Effect of oxygen vacancy and A-site-deficiency on the dielectric performance of BNT-BT-BST relaxors

Liu, Xiao; Rao, Rongrong; Shi, Jing; He, Jiayi; Zhao, Yuchao; Liu, Jia; Du, Huiling

doi:10.1016/j.jallcom.2021.159999

Cited by 62 publications

(28 citation statements)

References 68 publications

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“…On the other hand, several research studies have made efforts to obtain functional performance in a wide T span by introducing A-site vacancies. Liu et al observed that suitable addition of Sr 0.7 Bi 0.2 □ 0.1 TiO 3 (SBT) can improve the polarization of BNT-6BT . Shi et al introduced SBT into NBT and realized a temperature-stable energy storage performance at 30–140 °C .…”

Section: Introductionmentioning

confidence: 99%

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Zhu

Wei

et al. 2021

ACS Appl. Electron. Mater.

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Probing a lead-free ferroelectric with a large electrocaloric effect (ECE) and excellent temperature stability is a challenge in developing solid-state electrocaloric refrigeration. In this work, we constructed 0.93(Na 1/2 Bi 1/2 )TiO 3 -0.07[(1 − x)-BaTiO 3 -x(Nd 2/3 □ 1/3 )(Zn 1/3 Nb 2/3 )O 3 ] (NZN100x) lead-free ferroelectric ceramics by introducing A-site vacancies and B-site complex cations simultaneously. Direct electrocaloric measurement shows that, for x = 0.14, a high ΔT of 1.17 K was obtained at 45 °C under 5 kV/mm; meanwhile, the sample x = 0.20 gives a large ΔT of 0.91 K with a 10% variation in a wide temperature span (T span ) from 40 to 80 °C. The excellent ECE performance opens up a route for designing lead-free electrocaloric materials based on the synergic effect of composition design and defect engineering. KEYWORDS: (Na 1/2 Bi 1/2 )TiO 3 , lead-free ceramics, A-site vacancy, B-site complex cation, electrocaloric effect, temperature stability

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Section: Introductionmentioning

confidence: 99%

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Zhu

Wei

et al. 2021

ACS Appl. Electron. Mater.

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“…The increasing energy demand will require improving the energy efficiency of heat transfer applications [1,2]. Due to high energy demand, renewable energies, especially solar energy, have been widely employed in recent decades [3,4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

Zhu

Mashayekhi

et al. 2021

Nanomaterials

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The hydrothermal performance of multiple semi-twisted tape inserts inside a heat exchanger pipe is numerically examined in three-dimensions. This study aims to find the optimum case for having the highest heat transfer enhancement with the lowest friction factor using nanofluid (Al2O3/water). A performance evaluation criterion (PEC) is defined to characterize the performance based on both friction factor and heat transfer. It was found that increasing the number of semi-twisted tapes increases the number of swirl flow streams and leads to an enhancement in the local Nusselt number as well as the friction factor. The average Nusselt number increases from 15.13 to 28.42 and the average friction factor enhances from 0.022 to 0.052 by increasing the number of the semi-twisted tapes from 0 to 4 for the Reynolds number of 1000 for the base fluid. By using four semi-twisted tapes, the average Nusselt number increases from 12.5 to 28.5, while the friction factor reduces from 0.155 to 0.052 when the Reynolds number increases from 250 to 1000 for the base fluid. For the Reynolds number of 1000, the increase in nanofluid concentration from 0 to 3% improves the average Nusselt number and friction factor by 6.41% and 2.29%, respectively. The highest PEC is equal to 1.66 and belongs to the Reynolds number of 750 using four semi-twisted tape inserts with 3% nanoparticles. This work offers instructions to model an advanced design of twisted tape integrated with tubes using multiple semi-twisted tapes, which helps to provide a higher amount of energy demand for solar applications.

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“…In that case, it can also harm the battery pack by intruding on external objects, which can lead to the mechanical deformation of lithium-ion cells. These external objects can occur from various directions, e.g., in-plane loading, which can compress the cell's narrow border, and out-of-plane indentation, which can punch a vast surface of pouch cell perpendicularly [50][51][52]. Electricity, thermal, and mechanical integrities are the three main factors that are mutually related to battery protection [53,54].…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Indentation Punch on High Energy Lithium Pouch Cells and Simulated Model Improvement

Ashfaq

Shi

et al. 2021

Polymers

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In this research, the aim relates to the material characterization of high-energy lithium-ion pouch cells. The development of appropriate model cell behavior is intended to simulate two scenarios: the first is mechanical deformation during a crash and the second is an internal short circuit in lithium-ion cells during the actual effect scenarios. The punch test has been used as a benchmark to analyze the effects of different state of charge conditions on high-energy lithium-ion battery cells. This article explores the impact of three separate factors on the outcomes of mechanical punch indentation experiments. The first parameter analyzed was the degree of prediction brought about by experiments on high-energy cells with two different states of charge (greater and lesser), with four different sizes of indentation punch, from the cell’s reaction during the indentation effects on electrolyte. Second, the results of the loading position, middle versus side, are measured at quasi-static speeds. The third parameter was the effect on an electrolyte with a different state of charge. The repeatability of the experiments on punch loading was the last test function analyzed. The test results of a greater than 10% state of charge and less than 10% state of charge were compared to further refine and validate this modeling method. The different loading scenarios analyzed in this study also showed great predictability in the load-displacement reaction and the onset short circuit. A theoretical model of the cell was modified for use in comprehensive mechanical deformation. The overall conclusion found that the loading initiating the cell’s electrical short circuit is not instantaneously instigated and it is subsequently used to process the development of a precise and practical computational model that will reduce the chances of the internal short course during the crash.

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Effect of oxygen vacancy and A-site-deficiency on the dielectric performance of BNT-BT-BST relaxors

Cited by 62 publications

References 68 publications

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

Performance Analysis of Indentation Punch on High Energy Lithium Pouch Cells and Simulated Model Improvement

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Effect of oxygen vacancy and A-site-deficiency on the dielectric performance of BNT-BT-BST relaxors

Cited by 62 publications

References 68 publications

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na1/2Bi1/2)TiO3-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na1/2Bi1/2)TiO3-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Evaluation of Multiple Semi-Twisted Tape Inserts in a Heat Exchanger Pipe Using Al2O3 Nanofluid

Performance Analysis of Indentation Punch on High Energy Lithium Pouch Cells and Simulated Model Improvement

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Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations

Achieving Large Electrocaloric Effect in a Wide Temperature Span for (Na_1/2Bi_1/2)TiO₃-Based Ceramics via the Synergic Effect of A-Site Vacancies and B-Site Complex Cations