Pb(Sc_(1/2)Nb_(1/2))O_(3)–Pb(Mg_(1/3)Nb_(2/3))O_(3)–Pb Ti O_(3)织构陶瓷的电学性能和热稳定性  

Electrical Properties and Thermal Stability of Pb(Sc_(1/2)Nb_(1/2))O_(3)-Pb(Mg_(1/3)Nb_(2/3))O_(3)-PbTiO_(3)Textured Ceramics

作　　者：陈怡菲 惠增哲[1] 郭菲菲 龙伟[1] 周宏桥 高建金 董文强 CHEN Yifei;XI Zengzhe;GUO Feifei;LONG Wei;ZHOU Hongqiao;GAO Jianjin;DONG Wenqiang(School of Materials and Chemical Engineering,Xi'an Technological University,Xi'an 710021,China;School of Electronics and Control Engineering,Chang'an University,Xi'an 710064,China;School of Mechanical and Electrical Engineering,Xi'an Technological University,Xi'an 710021,China)

机构地区：[1]西安工业大学材料与化工学院,西安710021 [2]长安大学电子与控制工程学院,西安710064 [3]西安工业大学机电工程学院,西安710021

出　　处：《硅酸盐学报》2024年第12期3789-3798,共10页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(11704249)。

摘　　要：采用BaTiO_(3)(BT)片状微晶制备了[001]取向的0.29PSN–0.39PMN–0.32PT(0.29Pb(Sc_(1/2)Nb_(1/2))O_(3)–0.39Pb(Mg_(1/3)Nb_(2/3))O_(3)–0.32PbTiO_(3))织构陶瓷。制备了不同模板含量的织构陶瓷,并在织构度、微观结构以及压电、铁电和介电性能方面进行了比较。在PSN–PMN–PT织构陶瓷中,在3%(体积分数)BaTiO_(3)模板下实现了高达98.6%的[001]织构度,并且获得了高的压电性能(d_(33)=816 pC/N,d_(33)^(*)=1080 pm/V)和高Curie温度(T_(c)=185℃),这远远优于随机取向的陶瓷。此外,与具有相近压电常数的铅基陶瓷相比,织构化PSN–PMN–PT陶瓷表现出显著改善的热稳定性。高质量的织构化三元陶瓷在新一代高性能、宽温度范围的机电器件中具有广阔的应用前景。Introduction As a core element of the sensor,the piezoelectric constant and dielectric constant of piezoelectric materials determine the sensitivity of the sensor.Piezoelectric materials with a high performance and a high stability are urgently needed.The electrical properties of perovskite ferroelectrics are closely related to the crystal orientation.Growing single crystals is thus an effective way to improve the electrical properties of perovskite ferroelectrics.However,the practical application of single crystals is limited due to their relatively high cost,low trigonal–rhombohedral phase transition temperature,and insufficient composition uniformity in inconsistent melting.To solve the above-mentioned single crystal application problems,the template grain growth(TGG)method for preparing textured ceramics is considered as one of the most promising methods.In this paper,a PSN–PMN–PT ternary solid solution piezoelectric material was prepared,and the[001]oriented growth of ceramics by TGG method was analyzed.In addition,the influence of template content on the phase structure,micromorphology,electrical properties and temperature stability of textured ceramics was also discussed.Methods Oxide raw materials were mixed in stoichiometric ratios and pre-sintered at 750℃for 2 h to form a pure perovskite structure.The[001]oriented BaTiO_(3)(BT)microcrystals were added as templates into a uniform slurry with 0.29Pb(Sc_(1/2)Nb_(1/2))O_(3)–0.39Pb(Mg_(1/3)Nb_(2/3))O_(3)–0.32PbTiO_(3)matrix powder,solvent,dispersant,plasticizer,and binder,and then ground in a ball mill.The BT templates with x of 0,1%,2%,3%,and 4%were added into the slurry.Afterwards,the slurry was cast via controlling the height of the scraper and the speed of the substrate.The dried raw embryo tapes were cut,stacked,and kept at 550℃for 2 h to remove organics.Finally,the samples were sintered at 1270℃for 9 h.The phase structure of the random and textured ceramics was determined by X-ray diffraction.The microstructure of the ceramics was chara

关 键 词：织构陶瓷 铌钪酸铅–铌镁酸铅–钛酸铅 压电性能 热稳定性 

分 类 号：TB34[一般工业技术—材料科学与工程]