Dielectric and piezoelectric behaviors of NBT-BT0.05 processed by sol–gel method

Cernea, Marin; Vasile, Bogdan Ștefan; Capiani, Claudio; Ioncea, A.; Galassi, Carmen

doi:10.1016/j.jeurceramsoc.2011.07.038

Cited by 45 publications

(14 citation statements)

References 31 publications

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“…The mixing of (Sol-1) and (Sol-2) with oxalic acid at stoichiometric ratio was done under warm conditions, and with stirring at 90 C/15 min. Then a gradual dropping of 10 M solution of sodium hydroxide was added to the oxalate solution with continuous stirring at 90 C/ 72 h. [7][8][9][10] The resultant powder was washed and filtered for five times with distilled water, then characterized by X-ray diffraction XRD analysis. The steps for preparation of BNT via a hydrothermal process is shown in Fig.…”

Section: Experimental Workmentioning

confidence: 99%

Dielectric properties of BNT-xBT prepared by hydrothermal process

Mahmood

Al‐Shakarchi

2017

J. Adv. Dielect.

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The BNT ceramic sample might be a good replacement for PZT piezoelectric in industrial applications, especially in energy harvesting from crystal vibrations. In order to enhance the performance of BNT ceramic, the solid solution was chosen by substitution with Ba þ2 at Morphtropic Phase Boundary (MPB). The BNT-xBT powders with x ¼ 1, 0.07, 0.06 and 0 were prepared by the hydrothermal method with average particle size (65-150 nm) at (90 C/72 h). The ceramic disc was sintered at (1150 C/4 h) and showed excellent relative density of about 96%. The results of X-ray diffraction (XRD) confirmed the MPB for x ¼ 0:06 and 0.07, while the BNT had a rhombohedral structure and BT had a tetragonal structure. The dielectric measurements showed that BNT, BNT-7BT, BNT-6BT behave as the relaxator ferroelectric and showed a strong dependence on frequency, especially in the MPB region while BT behaves as a normal ferroelectric. Both the Curie temperature and depolarization temperature decrease at the MPB region and showed strong dependency on frequency.

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Section: Experimental Workmentioning

confidence: 99%

Dielectric properties of BNT-xBT prepared by hydrothermal process

Mahmood

Al‐Shakarchi

2017

J. Adv. Dielect.

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“…Average grain size increases without the solute drag effect as the amount of Bi 2 O 3 increases, as shown in Figure 2. Most previous studies investigated the electrical properties in the NBT-5BT system; however, they focused on the effect of processing parameters such as synthesis methods [36,[44][45][46], sintering temperature, morphotropic phase boundary (MPB) [47,48], and amounts of additive elements [37,49] on the microstructure and dielectric properties. A previous study [37] investigated the effect of adding Bi 2 O 3 on microstructure and dielectric-temperature curves.…”

Section: Resultsmentioning

confidence: 99%

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

et al. 2020

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The grain growth behavior of 0.95(Na0.5Bi0.5)TiO3 –0.05BaTiO3 (mole fraction, NBT–5BT) grains was investigated with excess Bi2O3 addition. The powder compacts of NBT–5BT were sintered at 1200 °C for various sintering times and with various amounts of Bi2O3 (0.1, 1.5, 4.0 and 10.0 mol%). When Bi2O3 was added to round-edged cubic NBT–5BT, the grain shape changed to a more faceted cube and the amount of liquid phase increased during sintering. A more faceted cubic grain shape indicates an increase in the critical driving force for appreciable growth of grains. However, obvious abnormal grain growth did not appear in any of the NBT–5BT samples with excess Bi2O3. The amount of liquid phase increased as the amount of Bi2O3 increased. Therefore, the rate of grain growth could be decreased by the increasing the distance for the diffusion of atoms. These observations allowed us to conclude that the growth of Bi2O3-excess NBT–5BT grains is governed by the growth of facet planes via the two-dimensional nucleation grain growth mechanism during changing grain shape and amount of liquid.

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“…But most of them were prepared by solid phase, it is difficult to control the core–shell structure, which is not conducive to the preparation of miniaturization of MLCC components. Bismuth compounds are highly suitable candidates to improve the T C of BaTiO 3 ‐based ceramics, such as Na 0.5 Bi 0.5 TiO 3 , Bi 4 Ti 3 O 12 , and Bi(Mg 1/2 Ti 1/2 )O 3 . Nb 2 O 5 ‐modified Ba 0.991 Bi 0.006 TiO 3 ceramics prepared using precipitation coating method was found to satisfy X8R specification in our previous study, and the dielectric properties needs to be further improved .…”

Section: Introductionmentioning

confidence: 86%

Core–Shell Structure and Dielectric Properties of Ba_0.991Bi_0.006TiO₃@Nb₂O₅–Co₃O₄ Ceramics

et al. 2016

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To meet the needs of future multilayer ceramic capacitors (MLCCs), thinner dielectric layers are necessary. To achieve this goal, the grain size and uniformity of the particles must be effectively controlled. In this study, we confirmed a core-shell particle structure by means of X-ray diffraction, scanning electron microscopy, and energy-dispersive spectroscopy. The dielectric properties of the ceramics were measured using an LCR meter. We found Ba 0.991 Bi 0.006 TiO 3 particles form a core that was coated with a homogeneous Nb 2 O 5 -Co 3 O 4 layer (~9 nm). The relationship between core-shell structure and e r -T curves of the Ba 0.991 Bi 0.006 TiO 3 @Nb 2 O 5 -Co 3 O 4 ceramics by different sintering temperature has been investigated. Dense, fine-grained Ba 0.991 Bi 0.006 TiO@Nb 2 O 5 -Co 3 O 4 ceramics were obtained by sintering at 1160°C. The ceramics met the X8R requirements, with a maximum dielectric constant of 2795, and a low dielectric loss at room temperature of 0.89%.

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Dielectric and piezoelectric behaviors of NBT-BT0.05 processed by sol–gel method

Cited by 45 publications

References 31 publications

Dielectric properties of BNT-xBT prepared by hydrothermal process

Dielectric properties of BNT-xBT prepared by hydrothermal process

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

Core–Shell Structure and Dielectric Properties of Ba_0.991Bi_0.006TiO₃@Nb₂O₅–Co₃O₄ Ceramics

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Dielectric and piezoelectric behaviors of NBT-BT0.05 processed by sol–gel method

Cited by 45 publications

References 31 publications

Dielectric properties of BNT-xBT prepared by hydrothermal process

Dielectric properties of BNT-xBT prepared by hydrothermal process

Grain Growth Behavior of 0.95(Na0.5Bi0.5)TiO3–0.05BaTiO3 Controlled by Grain Shape and Second Phase

Core–Shell Structure and Dielectric Properties of Ba0.991Bi0.006TiO3@Nb2O5–Co3O4 Ceramics

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Core–Shell Structure and Dielectric Properties of Ba_0.991Bi_0.006TiO₃@Nb₂O₅–Co₃O₄ Ceramics