Journal of Inorganic Materials, Volume. 38, Issue 7, 771(2023)

Structure and Optical Property of Pr2O3 Powder Prepared by Reduction

Junyi GU1,2, Wugang FAN2, Zhaoquan ZHANG2, Qin YAO2、*, and Hongquan ZHAN1、*
Author Affiliations
  • 11. School of Materials Science and Engineering, Jingdezhen Ceramic University, Jingdezhen 333403, China
  • 22. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
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    As an important raw material for synthesis of phosphor and laser gain medium, the sesquioxide of praseodymium (Pr2O3) receives few attentions due to its susceptibility to change of valence and hygroscopicity in air. Here, the reduction process from Pr6O11 to Pr2O3 and corresponding mechanism in air and Ar/H2 atmosphere as well as the crystal phases, morphologies, particle sizes and valence states of the two kinds of oxides were investigated. Furthermore, the photoluminescent properties of praseodymium oxide were analyzed in relation to the valence state of praseodymium. The results show that phase transition of Pr6O11 significantly varied in different atmospheres. Reduction of Pr6O11 is accelerated in Ar/H2 atmosphere and Pr2O3 can be obtained at 800 ℃. In addition to adsorption in ultraviolet region resulted from transition from valence to conductive band, the Pr2O3 containing Pr3+ also shows the absorption in visible light band caused by the f→f transition. Pr6O11 shows strong absorption to UV-Vis wavelengths over 320 nm, which is related to the charge transfer between Pr4+ and oxygen ion. Wide band in the fluorescence emission spectrum of Pr2O3 indicates that the lowest energy level of 4f5d orbital of Pr3+ is below 1S0. Fluorescence intensity of Pr6O11 containing Pr4+ decreases 63% compared to that of Pr2O3 at 404 nm, which can be attributed to the energy dissipation between Pr3+and Pr4+. This difference in fluorescence property can be used to analyze Pr valence in ceramics or crystals with high oxygen ion mobility. This research demonstrated that the transformation process and the related property from Pr6O11 to Pr2O3 in different atmosphere may promote the application of Pr2O3.


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    Junyi GU, Wugang FAN, Zhaoquan ZHANG, Qin YAO, Hongquan ZHAN. Structure and Optical Property of Pr2O3 Powder Prepared by Reduction [J]. Journal of Inorganic Materials, 2023, 38(7): 771

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    Paper Information


    Received: Dec. 15, 2022

    Accepted: --

    Published Online: Dec. 28, 2023

    The Author Email: YAO Qin (, ZHAN Hongquan (