Investigation of barium strontium titanate thick films for tunable phase shifters

Zimmermann, F.; Voigts, M.; Weil, C.; Jakoby, Rolf; Wang, P; Menesklou, Wolfgang; Ivers-Tiffée, Ellen

doi:10.1016/s0955-2219(01)00164-9

Cited by 118 publications

(61 citation statements)

References 6 publications

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“…An X-ray diffraction examination of the products indicated that they consist mainly of a Ba 0. 6 formed by adding 1 mass % B 2 O 3 and sintering at 1000°C in air for 2 h gives a maximum permittivity, ¾ max = 1826, and a bulk density >95% of theoretical. Moreover, BSTC with 0.5 mass % B 2 O 3 addition sintered at 1000°C exhibits a maximum permittivity, ¾ max = 2100, and a bulk density >92% of theoretical density.…”

Section: Discussionmentioning

confidence: 99%

Effect of B2O3 addition on dielectric properties and microstructure of Ba0.6Sr0.4TiO3-CuO ceramics

Lee

Teoh

Yeh

et al. 2010

J. Ceram. Soc. Japan

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This study investigates the effect of B 2 O 3 on the sintering behaviour, dielectric properties and microstructure of Ba 0.6 Sr 0.4 TiO 3 + 0.6% CuO (BSTC) ceramics. Ceramics were sintered in air at temperatures ranging from 900 to 1150°C. There are two kinds of secondary phases produced in BSTC ceramics during B 2 O 3 addition; one is BaCuB 2 O 5 with a melting point of approximately 850°C, and the other is BaTi(BO 3 ) 2 with a melting point of ³749°C. The amount of secondary phase present was seen to increase as the amount of B 2 O 3 additives increased. The BSTC ceramics with 1 mass % B 2 O 3 sintered at 1000°C in air for 2 hours exhibited a maximum permittivity, ¾ max = 1826, and a bulk density >95% of theoretical density. Moreover, 0.5 mass % B 2 O 3 doped BSTC sintered at 1000°C exhibits a maximum permittivity, ¾ max = 2100, and a bulk density >92% of theoretical density.

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Section: Discussionmentioning

confidence: 99%

Effect of B2O3 addition on dielectric properties and microstructure of Ba0.6Sr0.4TiO3-CuO ceramics

Lee

Teoh

Yeh

et al. 2010

J. Ceram. Soc. Japan

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“…In this work, attempts have been made to prepare polymer-Barium Titanate composites and their dielectric properties are studied for determining similarity for a variety of dielectric applications, such as in dielectric capacitors 13 , transducers 14 and tunable phase shifters 15 .…”

Section: Introductionmentioning

confidence: 99%

Dielectric Behavior of Nano Barium Titanate Filled Polymeric Composites

Pratap

Joshi²,

Rakshit³

et al. 2013

Int. J. Mod. Phys. Conf. Ser.

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Rapid growth of electronic industry requires development of new materials that combine the high dielectric constant intrinsic to ferroelectric ceramic materials with easy processing characteristics of polymers. Ceramic-polymeric composites possess interesting properties for a variety of electronic applications including passive electronic devices. In fact, polymer-ceramic materials have drawn lot attention for use in microelectronic packaging, because they can give higher performance with lower cost, size and weight. In this work, attempts are made to prepare ceramic polymer composites followed by characterization of dielectric properties. The Barium Titanate ceramic powders are synthesized using the hydrothermal process. Crystal structure and crystallite size of particles are determined using X-ray diffraction. Silane treatment is carried out on Barium Titanate powder to increase its compatibility with polymer, followed with preparation of ceramic polymer composites. Epoxy and polyvinyledene fluoride (PVDF) polymers are used as matrices for preparation of the composites. The proportion of nanopowder is varied from 60 to 90 wt%. Dielectric properties such as volume resistivity, dielectric constant, dissipation factor are evaluated. Results indicate that the dielectric constant and dissipation factor vary between 18 -140 and 0.01 to 0.09, respectively as the relative ratio of polymer and silane modified Barium Titanate is varied. Specifically, at 90 wt% of 0.1 wt% silane modified Barium Titanate, the highest dielectric constant of 140 along with dissipation factor of 0.07 is obtained in the epoxy based system.

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“…The high permittivity of BST bulk ceramics can be reduced for thick films by adjusting the microstructure (e.g. small grain size and high porosity) or for thin films by prevailing mechanical stresses between the substrate and the BST thin film (Zimmermann et al 2001). Numerous studies focused on the improvement of BST.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ceramics for tunable microwave devices part I: materials properties and processing

et al. 2011

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Nonlinear dielectrics are promising materials for tunable microwave components. However, dielectric loss, tunability, and temperature dependence of such dielectrics are crucial parameters and have to be optimized for an application as microwave device. In part I of this split publication, the impact of doping and processing on the material performance of Ba 0.6 Sr 0.4 TiO 3 (BST) ceramics and thick films are presented. A phenomenological model developed by Vendik (Vendik and Zubko 2000) was used to characterize the influence of doping on the material performance of BST as tunable microwave dielectrics. It is shown that acceptor (iron, Fe)-donor (fluoride, F) codoping can positively influence the tunability of BST fundamentally. This impact is interpreted by charged defects influenced by doping and/or related defect formations. In addition to doping, it is shown that thermal treatment of powders and thick films as well as the deposition method show a strong impact on dielectric performance of the final thick-films. In the following part II, metallization, component design, and RF-characterization of tunable microwave devices will be discussed.

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Investigation of barium strontium titanate thick films for tunable phase shifters

Cited by 118 publications

References 6 publications

Effect of B2O3 addition on dielectric properties and microstructure of Ba0.6Sr0.4TiO3-CuO ceramics

Effect of B2O3 addition on dielectric properties and microstructure of Ba0.6Sr0.4TiO3-CuO ceramics

Dielectric Behavior of Nano Barium Titanate Filled Polymeric Composites

Nonlinear ceramics for tunable microwave devices part I: materials properties and processing

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