// Workers AI · dad joke modeWhat did Praseodymium(IV) oxide say? "I'm a rare element-ary particle.

Praseodymium dioxide
Names
	IUPAC name Praseodymium(IV) oxide
Identifiers
CAS Number	12036-05-4;
3D model (JSmol)	Interactive image;
ChemSpider	74758 ;
ECHA InfoCard	100.031.658
EC Number	234-838-5;
PubChem CID	82846;
CompTox Dashboard (EPA)	DTXSID0065191 ;
	InChI InChI=1S/2O.Pr Key: BOWRJOSABXTXBI-UHFFFAOYSA-N;
	SMILES O=[Pr]=O;
Properties
Chemical formula	PrO2
Molar mass	172.91
Appearance	Dark brownish crystal
Structure
Crystal structure	Fluorite structure
Space group	Fm3m (No. 225)
Lattice constant	a = 539.3 pm
Formula units (Z)	4
Related compounds
Related compounds	Praseodymium(III) oxide; Praseodymium(III,IV) oxide
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Praseodymium(IV) oxide is an inorganic compound with chemical formula PrO₂.

Production

Praseodymium(IV) oxide can be produced by boiling Pr₆O₁₁ in water or acetic acid:^[1]

Pr₆O₁₁ + 3 H₂O → 4 PrO₂ + 2 Pr(OH)₃

Praseodymium(IV) oxide starts to decompose at 320~360 °C, liberating oxygen.

1 2 Chinese: 《无机化学丛书》.第七卷钪稀土元素. 科学出版社. 1.3.4 氧化态+4的化合物. P_193~195
↑ Kern, Sanford (1964). "Magnetic Susceptibility of Praseodymium Oxides". The Journal of Chemical Physics. 40 (1). AIP Publishing: 208–212. Bibcode:1964JChPh..40..208K. doi:10.1063/1.1724864. ISSN 0021-9606.