Densification, microstructural evolution and dielectric properties of Ba6−3x(Sm1−yNdy)8+2xTi18O54 microwave ceramics

Wang, Sea‐Fue; Hsu, Yung−Fu; Wang, Yuh Ruey; Cheng, Liang; Hsu, Ya Chi; Chu, Jinn P.; Huang, Chen‐Bin

doi:10.1016/j.jeurceramsoc.2005.03.261

Cited by 30 publications

(11 citation statements)

References 27 publications

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“…Typical microwave ceramics are included, e.g. MgTiO 3 10,53,54 , BaTi 4 O 9 55 , Ba 6-3x Nd 8+2x Ti 18 O 54 4,30,48 , TiO 2 6,8,9,13,15,56,57 , CaTiO 3 11,14,16,22,24,49,50,58,59 , and Li 1/2 Nd 1/2 TiO 3 17,20,22 . These 3 groups are: 1. multiphase composites, 2. single phase solid solutions, 3. equivalent ionic substituted single phase ceramics.…”

Section: Resultsmentioning

confidence: 99%

“…As the substitution molar ratio increases, the microstructure or the parameters of the original molecular will systemically change. Therefore, the quality factor versus the substitution content is currently attributed to interfacial mismatch 44 , mode vibration 35,58 , phase constitution 45,50 , relative density 46 , grain size 47 , dielectric constant 48 , and crystal structure 59 etc . The interfacial mismatch can be related to grain size which corresponds to the two-dimensional defect leading to the dielectric loss 44 .…”

Section: Resultsmentioning

confidence: 99%

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

Chen

et al. 2017

Sci Rep

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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

Chen

et al. 2017

Sci Rep

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“…The amount of Nd 2 Ti 2 O 7 phase formed increased but the BNBT phase decreased with increasing BB45SZ. Wang et al [11] also reported that a minor pyrochlore (Sm,Nd) 2 Ti 2 O 7 phase was observed during preparing Ba 4.5 (Sm 0.5 Nd 0.5 )Ti 18 O 54 ceramics. Fig.…”

Section: Methodsmentioning

confidence: 98%

Influence of glass additives on the sintering behavior and dielectric properties of BaO·(Nd0.8Bi0.2)2O3·4TiO2 ceramics

Hsiang

Chen

2009

Journal of Alloys and Compounds

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“…A dielectric constant of 19.3, a quality factor (Q 9 f) of 43,300 GHz, and a temperature coefficient of resonant frequency of -57 ppm/°C were obtained when Nd(Mg 0.5 Sn 0.5 )O 3 ceramics were sintered at 1,550°C for 4 h [10]. Since several solid solutions combining two compounds were found to have a higher value of Q 9 f compared with that of both end members [11][12][13] and the ionic radius of Zn 2? (0.074 nm) is similar to that of Mg 2?…”

Section: Introductionmentioning

confidence: 99%

Influence of Ca0.8Sr0.2TiO3 on the microstructures and microwave dielectric properties of Nd(Mg0.4Zn0.1Sn0.5)O3 ceramics

Chen

Yao

2011

J Mater Sci: Mater Electron

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The influence of Ca 0.8 Sr 0.2 TiO 3 on the microstructures and microwave dielectric properties of Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 ceramics were investigated by the conventional solid-state method. The X-ray diffraction peaks of (1 -x)Nd(Mg 0.4 Zn 0.1 Sn 0.5 )O 3 -xCa 0.8 Sr 0.2 TiO 3 ceramic system shifted to higher angles as x increased. The dielectric constant increased from 31.8 to 47.7, the quality factor (Q 9 f) decreased from 54,200 to 42,800 GHz, and the temperature coefficient of resonant frequency (s f ) increased from -43 to ?41 ppm/°C as x increased from 0.5 to 0.7 when (1 -x)Nd(Mg 0.4 Zn 0.1 Sn 0.5 ) O 3 -xCa 0.8 Sr 0.2 TiO 3 ceramic system sintered at 1,600°C for 4 h.

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Densification, microstructural evolution and dielectric properties of Ba6−3x(Sm1−yNdy)8+2xTi18O54 microwave ceramics

Cited by 30 publications

References 27 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

Influence of glass additives on the sintering behavior and dielectric properties of BaO·(Nd0.8Bi0.2)2O3·4TiO2 ceramics

Influence of Ca0.8Sr0.2TiO3 on the microstructures and microwave dielectric properties of Nd(Mg0.4Zn0.1Sn0.5)O3 ceramics

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