Effect of small amount of cobalt substitution on structure and microwave dielectric properties of barium magnesium niobate ceramics

Chen, Ching‐Tien; Huang, Chien‐Yi; Hong, Lin; Lee, Chun Te

doi:10.1016/j.jeurceramsoc.2012.03.025

Cited by 7 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7 By substituting Co 2+ for Zn 2+ to form Ba([Zn 1Àx Co x ] 1/3 Nb 2/3 )O 3 solid solution, the Q value can be obviously improved, and s f can be tuned to near-zero. 23,24 In the previous work, 23,24 although some improvement in Q 9 f value was reported, the Q 9 f value in the entire composition range was not high (less than 40,000 GHz). 18 Many investigations have been carried out to further improve the Q 9 f value and lower the sintering temperature.…”

Section: Introductionmentioning

confidence: 81%

“…The Co 2+ substitution for Mg 2+ was reported to tune the s f to near-zero. 23,24 In the previous work, 23,24 although some improvement in Q 9 f value was reported, the Q 9 f value in the entire composition range was not high (less than 40,000 GHz). Therefore, the improvement of Q 9 f value in the Co substituted Ba(Mg 1/3 Nb 2/3 )O 3 ceramics through microstructures optimization is an important issue.…”

Section: Introductionmentioning

confidence: 81%

See 1 more Smart Citation

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg_1−xCo_x]_1/3Nb_2/3)O₃ Ceramics

Sun

Mao

et al. 2013

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Effects of postdensification annealing on microwave dielectric properties of Ba([Mg1−xCox]1/3Nb2/3)O3 ceramics have been investigated. The 1:2 ordered complex perovskite structure is obtained in the entire composition range of the as‐sintered samples, and the ordering degree decreases with increasing x. With increasing x, the dielectric constant (εr) increases, the temperature coefficient of resonant frequency (τf) shifts toward negative and can be tuned to near‐zero for x = 0.6, while the Q × f value decreases. With postdensification annealing at 1400°C in air for 24 h, the ordering degree increases, and Q × f value can be significantly improved without obvious change in εr, while the composition for obtaining near‐zero τf shifts to x = 0.8. Annealing at 1375°C and 1425°C in air for 24 h does not improve microwave dielectric properties more than annealing at 1400°C. A good combination of microwave dielectric properties of Ba([Mg1−xCox]1/3Nb2/3)O3 ceramics after postdensification annealing at 1400°C in air for 24 h has been obtained for x = 0.8: εr = 31.7, Q × f = 76,900 GHz, τf = 3.3 ppm/°C.

show abstract

Section: Introductionmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 81%

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg_1−xCo_x]_1/3Nb_2/3)O₃ Ceramics

Sun

Mao

et al. 2013

Int J Applied Ceramic Tech

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

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

et al. 2021

View full text Add to dashboard Cite

The explosive process of 5G communication evokes the urgent demand of miniaturized and integrated dielectric ceramics filter. It is a pressing need to advance the development of dielectric ceramics utilization of emerging technology to design new materials and understand the polarization mechanism. This review provides the summary of the study of microwave dielectric ceramics (MWDCs) sintered higher than 1000 from 2010 up to now, °C with the purpose of taking a broad and historical view of these ceramics and illustrating research directions. To date, researchers endeavor to explain the structure-property relationship of ceramics with multitude of approaches and design a new formula or strategy to obtain excellent microwave dielectric properties. There are variety of factors that impact the permittivity, dielectric loss, and temperature stability of dielectric materials, covering intrinsic and extrinsic factors. Many of these factors are often intertwined, which can complicate new dielectric material discovery and the mechanism investigation. Because of the various ceramics systems, pseudo phase diagram was used to classify the dielectric materials based on the composition. In this review, the ceramics were firstly divided into ternary systems, and then brief description of the experimental probes and complementary theoretical methods that have been used to discern the intrinsic polarization mechanisms and the origin of intrinsic loss was mentioned. Finally, some perspectives on the future outlook for high-temperature MWDCs were offered based on the synthesis method, characterization techniques, and significant theory developments.

show abstract

Effect of small amount of cobalt substitution on structure and microwave dielectric properties of barium magnesium niobate ceramics

Cited by 7 publications

References 12 publications

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg_1−xCo_x]_1/3Nb_2/3)O₃ Ceramics

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg_1−xCo_x]_1/3Nb_2/3)O₃ Ceramics

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Contact Info

Product

Resources

About

Effect of small amount of cobalt substitution on structure and microwave dielectric properties of barium magnesium niobate ceramics

Cited by 7 publications

References 12 publications

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg1−xCox]1/3Nb2/3)O3 Ceramics

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg1−xCox]1/3Nb2/3)O3 Ceramics

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

The latest process and challenges of microwave dielectric ceramics based on pseudo phase diagrams

Contact Info

Product

Resources

About

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg_1−xCo_x]_1/3Nb_2/3)O₃ Ceramics

Effects of Postdensification Annealing on Microwave Dielectric Properties of Ba([Mg_1−xCo_x]_1/3Nb_2/3)O₃ Ceramics