Low-losses, highly tunable Ba0.6Sr0.4TiO3∕MgO composite

Chung, U‐Chan; Elissalde, Catherine; Maglione, Mario; Estournès, Claude; Paté, M.; Ganne, Jean‐Pierre

doi:10.1063/1.2837621

Cited by 139 publications

(57 citation statements)

References 22 publications

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“…In addition, using standard sintering there is only a restricted control of the materials chemistry: oxygen deficiency, intrinsic charged defects, valence state. We overcomed these drawbacks using SPS to process highly densified BST/MgO ceramics with different design (multilayer 49 and 3D random mixing 50 ). Whatever the connectivity between the two phases and thus increasing the number of interfaces, chemically sharp interfaces are obtained (Fig.…”

Section: Multimaterials At the Microscalementioning

confidence: 99%

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Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

et al. 2015

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Breakthroughs can be expected in multi-component ceramics by adjusting the phase assembly and the micro-nanostructure. Controlling the architecture of multi-materials at different scales is still challenging and provides a great opportunity to broaden the range of functionalities in the field of ferroelectric-based ceramics. We used the potentialities of Spark Plasma Sintering (SPS) to control a number of key parameters regarding the properties: anisotropy, interfaces, grain size and strain effects. The flexibility of the wet and supercritical chemistry routes associated with the versatility of SPS allowed designing new ferroelectric composite ceramics at different scales. These approaches are illustrated through various examples based on our work on ferroelectric/dielectric composites.

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Section: Multimaterials At the Microscalementioning

confidence: 99%

“…5(b)). 49,50 A dual synthesis route was proposed to control simultaneously the extrinsic and intrinsic dielectric losses of barium strontium titanate. The goal is to broaden the frequency range application of these materials by an efficient use of their tunability.…”

Section: Multimaterials At the Microscalementioning

confidence: 99%

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

et al. 2015

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“…Indeed, it is well known that SPS allows the formation of well-densified ceramics without an excessive grain growth of the starting nanomaterial and limits interdiffusions in the case of materials association. [29][30][31][32] For example, nanoceramics of various metal oxide materials such as Al 2 O 3 , [33] MgO, [34] TiO 2 , [35,36] BaTiO 3 , [36] ZrO 2 , [37] SiAlON, [38] hydroxy-apatites, [39] Y 2 O 3 , [40] and ZnO [41] have been successfully prepared by this method. In the case of zinc oxide, no nanostructured varistor ceramic has been described, mainly because the reported works are either focused on other applications, [41] or the final material is not nanometer-scaled.…”

Section: Nanoparticles For Varistor Elaboration and Sps For Nanostrucmentioning

confidence: 99%

Size Effect on Properties of Varistors Made From Zinc Oxide Nanoparticles Through Low Temperature Spark Plasma Sintering

Macary

Kahn

Estournès

et al. 2009

Adv Funct Materials

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Conditions for the elaboration of nanostructured varistors by spark plasma sintering (SPS) are investigated, using 8‐nm zinc oxide nanoparticles synthesized following an organometallic approach. A binary system constituted of zinc oxide and bismuth oxide nanoparticles is used for this purpose. It is synthesized at room temperature in an organic solution through the hydrolysis of dicyclohexylzinc and bismuth acetate precursors. Sintering of this material is performed by SPS at various temperatures and dwell times. The determination of the microstructure and the chemical composition of the as‐prepared ceramics are based on scanning electron microscopy and X‐ray diffraction analysis. The nonlinear electrical characteristics are evidenced by current–voltage measurements. The breakdown voltage of these nanostructured varistors strongly depends on grain sizes. The results show that nanostructured varistors are obtained by SPS at sintering temperatures ranging from 550 to 600 °C.

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“…Two of them used commonly are: (1) adding nonferroelectric materials such as MgO, MgTiO 3 , Mg 2 SiO 4 and CeO 2 [15][16][17][18][19][20]; (2) doping with different ions such as Mn 4? , Fe 3?…”

Section: Introductionmentioning

confidence: 99%

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

Qiu

et al. 2015

J Mater Sci: Mater Electron

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0.55Ba x Sr 1-x TiO 3 -0.45MgO composite ceramics (BST-MgO, x = 0.5-0.65) co-modified with CuO and MnO 2 were prepared by conventional soild state reaction method. The microstructure, phase and morphology were investigated. The results showed the formation of the perovskite BST phase and MgO phase. The dielectric constant (e r ) and tunability (T) of the ceramic samples increased with increasing Ba content. The dielectric loss (tan d) and figure of merit achieved their minimum and maximum at x = 0.6, respectively. The obtained ceramic sample with x = 0.6 exhibited favorable properties, which are listed as follows: e r = 190, tan d = 0.22 %, T = 16 %, E c = 5.6 kV/cm and FOM = 72.7.

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Low-losses, highly tunable Ba0.6Sr0.4TiO3∕MgO composite

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 139 publications

References 22 publications

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

Innovative architectures in ferroelectric multi-materials: Chemistry, interfaces and strain

Size Effect on Properties of Varistors Made From Zinc Oxide Nanoparticles Through Low Temperature Spark Plasma Sintering

Enhanced dielectric tunability of Ba x Sr1−x TiO3–MgO composite ceramics co-modified with CuO and MnO2

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