PNZST:AlN复合陶瓷局域应力场增强热释电性能机理  

Mechanism of local stress field enhanced pyroelectric performance of PNZST:AlN composite ceramics

作　　者：李玲 潘天择 马家骏 张善涛 汪尧进 Li Ling;Pan Tian-Ze;Ma Jia-Jun;Zhang Shan-Tao;Wang Yao-Jin(School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;College of Engineering and Applied Science,Nanjing University,Nanjing 210023,China)

机构地区：[1]南京理工大学材料科学与工程学院,南京210094 [2]南京大学现代工程与应用科学学院,南京210023

出　　处：《物理学报》2022年第21期311-321,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11874032,52072178,52202139);中央高校基本科研业务费(批准号:30920041119,30922010402);中国博士后科学基金(批准号:2021M701716);江苏省“卓博计划”(批准号:2022ZB248)资助的课题。

摘　　要：通过两步固相反应烧结法制备了(1-x)Pb_(0.99)Nb_(0.02)[(Zr_(0.57)Sn_(0.43))_(0.94)Ti_(0.06)]_(0.98)O_(3):xAlN((1-x)PNZST:xAlN,x=0,0.1,0.2,0.3,0.4))复合陶瓷,系统研究了复合陶瓷晶体结构、微观形貌、畴结构演变以及铁电、介电和热释电性能等.实验结果表明:基于两相之间热膨胀系数失配产生的局域应力场有效调控了畴结构组态和相结构演变,在室温附近构建了铁电/反铁电相界,继而在温度场作用下表现出优异的热释电性能;当x=0.1时,在近人体温度37℃时其热释电系数p达到最大值3.30×10^(-3)C/(m^(2)⋅K),电流响应优值F_(i)=3.16×10^(-9)m/V,电压响应优值F_(v)=0.613 m^(2)/C,探测率优值F_(d)=4.40×10^(-4)Pa^(-1/2),且其半峰宽为16.3℃,在室温宽温域内表现出优异的热释电性能;随着AlN含量的增多,该复合陶瓷的热释电峰值温度在37-73℃宽温域内可调,表现出良好的温度稳定性.In this work,composite ceramics(1-x)Pb_(0.99)Nb_(0.02)[(Zr_(0.57)Sn_(0.43))_(0.94)Ti_(0.06)]_(0.98)O_(3):xAlN(abbreviated(1-x)PNZST:xAlN,x=0,0.1,0.2,0.3 and 0.4)are prepared by a two-step solid phase synthesis method.The crystal structures,micromorphologies,domain structure evolutions,ferroelectric,dielectric and pyroelectric properties of those composite ceramics are systematically investigated.The results show that the difference in thermal expansion coefficient between PNZST and AlN creates compressive stresses in the PNZST matrix when cooling down from the sintering temperature,then a metastable ferroelectric(FE)phase is induced in the anti-FE matrix by the AlN component-induced internal stress,and in turn ferroelectric/antiferroelectric phase boundary is constructed near room temperature.As the temperature increases,the ferroelectric-to-antiferroelectric phase transition causes a larger pyroelectric current peak.In particular,the composition with x=0.1 exhibits a high pyroelectric coefficient p=3.3×10^(-3) C⋅m^(-2)⋅K^(-1) and figure-of-merit with current responsivity F_(i)=3.16×10^(-9) m⋅V^(-1),voltage responsivity F_(v)=0.613 m^(2)⋅C^(-1),and detectivity F_(d)=4.4×10^(-4) Pa^(-1/2) around human body temperature.Moreover,the enhanced pyroelectric coefficient exists in a broad operation temperature range with a large full width at half maximums of 16.3℃at 37℃.With the increase of AlN content,the pyroelectric peak temperature of the composite ceramic is adjustable in a wide temperature range of 37-73℃,showing good temperature stability.

关 键 词：热释电 复合陶瓷 局域应力场 铁电畴 

分 类 号：TQ174.1[化学工程—陶瓷工业]