Investigation of BZT thin films for tunable microwave applications

Xu, Jing-Ping; Menesklou, Wolfgang; Ivers-Tiffée, Ellen

doi:10.1016/j.jeurceramsoc.2005.03.048

Cited by 22 publications

(9 citation statements)

References 13 publications

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“…As Zr 4þ (0.087 nm) is more chemically stable than Ti 4þ (0.068 nm), the addition of Zr in BST can also improve the chemical stability and reduce the dielectric loss. 6,7 The substitution of Ti with Zr would depress the conduction by electronic hopping between Ti 4þ and Ti 3þ ion which maintains a low leakage current. The structural, dielectric, and ferroelectric properties of Ba(Zr, Ti)O 3 (BZT) ceramics, showing strong dependence on the Zr content, have been reported in the literatures.…”

Section: Introductionmentioning

confidence: 99%

The structural and in-plane dielectric/ferroelectric properties of the epitaxial (Ba, Sr)(Zr, Ti)O3 thin films

Chan¹,

Wang²,

Wang³

et al. 2014

Journal of Applied Physics

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Epitaxial (Ba 1-x Sr x)(Zr 0.1 Ti 0.9)O 3 (BSZT, x ¼ 0-0.45) thin films were deposited on (LaAlO 3) 0.3 (Sr 2 AlTaO 6) 0.35 (LSAT) substrates by pulsed laser deposition. The experimental results demonstrate that the structural, dielectric, and ferroelectric properties of the BSZT thin films were greatly dependent on the strontium content. The BSZT thin films transformed from tetragonal to cubic phase when x ! 0.35 at room temperature. The Curie temperature and room-temperature remnant polarization decrease with increasing strontium concentration. The optimal dielectric properties were found in (Ba 0.55 Sr 0.45)(Zr 0.1 Ti 0.9)O 3 thin films which is in paraelectric state, having tunability of 47% and loss tangent of 0.0338 under an electric field of 20 MV/m at 1 MHz. This suggests that BSZT thin film is a promising candidate for tunable microwave device applications.

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Section: Introductionmentioning

confidence: 99%

The structural and in-plane dielectric/ferroelectric properties of the epitaxial (Ba, Sr)(Zr, Ti)O3 thin films

Chan¹,

Wang²,

Wang³

et al. 2014

Journal of Applied Physics

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“…The ferroelectric material Barium-Strontium-Titanate (BST) is one of the most promising candidates in the frequency range up to 15 GHz (Tagantsev et al 2003). Other tunable materials such as potassium-tantalate-niobate (KTN) (Laur et al 2005), silver-tantalate-niobate (ATN) (Zimmermann et al 2004a), barium-zirconate-titanate (BZT) (Xu et al 2005;Zimmermann et al 2004b), and bismuth-zinc-niobate (BZN) (Park et al 2005) can be used up to a few Megahertz only. Liquid crystals show very good performance above 10 GHz (Müller et al 2007;Karabey et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear ceramics for tunable microwave devices

et al. 2011

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The research on materials and systems for tunable microwave devices has gained attraction within the last years. The radio frequency characterization and the component design of tunable microwave components based on dielectric ceramics especially barium-strontium-titanate (BST) are presented in this second part, whereas the basic material properties are discussed in detail in the first part. After a short introduction to the processing technology used for the fabrication of tunable components based on a BST thick film, the relations between microwave properties and material properties as well as the microstructure are presented in detail. The design process for tunable microwave components based on BST thick films is described. Especially the considerations related to micro-and macrostructure and their connection are highlighted. The paper closes with two different application examples: a reconfigurable array antenna for satellite communication and varactors for high power applications.

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“…In order to reduce the dielectric loss at low frequencies, ZrO 2 was used as a dopant. Barium zirconate titanate Ba(Zr x Ti 1−x )O 3 , BZT has attracted great attention for its potential applications for microwave technology [16], due to its high dielectric constant, low dielectric loss, and large tunability [17], because the Zr 4+ ion (0.087 nm) is chemically more stable than the Ti 4+ (0.068 nm) and has a larger ionic size to expand the lattice [18]. Recently, the literature have reported on the effect of the substitution of Ti 4+ by Sn 4+ ions in the(Ba,Sr)TiO 3 lattice [19,20].…”

Section: Introductionmentioning

confidence: 99%