Structure–dielectric properties relationship in Mg–Mn co-doped Ba0.4Sr0.6TiO3/MgAl2O4tunable microwave composite ceramics

Zhang, Jingji; Zhai, Jiwei; Zhang, Mingwei; Qi, Peng; Yu, Xian Jin; Yao, Xi

doi:10.1088/0022-3727/42/7/075414

Cited by 20 publications

(6 citation statements)

References 29 publications

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“…T C of BST has been observed frst elevated which was then lowered when codoped with 2.0 wt % Mg as well as 2.0 wt % Mn through a solid-state reaction method. According to Zhang et al, this was due to the lowering of the internal stress and microstructural change from cubic to hexagonal [120].…”

Section: Efect Of Unidoping and Codoping On Dielectric Property Of Bs...mentioning

confidence: 99%

Multielement Doped Barium Strontium Titanate Nanomaterials as Capacitors

Balachandran

Kelele

Murthy

et al. 2023

Journal of Chemistry

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Due to the growing demand of energy and wastage of energy, there exists an interest of storing energy so that it could be utilized efficiently. Capacitors are materials designed for such an application. Ferroelectric materials are known for their application as capacitors. Of such materials, perovskites are the preferable classes of materials that have been used as capacitors. Barium strontium titanate nanomaterial is a member of perovskites which encompasses a smaller dielectric loss, elevated dielectric constant, and good thermal stability. Research studies also clarified that incorporating dopants into a barium strontium titanate nanomaterial of high dielectric materials including metal/metal oxides enhances their efficiency and effectiveness. Moreover, multielement doping or codoping has shown better dielectric properties as compared to the unidoping of BST. In this review, barium strontium titanate capacitors codoped with more than one metal/metal oxides have been studied most of which have shown that the codoped barium strontium titanate materials possess improved and sufficient dielectric properties to be utilized as capacitors. We believe that this work will have of its own contribution on understanding the doped barium strontium titanate nanomaterial by clarifying the most probable and detail reasons behind the enhancement of dielectric properties of codoped barium strontium titanate nanomaterials.

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Section: Efect Of Unidoping and Codoping On Dielectric Property Of Bs...mentioning

confidence: 99%

Multielement Doped Barium Strontium Titanate Nanomaterials as Capacitors

Balachandran

Kelele

Murthy

et al. 2023

Journal of Chemistry

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“…However, all these characteristics are hardly met in standard materials mainly because the reduction of losses requires a smearing out of the ferroelectric behavior, which in turn alters the dielectric tunability . To comply with this intrinsic contradiction and to improve the overall behavior of ferroelectric ceramics, two complementary routes have been used till now: (i) the composite one, based on the mixing between a ferroelectric Ba 1− x Sr x TiO 3 (BST) phase and a low losses dielectric material like MgO; (ii) the chemical one, with the substitution on the ferroelectric active Ti site of BST by cations like Mn . Although a wealth of composites and substitutions have been attempted during the past 15 yrs, the property control toward the optimization of the relative contribution of both routes has not yet been achieved.…”

Section: Introductionmentioning

confidence: 99%

Stoichiometry and Grain Boundaries Control by Spark Plasma Sintering in Ba_0.6Sr_0.4TiO₃:Mn/MgO Composites

et al. 2012

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This study highlights the possibility to control materials' chemistry simultaneously at the atomic and micrometric scales and to design functional oxide-based multimaterials, thanks to the specificity of Spark Plasma Sintering (SPS). We have used a dual synthesis route, namely chemical and composite, combined with SPS to adjust the oxidation state of intrinsic and dopant ions, the grain boundaries state, and to control interdiffusion in composites made of Mn-doped Ba 0.6 Sr 0.4 TiO 3 (BST) and MgO. At the atomic level, the Mn substituent valence state can be fixed according to the sintering process: Electron Paramagnetic Resonance evidenced Mn 2þ Ti , Mn 4þ Ti , and Mn 2þ Ti -V O charged defects. We established a link between the nature of the charged defects and the high-frequency dielectric losses. At the microscopic level, control of the grain size, the grain boundaries, and the interdiffusion between the components is achievable using SPS. The composite effect acts at low frequency by efficiently decreasing the extrinsic losses arising from the grain boundaries contribution and by increasing the thermal stability of the permittivity. Such an approach based on SPS, chemical and composite routes, has allowed designing BST-based composites operating in a wide frequency range (kHz-GHz) with low dielectric losses and high electric field tunability.C. Randall-contributing editor Manuscript No. 30475.

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“…Usually, the resonance frequencies of metamaterials are affected by several factors, such as size of elements and permittivity and permeability of substrates. Dielectric constant of ferroelectric ceramics is variable with temperature, electric field, and stress . Recently, ferroelectric ceramics have also been used to construct metamaterials .…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of Ba_0.7Sr_0.3TiO₃ Film at Terahertz Measured by Metamaterials

Fan

et al. 2012

J. Am. Ceram. Soc.

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A metamaterial device with resonance frequency at THz was reported in this article. The device was composed of split-ring resonators (SRR), ferroelectric Ba 0.7 Sr 0.3 TiO 3 (BST70) film, and alumina substrates. The SRR of 140 nm thick Au/Ti was fabricated on BST70 film with periodicity of 50 lm, width of 10 lm, and gap of 8 lm. The BST70 thin film was deposited on alumina substrates using a sol-gel technique. Terahertz time domain spectroscopy was used to characterize electromagnetic response of the metamaterial at various temperatures. Finite difference time domain was used to simulate the transmission spectra of the metamaterial at THz frequencies. Dielectric constant of the BST70 film at THz, in the temperature range from 0°C to 100°C, was derived by comparing the simulated resonance frequency with the experimental curves.

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Structure–dielectric properties relationship in Mg–Mn co-doped Ba_0.4Sr_0.6TiO₃/MgAl₂O₄tunable microwave composite ceramics

Cited by 20 publications

References 29 publications

Multielement Doped Barium Strontium Titanate Nanomaterials as Capacitors

Multielement Doped Barium Strontium Titanate Nanomaterials as Capacitors

Stoichiometry and Grain Boundaries Control by Spark Plasma Sintering in Ba_0.6Sr_0.4TiO₃:Mn/MgO Composites

Dielectric Properties of Ba_0.7Sr_0.3TiO₃ Film at Terahertz Measured by Metamaterials

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Structure–dielectric properties relationship in Mg–Mn co-doped Ba0.4Sr0.6TiO3/MgAl2O4tunable microwave composite ceramics

Cited by 20 publications

References 29 publications

Multielement Doped Barium Strontium Titanate Nanomaterials as Capacitors

Multielement Doped Barium Strontium Titanate Nanomaterials as Capacitors

Stoichiometry and Grain Boundaries Control by Spark Plasma Sintering in Ba0.6Sr0.4TiO3:Mn/MgO Composites

Dielectric Properties of Ba0.7Sr0.3TiO3 Film at Terahertz Measured by Metamaterials

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Structure–dielectric properties relationship in Mg–Mn co-doped Ba_0.4Sr_0.6TiO₃/MgAl₂O₄tunable microwave composite ceramics

Stoichiometry and Grain Boundaries Control by Spark Plasma Sintering in Ba_0.6Sr_0.4TiO₃:Mn/MgO Composites

Dielectric Properties of Ba_0.7Sr_0.3TiO₃ Film at Terahertz Measured by Metamaterials