Phase evolution and microwave dielectric properties of TiO2-modified (Mg0.95Co0.05)2TiO4 ceramics

Huang, Cheng Liang; Chen, Jhih Yong

doi:10.1016/j.jallcom.2011.03.046

Cited by 7 publications

(2 citation statements)

References 20 publications

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“…A variety of microwave dielectric ceramics with high Q × f value have been intensively investigated, such as MgTiO 3 , Mg 2 TiO 4 , Ba(Mg,Ta)O 3 , (Zr,Sn)TiO 4 , ZnTiNb 2 O 8 [1][2][3][4][5][6][7]. MgTiO 3 is one of the most popular dielectric materials for microwave devices, due to its high dielectric constant (ε r ∼ 17), high quality factor (Q × f value ∼160,000 GHz) and negative f value (−50 ppm/ • C) [8].…”

Section: Introductionmentioning

confidence: 99%

Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Ding

Liao

2011

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Ding

Liao

2011

Journal of Alloys and Compounds

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“…However, its τ f value is a little large and sintering temperature (around 1400°C) is too high for application in LTCC. Presently, active works have been done to improve its microwave dielectric properties by suitable ions substitution, especially to attain the temperature compensation of resonant frequency by preparing various composites with opposite τ f . For example, Huang and Chen reported that 0.22(Mg 0.95 Co 0.05 ) 2 TiO 4 –0.78TiO 2 sintered at 1240°C exhibits good combination microwave dielectric properties (ε r = 24.77, Q × f = 38 500 GHz, and τ f = −1.3 ppm/°C).…”

Section: Introductionmentioning

confidence: 99%

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg_0.95Zn_0.05)₂(Ti_0.8Sn_0.2)O₄–(Ca_0.8Sr_0.2)TiO₃ Composite Ceramics

2013

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0.9(Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4–0.1(Ca0.8Sr0.2)TiO3 (MZTS–CST) ceramics were prepared by a conventional solid‐state route. The MZTS–CST ceramics sintered at 1325°C exhibited εr = 18.2, Q × f = 49 120 GHz (at 8.1 GHz), and τf = 15 ppm/°C. The effects of LiF–Fe2O3–V2O5 (LFV) addition on the sinterability, phase composition, microstructure, and microwave dielectric properties of MZTS–CST were investigated. Eutectic liquid phases 0.12CaF2/0.28MgF2/0.6LiF and MgV2O6 were developed, which lowered the sintering temperature of MZTS–CST ceramics from 1325°C to 950°C. X‐ray powder diffraction (XRPD) and energy dispersive spectroscopy (EDS) analysis revealed that MZTS and CST coexisted in the sintered ceramics. Secondary phase Ca5Mg4(VO4)6 as well as residual liquid phase affected the microwave dielectric properties of MZTS–CST composite ceramics. Typically, the MZTS–CST–5.3LFV composite ceramics sintered at 950°C showed excellent microwave dielectric properties: εr = 16.3, Q × f = 30 790 GHz (at 8.3 GHz), and τf = −10 ppm/°C.

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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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Phase evolution and microwave dielectric properties of TiO2-modified (Mg0.95Co0.05)2TiO4 ceramics

Cited by 7 publications

References 20 publications

Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg_0.95Zn_0.05)₂(Ti_0.8Sn_0.2)O₄–(Ca_0.8Sr_0.2)TiO₃ Composite Ceramics

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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Phase evolution and microwave dielectric properties of TiO2-modified (Mg0.95Co0.05)2TiO4 ceramics

Cited by 7 publications

References 20 publications

Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Reaction-sintering method for ultra-low loss (Mg0.95Co0.05)TiO3 ceramics

Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg0.95Zn0.05)2(Ti0.8Sn0.2)O4–(Ca0.8Sr0.2)TiO3 Composite Ceramics

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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Low‐Temperature Sintering and Microwave Dielectric Properties of (Mg_0.95Zn_0.05)₂(Ti_0.8Sn_0.2)O₄–(Ca_0.8Sr_0.2)TiO₃ Composite Ceramics