PrAlO_(3)陶瓷的制备及性能研究  

Preparation and Property of PrAlO_(3)Ceramics

作　　者：顾军毅 范武刚[1] 张兆泉[1] 姚琴[1] 展红全 GU Junyi;FAN Wugang;ZHANG Zhaoquan;YAO Qin;ZHAN Hongquan(Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China)

机构地区：[1]中国科学院上海硅酸盐研究所,上海200050 [2]景德镇陶瓷大学材料科学与工程学院,景德镇333403

出　　处：《无机材料学报》2023年第10期1200-1206,共7页Journal of Inorganic Materials

基　　金：国家重大科技专项基金(2017ZX06002004);国家自然科学基金(52062020)。

摘　　要：钙钛矿结构的铝酸镨(PrAlO_(3))具有较高的稳定性并能提供可被其它镧系稀土离子掺杂的格位,有望成为一种新型中子吸收材料基体,目前对PrAlO_(3)的研究主要集中在单晶材料的制备方法及其光学、磁学等特性。本工作采用固相反应合成法,以正硅酸乙酯(TEOS)作为液相助烧剂,制备了高致密度钙钛矿相PrAlO_(3)陶瓷,并采用XRD、SEM、顶杆法和激光闪光法系统表征了PrAlO_(3)陶瓷的显微结构及热物理性能。结果表明,通过在1200℃预先合成PrAlO_(3)粉体并添加质量分数为0.4%~1.0%的TEOS作为液相助烧剂,在1500℃左右烧结可获得相对密度大于99%的PrAlO_(3)陶瓷;而未添加助烧剂获得的产物相对密度仅为96%。PrAlO_(3)陶瓷在亚临界温度360℃时的热导率为4.99 W·m^(–1)·K^(–1),优于Dy_(2)TiO_(5)和GdAlO_(3)陶瓷,并且室温到800℃的线性热膨胀系数仅为10.2×10^(–6)K^(–1)。同时,PrAlO_(3)陶瓷的抗弯强度和维氏硬度分别达到95.55 MPa和7.95 GPa,荧光光谱表现出Pr3+的特征发射峰。研究结果显示,高密度钙钛矿相PrAlO_(3)陶瓷制备方法简单,具有较好的热物性和力学性能,作为一种稀土基中子吸收核用材料具有较好的应用前景。Perovskite-structured praseodymium aluminum oxide(PrAlO_(3))exhibits high stability which has a site that can be doped with other rare earth ions,enabling it a promising new neutron-absorbing material matrix.However,the current research on PrAlO_(3)mainly focuses on the preparation methods of single crystal materials and their optical and magnetic property.Here,we firstly prepared a high-density perovskite phase PrAlO_(3)ceramics by solid-phase reaction synthesis using tetraethyl orthosilicate(TEOS)as a liquid phase sintering aid,and then studied its microstructure and thermal property by XRD,SEM,push-rod technique,and laser flash method.The results showed that,by pre-synthesizing PrAlO_(3)powder at 1200℃and adding 0.4%–1.0%(in mass)TEOS as a liquid phase sintering aid,PrAlO_(3)ceramic with a relative density higher than 99%could be obtained at around 1500℃,while the relative density of the product without sintering aids was only 96%.The thermal conductivity of PrAlO_(3)ceramic at a subcritical temperature of 360℃was 4.99 W·m^(–1)·K^(–1),superior to those of Dy_(2)TiO_(5)and GdAlO_(3)ceramics,and its linear thermal expansion coefficient from room temperature to 800℃was only 10.2×10^(–6)K^(–1).Moreover,the bending strength and Vickers hardness of PrAlO_(3)ceramics reached 95.55 MPa and 7.95 GPa,respectively,and the fluorescence spectrum exhibited characteristic emission peaks of Pr3+.This study shows that high-density perovskite phase PrAlO_(3)ceramics can be prepared by a convenient method with good thermophysical property and mechanical property.They exhibit good application prospects as a rare earth-based neutron-absorbing nuclear material.

关 键 词：PrAlO_(3) 钙钛矿相 热物性能 核用材料 

分 类 号：TQ174[化学工程—陶瓷工业]