Praseodymium(III) oxide

  Pr3+   O2−
IUPAC name
Praseodymium(III) oxide
Other names
Praseodymium oxide, Praseodymium sesquioxide
ECHA InfoCard 100.031.665 Edit this at Wikidata
EC Number
  • 234-845-3
Molar mass 329.813 g/mol
Appearance light green solid
Density 6.9 g/cm3
Melting point 2,183 °C (3,961 °F; 2,456 K)
Boiling point 3,760 °C (6,800 °F; 4,030 K)[1]
+8994.0·10−6 cm3/mol
Hexagonal, hP5
P-3m1, No. 164
117.4 J•mol−1•K−1[1]
-1809.6 kJ•mol−1
Related compounds
Other anions
Praseodymium(III) chloride
Praseodymium(III) sulfide
Other cations
Neodymium(III) oxide
Promethium(III) oxide
Cerium(III) oxide
Related compounds
Uranium(VI) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Praseodymium(III) oxide, praseodymium oxide or praseodymia is the chemical compound composed of praseodymium and oxygen with the formula Pr2O3. It forms light green hexagonal crystals.[1] Praseodymium(III) oxide crystallizes in the manganese(III) oxide or bixbyite structure.[2]


Praseodymium(III) oxide can be used as a dielectric in combination with silicon.[2] Praseodymium-doped glass, called didymium glass, turns yellow and is used in welding goggles because it blocks infrared radiation. Praseodymium(III) oxide is also used to color glass and ceramics yellow.[3] For coloring ceramics, also the very dark brown mixed-valence compound praseodymium(III,IV) oxide, Pr6O11, is used.


  1. ^ a b c Lide, David R. (1998), Handbook of Chemistry and Physics (87 ed.), Boca Raton, Florida: CRC Press, pp. 478, 523, ISBN 0-8493-0594-2
  2. ^ a b Dabrowski, Jarek; Weber, Eicke R. (2004), Predictive Simulation of Semiconductor Processing, Springer, p. 264, ISBN 978-3-540-20481-7, retrieved 2009-03-18
  3. ^ Krebs, Robert E. (2006), The History and Use of our Earth's Chemical Elements, Greenwood Publishing Group, p. 283, ISBN 978-0-313-33438-2, retrieved 2009-03-18