无铅Ba(GeTi)O陶瓷中的大电致热响应和储能响应

Large Electrocaloric Responsivity and Energy Storage Response in the Lead-Free Ba(GeTi)O Ceramics.

作者信息

Asbani Bouchra, Gagou Yaovi, Ben Moumen Said, Dellis Jean-Luc, Lahmar Abdelilah, Amjoud M'Barek, Mezzane Daoud, El Marssi Mimoun, Rozic Brigita, Kutnjak Zdravko

机构信息

Laboratoire de Physique de La Matière Condensée (LPMC), Université de Picardie, Jules Verne, 33 rue Saint-Leu, CEDEX 1, 80039 Amiens, France.

Unit of Dynamics and Structure of Molecular Materials-UDSMM (EA 4476), MREI-1, Université du Littoral Côte d'Opale, 59140 Dunkerque, France.

出版信息

Materials (Basel). 2022 Jul 28;15(15):5227. doi: 10.3390/ma15155227.

DOI:10.3390/ma15155227

PMID:35955158

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9369846/

Abstract

Ferroelectric property that induces electrocaloric effect was investigated in Ba(GeTi)O ceramics, known as BTGx. X-ray diffraction analysis shows pure perovskite phases in tetragonal symmetry compatible with the 4 (No. 99) space group. Dielectric permittivity exhibits first-order ferroelectric-paraelectric phase transition, confirmed by specific heat measurements, similar to that observed in BaTiO (BTO) crystal. Curie temperature varies weakly as a function of Ge-content. Using the direct and indirect method, we confirmed that the adiabatic temperature change Δ reached its higher value of 0.9 K under 8 kV/cm for the composition BTG6, corresponding to an electrocaloric responsivity ΔΔ of 1.13 × 10 K.m/V. Such electrocaloric responsivity significantly exceeds those obtained so far in other barium titanate-based lead-free electrocaloric ceramic materials. Energy storage investigations show promising results: stored energy density of ~17 mJ/cm and an energy efficiency of ~88% in the composition BTG5. These results classify the studied materials as candidates for cooling devices and energy storage applications.

摘要

在被称为BTGx的Ba(GeTi)O陶瓷中研究了诱导电热效应的铁电性能。X射线衍射分析表明，其纯钙钛矿相具有与4（编号99）空间群兼容的四方对称性。介电常数表现出一级铁电-顺电相变，这通过比热测量得到证实，类似于在BaTiO（BTO）晶体中观察到的情况。居里温度随锗含量的变化较弱。使用直接和间接方法，我们证实对于BTG6成分，在8 kV/cm下绝热温度变化Δ达到其较高值0.9 K，对应电热响应率ΔΔ为1.13×10 K·m/V。这种电热响应率显著超过了迄今为止在其他钛酸钡基无铅电热陶瓷材料中获得的响应率。储能研究显示出有前景的结果：在BTG5成分中储能密度约为17 mJ/cm，能量效率约为88%。这些结果将所研究的材料归类为冷却装置和储能应用的候选材料。