Protactinium(IV) oxide

Protactinium(IV) oxide
Names
IUPAC name
Protactinium(IV) oxide
Identifiers
CAS Number
  • 12036-03-2
3D model (JSmol)
  • Interactive image
CompTox Dashboard (EPA)
  • DTXSID701029533 Edit this at Wikidata
InChI
  • InChI=1S/2O.Pa checkY
    Key: FUMADFKVOBAYPE-UHFFFAOYSA-N checkY
  • O=[Pa]=O
Properties
Chemical formula
 O2Pa
Molar mass 263.034 g·mol−1
Appearance Black crystals
Melting point 2,927 °C (5,301 °F; 3,200 K)[1]
Structure
Crystal structure
 Fluorite (cubic), cF12
Space group
 Fm3m, No. 225
Lattice constant
a = 544.6 pm[1]
Hazards
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability (red): no hazard codeInstability (yellow): no hazard codeSpecial hazard RA: Radioactive. E.g. plutonium
4
Special hazard RA: Radioactive. E.g. plutonium
Related compounds
Other cations
 Thorium(IV) oxide
Uranium(IV) oxide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references
Chemical compound

Protactinium(IV) oxide is a chemical compound with the formula PaO2. The black oxide is formed by reducing Pa2O5 with hydrogen at 1 550 °C. Protactinium(IV) oxide does not dissolve in H2SO4, HNO3, or HCl solutions, but reacts with HF.[2][3]: 195 

As protactinium(IV) oxide, like other protactinium compounds, is radioactive, toxic and very rare, it has no known technological use.

References

  1. ^ a b Christine Guéneau; Alain Chartier; Paul Fossati; Laurent Van Brutzel; Philippe Martin (2020). "Thermodynamic and Thermophysical Properties of the Actinide Oxides". Comprehensive Nuclear Materials 2nd Ed. 7: 111–154. doi:10.1016/B978-0-12-803581-8.11786-2. ISBN 9780081028667. S2CID 261051636.
  2. ^ Sellers, Philip A.; Fried, Sherman; Elson, Robert E.; Zachariasen, W. H. (1954). "The Preparation of Some Protactinium Compounds and the Metal". Journal of the American Chemical Society. 76 (23): 5935. doi:10.1021/ja01652a011.
  3. ^ Boris F. Myasoedov, H. W. Kirby, & Ivan G. Tananaev (2006) Protactinium, Chapter 4 in Morss, Lester R. & Edelstein, Norman M. & Fuger, Jean, (edit.) The Chemistry of the Actinide and Transactinide Elements Archived 2017-08-26 at the Wayback Machine (PDF) (3. painos). Dordrecht: Springer. ss. 161–252.
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Pa(II)
Pa(III)
Pa(IV)
  • PaO2
  • PaCl4
  • PaBr4
  • PaF4
  • PaI4
  • PaOCl2
  • PaC
  • Pa(C8H8)2
Pa(V)
  • Pa2O5
  • PaF5
  • PaCl5
  • PaBr5
  • PaI5
  • PaO2F
  • PaO2Cl
  • PaO2I
  • PaO(NO3)3
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Mixed oxidation states
+1 oxidation state
+2 oxidation state
+3 oxidation state
  • Actinium(III) oxide (Ac2O3)
  • Aluminium oxide (Al2O3)
  • Americium(III) oxide (Am2O3)
  • Antimony trioxide (Sb2O3)
  • Arsenic trioxide (As2O3)
  • Berkelium(III) oxide (Bk2O3)
  • Bismuth(III) oxide (Bi2O3)
  • Boron trioxide (B2O3)
  • Caesium sesquioxide (Cs2O3)
  • Californium(III) oxide (Cf2O3)
  • Cerium(III) oxide (Ce2O3)
  • Chromium(III) oxide (Cr2O3)
  • Cobalt(III) oxide (Co2O3)
  • Dinitrogen trioxide (N2O3)
  • Dysprosium(III) oxide (Dy2O3)
  • Einsteinium(III) oxide (Es2O3)
  • Erbium(III) oxide (Er2O3)
  • Europium(III) oxide (Eu2O3)
  • Gadolinium(III) oxide (Gd2O3)
  • Gallium(III) oxide (Ga2O3)
  • Gold(III) oxide (Au2O3)
  • Holmium(III) oxide (Ho2O3)
  • Indium(III) oxide (In2O3)
  • Iron(III) oxide (Fe2O3)
  • Lanthanum oxide (La2O3)
  • Lutetium(III) oxide (Lu2O3)
  • Manganese(III) oxide (Mn2O3)
  • Neodymium(III) oxide (Nd2O3)
  • Nickel(III) oxide (Ni2O3)
  • Phosphorus trioxide (P4O6)
  • Praseodymium(III) oxide (Pr2O3)
  • Promethium(III) oxide (Pm2O3)
  • Rhodium(III) oxide (Rh2O3)
  • Samarium(III) oxide (Sm2O3)
  • Scandium oxide (Sc2O3)
  • Terbium(III) oxide (Tb2O3)
  • Thallium(III) oxide (Tl2O3)
  • Thulium(III) oxide (Tm2O3)
  • Titanium(III) oxide (Ti2O3)
  • Tungsten(III) oxide (W2O3)
  • Vanadium(III) oxide (V2O3)
  • Ytterbium(III) oxide (Yb2O3)
  • Yttrium(III) oxide (Y2O3)
+4 oxidation state
+5 oxidation state
+6 oxidation state
+7 oxidation state
+8 oxidation state
Related
Oxides are sorted by oxidation state. Category:Oxides


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