(5−x)BaO–xMgO–2Nb2O5 ceramics prepared using a reaction-sintering process

Liou, Yi-Cheng; Shih, Chung-Yu; Shiu, Wen-Hau

doi:10.1016/j.materresbull.2006.09.009

Cited by 5 publications

(1 citation statement)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Lee et al 12) found that substituting strontium for barium in Ba 5 Nb 4 O 15 caused a symmetry change from P P3m1 to P P3c1, which influenced the variation of " r and f . Liou et al 13) also found that the substituting Mg for Ba could improve the dielectric properties of Ba 5 Nb 4 O 15 ceramics prepared by reaction sintering. Ti and La substitution for Nb and Ba was also investigated by De Paoli et al 11) as Ba 5Àx La x Nb 4Àx Ti x O 15 , but the microwave dielectric properties of the material were not investigated.…”

Section: Introductionmentioning

confidence: 97%

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba₅Nb₄O₁₅ Ceramics

Zhuang

Yue

Zhao

et al. 2008

jjap

View full text Add to dashboard Cite

W,Ti co-doped Ba 5 Nb 4 O 15 microwave dielectric ceramics with compositions of Ba 5 Nb 4Àx (W 1=2 Ti 1=2 ) x O 15 (x ¼ 0 { 2) were prepared by solid-state reaction method. W 6þ and Ti 4þ substitution for Nb 5þ can markedly lower the sintering temperature of Ba 5 Nb 4 O 15 from 1450 to 1250 C. X-ray powder diffraction (XRD) analysis reveals that BaWO 4 formed as a secondary phase due to the limited solubility of WO 3 in perovskite Ba 5 Nb 4 O 15 when x > 0:4. Scanning electron microscopy (SEM) observation suggests that a small amount of W and Ti co-doping can suppress the grain growth of Ba 5 Nb 4 O 15 ceramics, indicating that the grain size decreases from $25 to $3 mm. The microwave dielectric properties of Ba 5 Nb 4 O 15 ceramics is largely improved by W,Ti co-doping. With increasing x, the Q Â f value increases from 25,200 GHz for undoped samples (x ¼ 0) to 38,600 GHz for x ¼ 0:4, and then declines to 19,500 GHz for x ¼ 1:2. In the composition range x ¼ 0 {1:2, the dielectric constant increases slightly from 39.2 to 44, while the temperature coefficient decreases from $78 to $50 ppm/ C. The reasons for the improvement of the dielectric properties were investigated by SEM, XRD, and AC impedance spectrum analysis.

show abstract

Section: Introductionmentioning

confidence: 97%

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba₅Nb₄O₁₅ Ceramics

Zhuang

Yue

Zhao

et al. 2008

jjap

View full text Add to dashboard Cite

show abstract

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

2017

Microwave Materials and Applications 2V Set

View full text Add to dashboard Cite

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.

show abstract

Microstructure and microwave dielectric properties of Ba(Mg1/3Nb2/3)O3–MgO composite ceramics with nano-silica added

Yang

Jin

et al. 2022

J Mater Sci: Mater Electron

View full text Add to dashboard Cite

(5−x)BaO–xMgO–2Nb2O5 ceramics prepared using a reaction-sintering process

Cited by 5 publications

References 16 publications

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba₅Nb₄O₁₅ Ceramics

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba₅Nb₄O₁₅ Ceramics

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

Microstructure and microwave dielectric properties of Ba(Mg1/3Nb2/3)O3–MgO composite ceramics with nano-silica added

Contact Info

Product

Resources

About

(5−x)BaO–xMgO–2Nb2O5 ceramics prepared using a reaction-sintering process

Cited by 5 publications

References 16 publications

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba5Nb4O15 Ceramics

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba5Nb4O15 Ceramics

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

Microstructure and microwave dielectric properties of Ba(Mg1/3Nb2/3)O3–MgO composite ceramics with nano-silica added

Contact Info

Product

Resources

About

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba₅Nb₄O₁₅ Ceramics

Effects of W,Ti Co-Doping on the Microstructure and Microwave Dielectric Properties of Ba₅Nb₄O₁₅ Ceramics