Preparation and dielectric properties of X9R core–shell BaTiO3 ceramics coated by BiAlO3–BaTiO3

Liu, Mengying; Hao, Hua; Chen, Weijin; Zhou, Dong‐Dong; Appiah, Millicent; Liu, Binzhi; Cao, Minghe; Yao, Zhonghua; Liu, Hanxing; Zhang, Zishan

doi:10.1016/j.ceramint.2015.08.120

Cited by 22 publications

(9 citation statements)

References 33 publications

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“…The difference peak position and peak shape mean that the MLCC chips may also be two phases (pseudocubic and cubic) coexistence above the temperature of 175°C. MLCC chips possess two phases at any time which means it may be a core‐shell structure . The core is pure BTBNT and the shell is Nb‐ and Mn‐modified BTBNT.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

et al. 2019

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BaTiO 3 -(Bi 0.5 Na 0.5 )TiO 3 (BTBNT)-based multilayer ceramic capacitor (MLCC) chips with the inner electrodes being Ag0.6/Pd0.4 are prepared by a roll-to-roll casting method. The BTBNT-based MLCC chips with ten-dielectric layers can be sintered very well at a low temperature of 1130°C via two-step sintering (TSS). X-ray diffraction (XRD) and transmission electron microscope (TEM) resultsshow that MLCC chips are a core-shell structure with two phases coexistence.The core exhibits a tetragonal phase at room temperature and then gradually changes into a cubic phase when the temperature increases above T c (175°C).While, the shell exhibits a pseudocubic phase at all tested temperature from 25°C to 500°C. BTBNT-based MLCC chips exhibit a broad temperature stability and meet the requirement of Electronic Industries Association (EIA) X9R specifications. In terms of energy storage performance, a large discharge energy density of 3.33 J/cm 3 can be obtained at 175°C under the applied electric field of 480 kV/ cm. Among all tested temperature ranging from −50°C to 200°C, the energy efficiency of all chips is higher than 80%, even under a high applied electric field.The experimental results indicate that this novel BTBNT-based X9R MLCCs can be one of the most promising candidates for energy storage applications, especially operated in high temperature. K E Y W O R D Score-shell structure, energy storage, multilayer ceramic capacitor (MLCC), two-step sintering (TSS), X9R

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Section: Resultsmentioning

confidence: 99%

Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

et al. 2019

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“…At present, the highest dielectric constant of BaTiO 3 ‐based ceramic is 2458 at 20°C, and the highest dielectric constant of K 0.5 Na 0.5 NbO 3 ‐based ceramic is 2310 . The dielectric constants of most BaTiO 3 ‐based ceramics are lower than 2000 . It is necessary to improve the dielectric constant of BaTiO 3 ‐based ceramic up to 2000 and dielectric loss lower than 2% at temperature of 25°C.…”

Section: Introductionmentioning

confidence: 99%

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO₃–(Bi_0.5Na_0.5)TiO₃ ceramics

et al. 2019

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We fabricated x(Bi0.5Na0.5)TiO3–(1−x)[BaTiO3–(Bi0.5Na0.5)TiO3–Nb] (BNT‐doped BTBNT‐Nb) dielectric materials with high permittivity and excellent high‐temperature energy storage properties. The initial powder of Nb‐modified BTBNT was first calcined and then modified with different stoichiometric ratios of (Bi0.5Na0.5)TiO3 (BNT). Variable‐temperature X‐ray diffraction (XRD) results showed that the ceramics with a small amount of BNT doping consisted of coexisting tetragonal and pseudocubic phases, which transformed into the pseudocubic phase as the test temperature increased. The results of transmission electron microscopy (TEM) showed that the ceramic grain was the core‐shell structure. The permittivity of the 5 mol% BNT‐doped BTBNT‐Nb ceramic reached up to 2343, meeting the X9R specification. The discharge energy densities of all samples were 1.70‐1.91 J/cm3 at room temperature. The discharge energy densities of all samples fluctuated by only ±5% over the wide temperature range from 25°C to 175°C and ±8% from 25°C to 200°C. The discharge energy density of the 50 mol% BNT‐doped BTBNT‐Nb ceramic was 2.01 J/cm3 at 210 kV/cm and 175°C. The maximum energy efficiencies of all ceramics were up to ~91% at high temperatures and were much better than those at room temperature. The stable dielectric properties within a wide temperature window and excellent high‐temperature energy storage properties of this BNT‐doped BTBNT‐Nb system make it promising to provide candidate materials for multilayer ceramic capacitor applications.

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“…For example, a ± 15% temperature variation in TCC across a temperature window of -55 to +125 o C is known as X7R. TCC changes can also be asymmetric, such as Z5U, which allows TCC changes of +22 to -56% over a temperature from +10 to +85 o C. The overall permittivity-temperature (-T) profile depends on many parameters, including but not limited to; BT grain size, B/T ratio, dopant concentration(s)/distribution(s), volume fraction of grain core and shell regions, thickness of the dielectric layers and the applied electric field [6][7][8][9][10][11][12][13][14][15][16][17]. Through an intensive trial and error process, various ceramic formulations [18] and device processing conditions (i.e.…”

Section: Introductionmentioning

confidence: 99%

Resource efficient exploration of ternary phase space to develop multi-layer ceramic capacitors

2021

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Preparation and dielectric properties of X9R core–shell BaTiO3 ceramics coated by BiAlO3–BaTiO3

Cited by 22 publications

References 33 publications

Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO₃–(Bi_0.5Na_0.5)TiO₃ ceramics

Resource efficient exploration of ternary phase space to develop multi-layer ceramic capacitors

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Preparation and dielectric properties of X9R core–shell BaTiO3 ceramics coated by BiAlO3–BaTiO3

Cited by 22 publications

References 33 publications

Multifunctional BaTiO3‐(Bi0.5Na0.5)TiO3‐based MLCC with high‐energy storage properties and temperature stability

Multifunctional BaTiO3‐(Bi0.5Na0.5)TiO3‐based MLCC with high‐energy storage properties and temperature stability

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO3–(Bi0.5Na0.5)TiO3 ceramics

Resource efficient exploration of ternary phase space to develop multi-layer ceramic capacitors

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Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

Multifunctional BaTiO₃‐(Bi_0.5Na_0.5)TiO₃‐based MLCC with high‐energy storage properties and temperature stability

High permittivity and excellent high‐temperature energy storage properties of X9R BaTiO₃–(Bi_0.5Na_0.5)TiO₃ ceramics