Structure, Dielectric Properties, and Applications of CaTiO3-Modified Ca4MgNb2TiO12 Ceramics at Microwave Frequency

Huang, Cheng−Liang; Tseng, Yu Wei

doi:10.1111/j.1551-2916.2010.04328.x

Cited by 9 publications

(7 citation statements)

References 22 publications

(35 reference statements)

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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%

“…However, many reports also accused the variation of Q × f to dielectric constant 6 , abnormal grain growth 10 , density 11,14,16 , lattice defect concentration 13 , microtopography 30 , phase constitution 56 , packing fraction 15 , reacting element evaporation 54 , and so on. According to equations (8) and (19), Q × f is independent of the dielectric constant but the quality factor Q depends on it.…”

Section: Resultsmentioning

confidence: 99%

“…MgTiO 3 -MgTa 2 O 6 , k = 2 10 ; Group II ( Rε r 21 ~ 2–5): 4. Ca 4 MgNb 2 TiO 12 -CaTiO 3 , k = 0.25; 11 5. ZnNb 2 O 6 -TiO 2 k = −1 12 ; 6.…”

Section: Resultsmentioning

confidence: 99%

“…As a result, only the tendency of dielectric constant variation can be roughly estimated if the molecule or ion with non-cubic symmetry 2,5,35 . The quality factor change of the ionic substitution is usually attributed to the grain size 20,21,23 , porosity 11,12 , structure 24 , phase evolution 5 , internal strain 2,36–38 , material conductivity 39 and so on. Huang 10 et al .…”

Section: Introductionmentioning

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%

“…MgTiO 3 -MgTa 2 O 6 , k = 2 10 ; Group II ( Rε r 21 ~ 2–5): 4. Ca 4 MgNb 2 TiO 12 -CaTiO 3 , k = 0.25; 11 5. ZnNb 2 O 6 -TiO 2 k = −1 12 ; 6.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

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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“…The demand for developing new low-cost of microwave ceramics for such microwave communication applications must have a moderate relative permittivity (e r ), high dielectric Q Â f value (Q Â f > 5000 GHz), and temperature coefficient of resonant frequency close to zero (t f $ 0 ppm/_C) [1,2]. Moreover, a rapid growth of the cell phone and wireless communication markets in recent years has further led to extensive research and development in the area of microwave dielectrics with a high Q Â f [1][2][3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Structure, dielectric properties, and applications of (Na0.5Sm0.5)TiO3-modified (Mg0.95Ni0.05)TiO3 ceramics at microwave frequency

Shen

Lin

Pan

2015

Materials Research Bulletin

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List of Low‐Loss Ceramic Dielectric Materials and Their Properties

2017

Microwave Materials and Applications 2V Set

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AbbreviationsST = sintering temperature ( • C) r = relative permittivity , f = measurement frequency (GHz) f = coefficient of temperature variation of resonant frequency (ppm/ • C) No. = serial number Qf = quality factor frequency product (GHz)The table lists the key property data of microwave dielectric materials available from published materials. These data are the relative permittivity ( r ), the product of the Q-factor and the frequency (Qf ), the frequency of measurement (f), and the temperature coefficient of the resonant frequency ( f ). In tabulating these data, we make no judgment on the measurement method and the reliability of the result. It is known that the ceramic properties such as porosity, grain size, raw materials used, impurities, measurement methods, and equipment used for measurements affect the dielectric properties and readers should be aware that exact comparison of data on materials of identical composition and manufactured in different laboratories using different processing conditions and measured by different methods would be expected to lead to small variations in properties. The data of dielectric measurements carried out using impedance methods at low (MHz) frequency is excluded as the errors in these methods mean that a loss tangent less than 10 −3 is unreliable. The data are arranged in the order of increasing relative permittivity. The quality factor of the microwave dielectric ceramics decrease significantly with increasing relative permittivity, as shown in Figure A.1. The inset in the figure shows the variation of quality factor frequency product with Microwave Materials and Applications, First Edition. Edited by Mailadil T. Sebastian, Rick Ubic and Heli Jantunen.

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Structure, Dielectric Properties, and Applications of CaTiO3-Modified Ca4MgNb2TiO12 Ceramics at Microwave Frequency

Cited by 9 publications

References 22 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

Structure, dielectric properties, and applications of (Na0.5Sm0.5)TiO3-modified (Mg0.95Ni0.05)TiO3 ceramics at microwave frequency

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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