Low-temperature sintering and microwave dielectric characteristics of Ba2Ti9O20 ceramics

Lee, Junga; Lee, Joon‐Hyung; Kim, Jeong-Joo

doi:10.1016/j.jeurceramsoc.2005.09.066

Cited by 12 publications

(2 citation statements)

References 5 publications

(2 reference statements)

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“…With recent progress in microwave telecommunication industries, the miniaturization of dielectric devices such as band pass filters, duplexers and resonators has been a major requirement for volume efficiency. For the fabrication of miniaturized devices, multilayer co-firing process became an indispensable technology [1][2][3]. Cubic bismuth zinc niobate (Bi 1.5 ZnNb 1.5 O 7 ) pyrochlore ceramics exhibit high permittivity(170),relatively low dielectric loss (10 −4 ), compositionally adjustable temperature coefficients of capacitance (TCC),and lower firing temperature (below1100℃).…”

Section: Introductionmentioning

confidence: 99%

Effect of H3BO3 Coating on the Microwave Dielectric Properties of BZN Ceramics

Liu

Jin

Wang

2014

AMR

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(Bi1.5Zn0.5)(Zn0.5Nb1.5)O7(BZN) ceramic samples were prepared by solid state reaction. B2O3 was introduced by liquid coating technology with H3BO3 solution in the BZN ceramic specimen to reduce its sintering temperature. The sintering behavior, phase composition and dielectric properties of ceramics were investigated by X-ray diffraction, scanning electron microscopy and vector network analyzer. The (Bi1.5Zn0.5)(Zn0.5Nb1.5)O7 ceramic composite could be sintered well at 900°C for 3h when 0.9M/l H3BO3 was added and showed good dielectric properties of εr=150,Q×f=228,τf=-362ppm/°C.

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Section: Introductionmentioning

confidence: 99%

Effect of H3BO3 Coating on the Microwave Dielectric Properties of BZN Ceramics

Liu

Jin

Wang

2014

AMR

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“…However, during the sintering treatment, reactions between the glass and ceramics may induce compositional changes and/or development of second phases due to local heterogeneities, 978-1-4799-1397-8/13/$31.00 ©2013 IEEE which may deteriorate the microwave dielectric properties [1][2][3][4]. To minimize these drawbacks several preparation methods have been used [4][5][6][7][8][9][10]. In this study a new approach for obtaining B20radded BTO nanopowder is considered by using a hybrid chemical and co-precipitation method.…”

Section: Introductionmentioning

confidence: 99%

Barium nanotitanate microwave ceramics obtained by a chemical method

Castro

Zanetti

2013

2013 SBMO/IEEE MTT-S International Microwave &Amp; Optoelectronics Conference (IMOC)

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Dielectric resonators with high dielectric constant, low dielectric losses and high frequency stability have been widely used in microwave circuits for telecommunications as filters, oscillators, antennas. Among the compounds of the BaO Ti02 system, Ba2 Ti9020 has met these requirements. However, such materials are difficult to obtain by conventional mechanical powder mixture due to the preferential formation of secondary phases and high sintering temperatures around 1300°C. In this investigation a new approach for obtaining B20radded Ba2 Ti9020 is considered through a chemical method involving a co-precipitation process aiming to reduce the sintering temperature and to promote a high microstructural homogeneity of the compound. Therefore, cylindrical ceramics were sintered at 1000-1150°C presenting values of electric permittivity from 34.8 to 41.4, quality factor due to dielectric losses from 2945 to 3525, temperature coefficient from 6.2 to 10.2 ppm/DC and an overall tunable frequency range of 5.00-7.00 GHz, which yields promising properties for use as dielectric resonators.

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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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Low-temperature sintering and microwave dielectric characteristics of Ba2Ti9O20 ceramics

Cited by 12 publications

References 5 publications

Effect of H<sub>3</sub>BO<sub>3</sub> Coating on the Microwave Dielectric Properties of BZN Ceramics

Effect of H<sub>3</sub>BO<sub>3</sub> Coating on the Microwave Dielectric Properties of BZN Ceramics

Barium nanotitanate microwave ceramics obtained by a chemical method

List of Low‐Loss Ceramic Dielectric Materials and Their Properties

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