Protactinium(V) oxide

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Protactinium(V) oxide
Protactinium(V) oxide
Names
IUPAC name
Protactinium(V) oxide
Identifiers
3D model (
JSmol
)
  • InChI=1S/5O.2Pa
    Key: LDJMPPCAULZCAH-UHFFFAOYSA-N
  • InChI=1S/10O.4Pa
    Key: YHCILLCTPZINHI-UHFFFAOYSA-N
  • O=[Pa](=O)O[Pa](=O)=O
  • O=[Pa]12O[Pa]3(=O)O[Pa](=O)(O1)O[Pa](=O)(O2)O3
Properties
Pa
2O
5
Molar mass 542.0688 g mol−1
Appearance White, opaque crystals
Structure
cubic
Fm-3m, No. 225
Hazards
Occupational safety and health (OHS/OSH):
Main hazards
 highly toxic, radioactive
GHS labelling:
GHS06: ToxicGHS08: Health hazardGHS09: Environmental hazard
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 4: Very short exposure could cause death or major residual injury. E.g. VX gasFlammability 0: Will not burn. E.g. waterInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazard RA: Radioactive. E.g. plutonium
4
0
0
Special hazard RA: Radioactive. E.g. plutonium
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Protactinium(V) oxide is a chemical compound with the formula

Aristid V. Grosse was first to prepare 2 mg of Pa2O5 in 1927.[1] Pa2O5 does not dissolve in concentrated HNO3, but dissolves in HF and in a HF + H2SO4 mixture and reacts at high temperatures with solid oxides of alkali metal and alkaline earth metals.[2][3]
: 195 

As protactinium(V) oxide, like other protactinium compounds, is

radioactive
, toxic and very rare, it has very limited technological use. Mixed oxides of Nb, Mg, Ga and Mn, doped with 0.005–0.52% Pa2O5, have been used as high temperature dielectrics (up to 1300 °C) for ceramic capacitors.[3]: 189 

References

  1. ^ "Protactinium".
  2. doi:10.1021/ja01652a011
    .
  3. ^ a b 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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