Journal of Inorganic Materials ›› 2023, Vol. 38 ›› Issue (10): 1200-1206.DOI: 10.15541/jim20230072

• RESEARCH ARTICLE • Previous Articles     Next Articles

Preparation and Thermal Property of PrAlO3 Ceramics

GU Junyi1,2(), FAN Wugang1, ZHANG Zhaoquan1(), YAO Qin1(), ZHAN Hongquan2   

  1. 1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
    2. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China
  • Received:2022-02-13 Revised:2023-03-29 Published:2023-10-20 Online:2023-06-01
  • Contact: ZHANG Zhaoquan, professor. E-mail:;
    YAO Qin, associate professor. E-mail:
  • About author:GU Junyi (1997-), male, Master candidate. E-mail:
  • Supported by:
    National Science and Technology Major Project of China(2017ZX06002004);National Natural Science Foundation of China(52062020)


Perovskite-structured praseodymium aluminum oxide (PrAlO3) 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 PrAlO3 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 PrAlO3 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 PrAlO3 powder at 1200 ℃ and adding 0.4%-1.0%(in mass) TEOS as a liquid phase sintering aid, PrAlO3 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 PrAlO3 ceramic at a subcritical temperature of 360 ℃ was 4.99 W·m-1·K-1, superior to those of Dy2TiO5 and GdAlO3 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 PrAlO3 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 PrAlO3 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.

Key words: PrAlO3, perovskite phase, thermophysical property, nuclear materials

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