Large electrocaloric effect in BaTiO3 based multilayer ceramic capacitors

Lü, Biao; Wen, Xinhua; Tang, Zhenhua; Liang, Bo; Tao, Tao; Xie, Zheng; Zhang, Tian-Fu; Tang, Xin‐Gui; Xiang, Yong; Liao, Jie; Lu, Sheng‐Guo

doi:10.1007/s11431-016-6079-1

Cited by 18 publications

(9 citation statements)

References 19 publications

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“…With high breakdown strength, the nanocomposites can operate efficiently at both relatively low and high electric fields. It is found that the P(VDF-TrFE-CFE)-BNNSs-BST1/2/3 nanocomposite exhibits a giant Q of 100 MJ m –3 , Δ S of 310 kJ m –3 K –1 , and Δ T of 35 °C at an electric field of 200 MV m –1 , as shown in Figures c and S20, which not only surpass the pure ferroelectric polymer, but also exceed most inorganic ferroelectric materials. ,, The maximum electric field in the EC measurements is deliberately set at about half to the breakdown strength of the samples, which is predicted by the theoretical calculations of dielectric materials with a lifetime of 10 years . Concurrently, as shown in Figures a and S17a and c, under a relatively low electric field of 75 MV m –1 , a sizable ECE, that is, Q of 25 MJ m –3 , Δ S of 70 kJ m –3 K –1 , and Δ T of 8 °C, is obtained in the nanocomposites, which is ∼2 times superior to that of pristine P(VDF-TrFE-CFE), and comparable to the ECE generated in the P(VDF-TrFE-CFE)-BST1/2/3 binary nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

Ferroelectric Polymer Nanocomposites with Complementary Nanostructured Fillers for Electrocaloric Cooling with High Power Density and Great Efficiency

Zhang

Fan

Zhao

et al. 2018

ACS Appl. Energy Mater.

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The exploration of electrocaloric cooling is of great importance to address the environmental and energyefficiency issues in the currently available refrigeration technologies. Although pronounced electrocaloric effect (ECE) has been demonstrated in ferroelectric materials, it is a necessary but far from sufficient condition to achieve substantial cooling. For instance, the narrow operation temperature windows and limited thermal conductivities of ferroelectric materials pose challenging obstacles for ferroelectric materials to realize high cooling power density and great cooling efficiency. In this work, we present polymer nanocomposites with multiple nanostructured fillers, including barium strontium titanate nanowires (BST NWs) with systematically varied Curie temperatures and boron nitride nanosheets (BNNSs). The introduced BST NWs effectively enhance EC strength and significantly extend the operating temperature so that giant ECE is achieved at relatively low electric fields in a wide temperature range. Meanwhile, it is found that BNNSs form an electrically insulating and thermally conductive network in the nanocomposites, resulting in remarkable enhancements in dielectric breakdown strength and thermal conductivity. As validated by the finite element simulations, the synergistic integration of multiple components with complementary functionalities, such as BST NWs and BNNSs, in the ferroelectric polymer renders the nanocomposites with unprecedented high cooling power densities and great cooling efficiencies. Coupled with the facile processability of polymers and lead-free nature of electroactive ceramics, the polymer nanocomposites unleash the immense potential of ECE for environmentally friendly and highly efficient cooling applications.

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Section: Resultsmentioning

confidence: 99%

Ferroelectric Polymer Nanocomposites with Complementary Nanostructured Fillers for Electrocaloric Cooling with High Power Density and Great Efficiency

Zhang

Fan

Zhao

et al. 2018

ACS Appl. Energy Mater.

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“…This is because the indirect method only calculates the polarization along the direction of the electric field. The direct method, however, will measure the temperature change caused by the polarization in all directions …”

Section: Resultsmentioning

confidence: 99%

Direct and indirect measurement of large electrocaloric effect in barium strontium titanate ceramics

Dai

Wang

Huang

et al. 2019

Int J Applied Ceramic Tech

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Barium strontium titanate (Ba1‐xSrxTiO3‐BST) ceramics, where x = 0.05, 0.15, 0.25, and 0.35, was prepared via a solid‐state reaction method. The lattice structures and morphologies of the ceramic samples were analyzed using X‐ray diffraction and scanning electron microscopy technologies. The dielectric and ferroelectric properties of the BST ceramics were characterized using a precision impedance analyzer and a ferroelectric polarization‐electric field (P‐E) hysteresis loop tester, respectively. The electrocaloric effect was indirectly calculated using the Maxwell relations and P‐E loops as a function of temperature and electrical field, and also directly measured using a computer‐controlled thermocouple and high‐voltage power supply. An adiabatic temperature change of 1.82 K was procured, indicating a promising potential in the applications as cooling devices.

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“…It has been reported in general that the activation energy value of 1.9 eV was associated with an avalanche breakdown mode [20]; while this can be in a range of 1.25–1.42 eV for the thermal activated failure [21,22]. Other authors have suggested that for a thermal breakdown in MLCCs, the E a will fall within the range of 1–2 eV [22].…”

Section: Resultsmentioning

confidence: 99%

Reliability of X7R Multilayer Ceramic Capacitors During High Accelerated Life Testing (HALT)

et al. 2018

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Multilayer ceramic capacitors (MLCC) are essential components for determining the reliability of electronic components in terms of time to failure. It is known that the reliability of MLCCs depends on their composition, processing, and operating conditions. In this present work, we analyzed the lifetime of three similar X7R type MLCCs based on BaTiO3 by conducting High Accelerated Life Tests (HALT) at temperatures up to 200 °C at 400 V and 600 V. The results were adjusted to an Arrhenius equation, which is a function of the activation energy (Ea) and a voltage stress exponent (n), in order to predict their time to failure. The values of Ea are in the range of 1–1.45 eV, which has been reported for the thermal failure and dielectric wear out of BaTiO3-based dielectric capacitors. The stress voltage exponent value was in the range of 4–5. Although the Ea can be associated with a failure mechanism, n only gives an indication of the effect of voltage in the tests. It was possible to associate those values with each type of tested MLCC so that their expected life could be estimated in the range of 400–600 V.

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Large electrocaloric effect in BaTiO3 based multilayer ceramic capacitors

Cited by 18 publications

References 19 publications

Ferroelectric Polymer Nanocomposites with Complementary Nanostructured Fillers for Electrocaloric Cooling with High Power Density and Great Efficiency

Ferroelectric Polymer Nanocomposites with Complementary Nanostructured Fillers for Electrocaloric Cooling with High Power Density and Great Efficiency

Direct and indirect measurement of large electrocaloric effect in barium strontium titanate ceramics

Reliability of X7R Multilayer Ceramic Capacitors During High Accelerated Life Testing (HALT)

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