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Dielectric tunable characteristics of compositional-gradient BaTi_(1-x)Sn_(x)O_(3)thin films

Journal of Advanced Dielectrics 2021年第4期11卷 46-55页

作者： Chenjing Wu Manwen Yao Functional Materials Research Laboratory School of Materials Science&Engineering Tongji University No.4800 Cao’an Road Shanghai 201804P.R.China

Compositional-gradient BaTi_(1-x)Sn_(x)O_(3)thin films on Pt(100)/Ti/SiO_(2)/Si substrates are fabricated with sol-gel using spin *** of the structures of the prepared thin films are of single-phase crystalline perovskite with a dense and crack-free surface ***10/15/20 thin film exhibits enhanced temperature stability in its dielectric *** temperature coefficient of capacitance TCC_(20-150)in the temperature range from 20°C to 150°C is−0.9×10^(−4)/°C and that of TCC20-(-95)in the temperature range from 20°C to−95°C is−3.8×10^(−4)/°***,the thin films show low leakage current density and dielectric *** and stable dielectric tunable performances are found in BTS10/15/20 thin films:the dielectric tunability of the thin films is around 20.1%under a bias voltage of 8 V at 1 MHz and the corresponding dielectric constant is in the range between 89 and 111,which is beneficial for impedance matching in *** tunability can be obtained under a low tuning voltage,which helps ensure *** simulated resonant frequency of the compositional-gradient BTS thin films depends on the bias electric field,showing compositional-gradient BTS thin films could be used in electrically tunable components and *** prop-erties make compositional-gradient BTS thin films a promising candidate for dielectric tuning.

关键词： barium stannate titanate compositional-gradient thin films dielectric tunable performance temperature stability

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Jonscher indices for dielectric materials

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Journal of Advanced Dielectrics 2019年第6期9卷 31-35页

作者： C.L.Wang School of Physics Shandong University Jinan 250100P.R.China

Two parameters are proposed as Jonscher indices,named after *** for his pioneering contribution to the universal dielectric relaxation *** domain universal dielectric relaxation law is then obtained from the asymptotic behavior of dielectric response function and relaxation function by replacing parameters in Mittag–Leffler functions with Jonscher *** types can be easily determined from experimental data of discharge current in barium stannate titanate after their Jonscher indices are determined.

关键词： Jonscher indices universal dielectric relaxation law barium stannate titanate

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RELAXOR FERROELECTRIC MATERIALS FOR MICROWAVE TUNABLE APPLICATIONS

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Journal of Advanced Dielectrics 2012年第1期2卷 19-33页

作者： QIWEI ZHANG JIWEI ZHAI LING BING KONG Functional Materials Research Laboratory Tongji University Siping Road 1239Shanghai 200092P.R.China Temasek Laboratories National University of Singapore 5A Engineering Drive 1Singapore 117411Singapore

With strong dependences of dielectric constant on external applied electric fields,relaxor barium zirconium titanate(BaZr_(x)Ti_(1-x)O_(3)or BZT)and barium stannate titanate(BaS_(n)xTi_(1-x)O_(3)or BTS),in both bulk ceramic and thinfilm forms,are increasingly being recognized as potential candidates of microwave tunable materials for device *** paper is aimed to review the recent progress in understanding the dielectric properties(such as tunability,dielectric loss and dielectric constant)of these relaxor ***,due to their relatively high dielectric constant and loss tangent,pure Ba(Zr,Ti)O_(3) and Ba(Sn,Ti)O_(3) do not fully satisfy the requirements of practical device ***,various strategies have been developed to improve the dielectric properties of these two groups of relaxor *** this paper,wefirst discussed the dielectric tunability characteristics of pure Ba(Zr,Ti)O_(3) and Ba(Sn,Ti)O_(3) and then summarized the strategies that have been used,including(i)small amount acceptor or donor doping(such as rare-earth ions and transition metal ions)and(ii)forming composites with low loss and low dielectric constant microwave dielectric materials(such as MgO,MgTiO_(3) and so on).At the same time,the relationship between relaxor behavior and dielectric tunability was also discussed.

关键词： Relaxor materials barium zirconium titanate barium stannate titanate dielectric tunability ferroelectric composites

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