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Field-driven merging of polarizations and enhanced electrocaloric effect in BaTiO_(3)-based lead-free ceramics

Journal of Advanced Ceramics 2022年第11期11卷 1777-1788页

作者： Xiang NIU Xiaodong JIAN Weiping gong Wei LIANG xuetian gong Guangzu ZHANG Shenglin JIANG Kun YU Xiaobo ZHAO Yingbang YAO Tao TAO Bo LIANG Sheng-Guo LU Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter School of Materials and EnergyGuangdong University of TechnologyGuangzhou 510006China Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices Huizhou UniversityHuizhou 516007China Science and Technology on Reliability Physics and Application of Electronic Component Laboratory The 5th Electronics Research Institute of the Ministry of Industry and Information TechnologyGuangzhou 510610China Dongguan South China Design Innovation Institute Dongguan 523808China School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

Solid-state cooling technology based on electrocaloric effect(ECE)has been advanced as an alternative to replace the vapour-compression approach to overcome the releasing of the global warming ***,the development in high ECE materials is still a *** this work,polarization merging strategy was proposed to achieve a large ECE in xBa(Sn_(0.07)Ti_(0.93))O_(3)–(1−x)Ba(Hf_(0.1)Ti_(0.9))O_(3) ferroelectric ceramics,where x=0,0.2,0.4,0.6,0.8,and ***(Sn_(0.07)Ti_(0.93))O_(3) with an orthorhombic phase and Ba(Hf_(0.1)Ti_(0.9))O_(3) with a rhombohedral phase at room temperature were prepared beforehand as precursors,and phase-coexisted xBSnT–(1−x)BHfT ceramics were formed via a solid-state reaction *** coexisting structures were confirmed using the X-ray *** merged polarization was confirmed by the dielectric and ferroelectric *** ECEs were obtained for 0.2BSnT–0.8BHfT ceramics,i.e.,adiabatic temperature change DT=2.16±0.08 K at 80℃and 5 MV/m,and DT=3.35±0.09 K at 80℃and 7 MV/m.

关键词： lead-free ferroelectric microstructure permittivity polarization electrocaloric effect(ECE)

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Enhancing energy storage efficiency in lead-free dielectric ceramics through relaxor and lattice strain engineering

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Journal of Materiomics 2024年第6期10卷 1196-1205页

作者： xuetian gong Chao Zhang Dong Su Wenrong Xiao Fangjie Cen Ying Yang Shenglin Jiang Jing Wang Kanghua Li Guangzu Zhang School of Integrated Circuits Engineering Research Center for Functional Ceramics MOE and Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhanHubei430074China College of Chemnistry and Materials Science Hebei UniversityBaodingHebei071002China Key Lab of Functional Materials for Electronic Information(B) Ministry of EducationWuhanHubei430074China

Dielectric capacitors with high power density and fast charge-discharge speed play an essential role in the development of pulsed power *** increased demands for miniaturization and practicality of pulsed power equipment also necessitate the development of dielectric materials that possess high energy density while maintaining ultrahigh efficiency(η).In particular,ultrahigh efficiency signifies minimal energy loss,which is essential for practical applications but challenging to effectively ***,we demonstrate a strategy of incorporating heterovalent elements into Ba(Zr_(0.1)Ti_(0.9))O_(3),which contributes to achieving relaxor ferroelectric ceramics and reducing lattice strain,thereby improving the comprehensive energy storage ***,optimal energy storage performance is attained in 0.85Ba(Zr_(0.1)Ti_(0.9))O_(3)-0.15Bi(Zn_(2/3)Ta_(1/3))O_(3)(BZT-0.15BiZnTa),with an ultrahighηof 97.37%at 440 kV/cm(an advanced level in the lead-free ceramics)and an excellent recoverable energy storage density(Wrec)of 3.74 J/cm^(3).Notably,the BZT-0.15BiZnTa ceramics also exhibit exceptional temperature stability,maintaining fluctuations in Wrec within∼10%andηconsistently exceeding 90% across the wide temperature range of−55℃ to 160℃,and under a high electric field of 250 kV/*** these features demonstrate that the relaxor and lattice strain engineering strategies have been successful in achieving high-performance lead-free ceramics,paving the way for designing high-efficiency dielectric capacitors with a wide temperature range.

关键词： Energy storage Relaxor ferroelectrics Lead-free ceramics Lattice strain engineering

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临兴区块致密砂岩气3D井设计与施工

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石油机械 2016年第7期44卷 42-45页

作者：吴占民冯雷夏忠跃贾佳赵学田龚明中海油能源发展股份有限公司工程技术分公司

临兴区块位于鄂尔多斯盆地东北部伊陕斜坡东段、晋西挠褶带西缘,致密砂岩气埋藏较深,地层岩性复杂是制约该区块开发的主要因素。为此,在分析该区块作业难点的基础上,以一口开双靶点定向井(3D井)为例,对井眼轨迹、井身结构和固井方法进... 详细信息

临兴区块位于鄂尔多斯盆地东北部伊陕斜坡东段、晋西挠褶带西缘,致密砂岩气埋藏较深,地层岩性复杂是制约该区块开发的主要因素。为此,在分析该区块作业难点的基础上,以一口开双靶点定向井(3D井)为例,对井眼轨迹、井身结构和固井方法进行了设计,同时依据一开和二开所钻遇的地层特性对钻井液体系进行了优选。现场施工结果表明,3D井全井钻井周期21.07 d,作业时效96%,最大井斜角、裸眼段长度、井底水平位移及完钻井深均为临兴光导试验区记录,二开井段平均机械钻速相比邻井提高31%。所得结果可为区块的后续钻井作业提供参考。

关键词：临兴区块致密砂岩气地层岩性井身结构钻井液体系

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