural evolution, low-firing characteristic and microwave dielectric properties of magnesium and sodium vanadate ceramic

Contact Info

Product

Resources

About

Microwave dielectric properties of (1‐x)Ba_3.75Nd_9.5Cr_0.25Nb_0.25Ti_17.5O₅₄–xNdAlO₃ ceramics