Academic Journal
Enhanced electrocaloric effect near polymorphic phase boundary in lead-free potassium sodium niobate ceramics
| العنوان: | Enhanced electrocaloric effect near polymorphic phase boundary in lead-free potassium sodium niobate ceramics |
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| المؤلفون: | Wang, Xiangjian, Wu, Jiagang, Dkhil, Brahim, Xu, Baixiang, Wang, Xiaopeng, Dong, Guohua, Yang, Guang, Lou, Xiaojie |
| المساهمون: | department of Materials Science, Sichuan University Chengdu (SCU), Laboratoire Structures, Propriétés et Modélisation des solides (SPMS), Institut de Chimie - CNRS Chimie (INC-CNRS)-CentraleSupélec-Centre National de la Recherche Scientifique (CNRS), Institute of Materials Science, Technische Universitat, Electronic Materials Research Laboratory, Xi'an Jiaotong University (Xjtu), Fundamental Research Funds for the Central Universities 2013JDGZ03LabexFonds National de la Recherche LuxembourgNational Natural Science Foundation of ChinaCanadian Spine Society IRT13034, YK2015-0602006Agence Nationale de la Recherche ANR10-LABX-003551372195, 41372055DFG Xu121/1, DFG SPP1599Department of Forestry and Natural Resources, Purdue University 16/1159210, ANR-10-LABX-0035,Nano-Saclay,Paris-Saclay multidisciplinary Nano-Lab(2010) |
| المصدر: | ISSN: 0003-6951. |
| بيانات النشر: | HAL CCSD American Institute of Physics |
| سنة النشر: | 2017 |
| مصطلحات موضوعية: | Diffuseness of the phase transition, Electro-caloric effects, Ferroelectric phase transition, Operational temperature, Polarization rotation, Potassium sodium niobate, Temperature changes, Thermodynamic methods, Phase transitions, Ceramic materials, Ferroelectric ceramics, Ferroelectric materials, Phase boundaries, Pyroelectricity, Sodium, Temperature, [SPI.MAT]Engineering Sciences [physics]/Materials |
| الوصف: | International audience ; The electrocaloric (EC) effect in lead-free (1-x)(K0.48Na0.52)(Nb0.95Sb0.05)O3-xBi0.5(Na0.82K0.18)0.5ZrO3 ceramics was investigated using an indirect thermodynamic method. Large EC temperature changes were obtained in the vicinity of a polymorphic phase boundary at 40 kV/cm, e.g., 0.32 K at 359 K for x = 0.03, 0.51 K at 350 K for x = 0.04, and 0.48 K at 300 K for x = 0.05, respectively. These values are larger than the previous results at inter-ferroelectric phase transition and, more interestingly, are found to be comparable to those usually explored at the Curie temperature. The operational temperature window is broad near the polymorphic phase boundary due to the diffuseness of the phase transition. The enhanced electrocaloric effect is attributed to the formation of nanodomains near the polymorphic phase boundary, which reduces domain wall energy and facilitates the polarization rotation. The construction of a polymorphic phase boundary and the arrangement of coexisting phases at the nanoscale may open a promising route to explore EC materials. © 2017 Author(s). |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | hal-02317037; https://centralesupelec.hal.science/hal-02317037; https://centralesupelec.hal.science/hal-02317037/document; https://centralesupelec.hal.science/hal-02317037/file/1.4976026.pdf |
| DOI: | 10.1063/1.4976026 |
| الاتاحة: | https://centralesupelec.hal.science/hal-02317037 https://centralesupelec.hal.science/hal-02317037/document https://centralesupelec.hal.science/hal-02317037/file/1.4976026.pdf https://doi.org/10.1063/1.4976026 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.352BDCE0 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1063/1.4976026 |
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