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The Electrocaloric Effect

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The Electrocaloric Effect in Ferroelectrics Nonlinear Modeling and Simulation

The Electrocaloric Effect in Ferroelectrics  Nonlinear Modeling and Simulation Book
Author : Anonim
Publisher : Unknown
Release : 2015
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract In this paper, the theoretical background of a physically based constitutive model is presented. In addition to the nonlinear ferroelectric behavior, the model considers the nonlinear coupling of thermal and electromechanical fields. Results are presented in terms of a simple analytical solution for a single domain configuration. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim).

Chip scale Cooling Devices Based On Electrocaloric Effect

Chip scale Cooling Devices Based On Electrocaloric Effect Book
Author : Haiming Gu
Publisher : Unknown
Release : 2014
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

The electrocaloric effect (ECE) is a temperature and entropy change of an insulating material when there is an electric field induced polarization change. Recently, giant ECE was discovered in a series of dielectric materials, such as Polyvinylidene fluoride (PVDF) based polymers and ferroelectric ceramics. The ECE induced adiabatic temperature change in these materials can be higher than 10 K which makes them attractive because they provide the unique opportunity to explore and develop solid state cooling devices which are compact while providing high cooling power density and high efficiency compare to other cooling techniques, such as vapor compression refrigeration(VCR), thermoelectric, thermoacoustic, etc. A few ECE refrigerators have been studied in previous publications. However, the performance of those devices are still not so attractive. Besides, most of the existing works are based on simulation, and very few work has prototype demonstration.In this thesis, two types of chip scale ECE based cooling devices with more advanced configurations have been proposed, studied, and experimentally demonstrated. One is named as ElectroCaloric Oscillatory Refrigerator (ECOR), which involves solid-state plates with anisotropic thermal conductivity as regenerators. The low thermal conductivity along the temperature gradient direction can reduce the heat conduction loss thus highly improve the performance of the device. Finite volume simulation shows that the temperature span (Tspan) of the refrigerator can be as large as around 50 K. The volumetric cooling power density Pc and coefficient of performance (COP) of the refrigerator was also studied. The maximum Pc can reach to 9.2 W/cm3, while the COP remains at 6.5, which is about 45% of the Carnot efficiency.A prototype of ECOR was experimentally demonstrated. The EC module with multilayer structure was fabricated with high energy electro irradiated poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) copolymer thin film. The regenerators with anisotropic thermal conductivity was realized by cutting thin slits in stainless steel plate and then refilled with epoxy. The testing results show that a maximum value of 6.6 K Tspan was obtained when the device was working at 1 Hz and with an electric field of 100 MV/m.The second proposed device configuration is based on a rotary structure. This refrigerator involves no external regenerators. Instead, the regeneration process is realized by direct heat exchange between EC materials. The 1-D simulation results show that the Tspan of the device is nearly proportional to the number of segments in one ring (Ns), and the ECE induced adiabatic temperature change (Delta TECE). Owing to the absence of external regenerators, the Pc of this device can reach 33 W/cm3. Meanwhile, the COP of the device keeps above 8.5, which is about 60% of Carnot efficiency. 3-D finite element simulation validates the 1-D simulation results. A preliminary prototype was fabricated to demonstrate the proposed concept. About 0.8 K Tspan was obtained across the device when Delta TECE is 0.4 K.Compare with the existing ECE cooling devices, the ECOR device in this thesis involves solid state regenerator with anisotropic thermal conductivity which can highly reduce the conduction heat loss and thus improve the performance of the device. In the rotary cooling device, novel regeneration process is designed so that no external regenerators are required which also highly improve the cooling power density and efficiency of the device. The ideas of both solid state regenerator with anisotropic thermal conductivity, and the novel regeneration process are the main contributions of this thesis and will stimulate the development of high performance ECE cooling devices in the future.

Electrocaloric Materials

Electrocaloric Materials Book
Author : Tatiana Correia,Qi Zhang
Publisher : Springer Science & Business Media
Release : 2013-11-29
ISBN : 364240264X
Language : En, Es, Fr & De

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Book Description :

Since the 1997 Kyoto protocol of reduction of greenhouse gas emissions, the development of novel refrigerators has been a priority within the scientific community. Although magnetocaloric materials are promising candidates, they still need a large magnetic field to induce a giant ΔT as well as powerful and costly magnets. However, in electrocaloric materials (ECMs) a temperature change may be achieved by applying or removing an electric field. Since a giant electrocaloric effect on ferroelectric thin films was reported in Science in 2006, researchers have been inspired to explore such effect in different ferroelectric thin films. This book reviews electrocaloric effects observed in bulk materials as well as recent promising advances in thin films, with special emphasis on the ferroelectric, antiferroelectric and relaxor nature of ECMs. It reports a number of considerations about the future of ECMs as a means of achieving an efficient, ecologically sustainable and low cost refrigerator.

Metrology of the Electrocaloric Effect Based on an Infrared Imaging Technique

Metrology of the Electrocaloric Effect Based on an Infrared Imaging Technique Book
Author : Maciej Konstanty Rokosz
Publisher : Unknown
Release : 2016
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Metrology of the Electrocaloric Effect Based on an Infrared Imaging Technique book written by Maciej Konstanty Rokosz, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Electrocaloric Effect of Ferroelectrics and Relaxors

Electrocaloric Effect of Ferroelectrics and Relaxors Book
Author : Yangbin Ma
Publisher : Unknown
Release : 2018
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Electrocaloric Effect of Ferroelectrics and Relaxors book written by Yangbin Ma, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Composition Dependence of Electrocaloric Effect in 1 X Pb Mg1 3Nb2 3 O3 xPbTiO3 Single Crystals Supported by the State Key Program of National Natural Science of China Under Grant No 51335002 Changzhou Science and Technology Project Under Grant No CJ20130022 and the Priority Academic Program Development of Jiangsu Higher Education Institutions on Renewable Energy Material Science and Engineering

Composition Dependence of Electrocaloric Effect in  1     X Pb Mg1 3Nb2 3 O3    xPbTiO3 Single Crystals Supported by the State Key Program of National Natural Science of China Under Grant No  51335002  Changzhou Science and Technology Project Under Grant No  CJ20130022  and the Priority Academic Program Development of Jiangsu Higher Education Institutions on Renewable Energy Material Science and Engineering Book
Author : Anonim
Publisher : Unknown
Release : 2015
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Abstract Composition dependence of electrocaloric effect is investigated in (1 − x)Pb(Mg1/3Nb2/3)O3 − xPbTiO3 single crystals by using an eighth-order Landau–Devonshire theory. The applied electric field along [001] direction reduces the ferroelectric-ferroelectric phase transition temperatures, but increases the Curie temperatures. The electrocaloric coefficients of tetragonal phase are much larger than that of rhombohedral and monoclinic phase. A negative electrocaloric effect is observed near the MC–T phase transition in 0.69Pb(Mg1/3Nb2/3)O3–0.31PbTiO3 single crystal. The application of a strong enough electric field results in a high adiabatic temperature change over a broad range of temperature. Therefore, it would be useful to construct a solid state cooling cycle over a broad temperature range for practical applications.

The Electrocaloric Effect of a New Kind of Impurity Mode

The Electrocaloric Effect of a New Kind of Impurity Mode Book
Author : Gaetano Lombardo
Publisher : Unknown
Release : 1971
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download The Electrocaloric Effect of a New Kind of Impurity Mode book written by Gaetano Lombardo, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

A Study of the Electrocaloric Effect in KCl Li

A Study of the Electrocaloric Effect in KCl Li Book
Author : Victor Lawrence Taylor
Publisher : Unknown
Release : 1968
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download A Study of the Electrocaloric Effect in KCl Li book written by Victor Lawrence Taylor, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Investigation of Electrocaloric Effects in Ferroelectric Substances

Investigation of Electrocaloric Effects in Ferroelectric Substances Book
Author : Gordon G. Wiseman
Publisher : Unknown
Release : 1968
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Investigation of Electrocaloric Effects in Ferroelectric Substances book written by Gordon G. Wiseman, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Magnetocaloric Energy Conversion

Magnetocaloric Energy Conversion Book
Author : Andrej Kitanovski,Jaka Tušek,Urban Tomc,Uroš Plaznik,Marko Ožbolt,Alojz Poredoš
Publisher : Springer
Release : 2014-12-03
ISBN : 331908741X
Language : En, Es, Fr & De

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Book Description :

This book provides the latest research on a new alternative form of technology, the magnetocaloric energy conversion. This area of research concerns magnetic refrigeration and cooling, magnetic heat pumping and magnetic power generation. The book’s systematic approach offers the theoretical basis of magnetocaloric energy conversion and its various sub domains and this is supported with the practical examples. Besides these fundamentals, the book also introduces potential solutions to engineering problems in magnetocalorics and to alternative technologies of solid state energy conversion. The aim of the book is therefore to provide engineers with the most up-to-date information and also to facilitate the understanding, design and construction of future magnetocaloric energy conversion devices. The magnetocaloric energy conversion represents an alternative to compressor based refrigerators and heat pumps. It is a serious alternative to power generation with low enthalpy heat sources. This green technology offers an opportunity to use environmentally friendly solid refrigerants and the potentially high energy efficiency follows the trends of future energy conversion devices. This book is intended for postgraduate students and researchers of refrigeration, heat pumping, power generation alternatives, heat regenerators and advanced heat transfer mechanisms.

Advances in Lead Free Piezoelectric Materials

Advances in Lead Free Piezoelectric Materials Book
Author : Jiagang Wu
Publisher : Springer
Release : 2018-08-22
ISBN : 9811089981
Language : En, Es, Fr & De

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Book Description :

This book systematically reviews the history of lead-free piezoelectric materials, including the latest research. It also addresses a number of important issues, such as new types of materials prepared in a multitude of sizes, structural and physical properties, and potential applications for high-performance devices. Further, it examines in detail the state of the art in lead-free piezoelectric materials, focusing on the pathways to modify different structures and achieve enhanced physical properties and new functional behavior. Lastly, it discusses the prospects for potential future developments in lead-free piezoelectric materials across disciplines and for multifunctional applications. Given its breadth of coverage, the book offers a comprehensive resource for graduate students, academic researchers, development scientists, materials producers, device designers and applications engineers who are working on or are interested in advanced lead-free piezoelectric materials.

Nanostructures in Ferroelectric Films for Energy Applications

Nanostructures in Ferroelectric Films for Energy Applications Book
Author : Jun Ouyang
Publisher : Elsevier
Release : 2019-06-06
ISBN : 0128138572
Language : En, Es, Fr & De

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Book Description :

Nanostructures in Ferroelectric Films for Energy Applications: Grains, Domains, Interfaces and Engineering Methods presents methods of engineering nanostructures in ferroelectric films to improve their performance in energy harvesting and conversion and storage. Ferroelectric films, which have broad applications, including the emerging energy technology, usually consist of nanoscale inhomogeneities. For polycrystalline films, the size and distribution of nano-grains determines the macroscopic properties, especially the field-induced polarization response. For epitaxial films, the energy of internal long-range electric and elastic fields during their growth are minimized by formation of self-assembled nano-domains. This book is an accessible reference for both instructors in academia and R&D professionals. Provides the necessary components for the systematic study of the structure-property relationship in ferroelectric thin film materials using case studies in energy applications Written by leading experts in the research areas of piezoelectrics, electrocalorics, ferroelectric dielectrics (especially in capacitive energy storage), ferroelectric domains, and ferroelectric-Si technology Includes a well balanced mix of theoretical design and simulation, materials processing and integration, and dedicated characterization methods of the involved nanostructures

Materials for Sustainable Energy Applications

Materials for Sustainable Energy Applications Book
Author : David Munoz-Rojas,Xavier Moya
Publisher : CRC Press
Release : 2017-03-27
ISBN : 131534131X
Language : En, Es, Fr & De

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Book Description :

The impending energy crisis brought on by the running out of finite and non-homogenously distributed fossil fuel reserves and the worldwide increase in energy demand has prompted vast research in the development of sustainable energy technologies in the last few decades. However, the efficiency of most of these new technologies is relatively small and therefore it needs to be increased to eventually replace conventional technologies based on fossil fuels. The required efficiency increase primarily relies on the ability to improve the performance of the functional materials which are at the heart of these technologies. The purpose of this book is to give a unified and comprehensive presentation of the fundamentals and the use and design of novel materials for efficient sustainable energy applications, such as conversion, storage, transmission, and consumption. The book presents general coverage of the use and design of advanced materials for sustainable energy applications. Thus, the book addresses all the relevant aspects, such as materials for energy conversion, storage, transmission, and consumption.

Soviet Physics Solid State

Soviet Physics  Solid State Book
Author : Anonim
Publisher : Unknown
Release : 1992
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Soviet Physics Solid State book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Synthesis and Characterization of Ferroelectrics

Synthesis and Characterization of Ferroelectrics Book
Author : Jan Dec
Publisher : MDPI
Release : 2021-01-21
ISBN : 3039436554
Language : En, Es, Fr & De

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Book Description :

The Special Issue on “Synthesis and Characterization of Ferroelectrics” reports on several physical properties of ferroelectric materials and their technological aspects. Different substitution mechanisms provide ideas toward future improvement of lead-free (Ba,Ca)(Zr,Ti)O3 piezoelectric ceramics, including the electrocaloric effect, fluorescence, and energy storage. It is established that axial and radial element segregation differently influences electrical properties of 0.68Pb(Mg1/3Nb2/3)0.32PbTiO3 (PMN-32PT for short) single crystals. While the electrical properties along the axial direction strongly depend on the PbTiO3 content, the electrical properties along the axial direction are mainly determined by the ratio of Nb and Mg. On the other hand, Fe-substitution of PMN-32PT crystals lead to an enhancement of the coercive field due to wall pinning induced by charged defect dipoles. It is also found, that capacitors based on Pt/Na0.5Bi0.5TiO3/La0.5Sr0.5CoO3 thin films display good fatigue resistance and retention. Another lead-free thin film capacitor fabricated from Ba0.3Sr0.7Zr0.18Ti0.82 features a low leakage current density and high breakdown strength. Such capacitors are essential for energy storage. Furthermore, an enhanced electrocaloric effect on 0.73Pb(Mg1/3Nb2/3)0.27PbTiO3 single crystals is demonstrated. This effect is promising for novel solid-state cooling systems.

Modern Crystallography

Modern Crystallography Book
Author : L. A. Shuvalov
Publisher : Springer Science & Business Media
Release : 1988
ISBN : 9783540115175
Language : En, Es, Fr & De

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Book Description :

Modern Crystallography IV is devoted to a systematic and up- to-date description of fundamental physical properties of solid and liquid crystals. These include elastic and mechanical, dielectric and ferroelectric, magnetic and optical properties, transport phenomena and spectroscopy. An important feature of the treatment is its use of the crystallographic approach, an introduction to which is given in the opening chapter of the book. The topics are treated at a level understandable to students who have two years of university physics. Researchers and engineers working on practical applications should also find the book useful, as should specialists in other fields who wish to broaden their knowledge of crystallography and materials science. The book is written by a group of leading scientists from the Institute of Crystallography of the USSR Academy of Sciences.

Proceedings ICT 02

Proceedings ICT 02 Book
Author : Anonim
Publisher : Unknown
Release : 2002
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Proceedings ICT 02 book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Soviet Journal of Quantum Electronics

Soviet Journal of Quantum Electronics Book
Author : Anonim
Publisher : Unknown
Release : 1978
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Soviet Journal of Quantum Electronics book written by , available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.