Protactinium(V) oxide explained

Protactinium(V) oxide is a chemical compound with the formula Pa₂O₅. When it is reduced with hydrogen, it forms PaO₂. 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]}

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 beenused as high temperature dielectrics (up to 1300 °C) for ceramic capacitors.^[3]

Notes and References

1. Web site: Protactinium.
2. 10.1021/ja01652a011 . 1954 . Sellers . Philip A. . Fried . Sherman . Elson . Robert E. . Zachariasen . W. H. . Journal of the American Chemical Society . 76 . 23 . 5935–5938 . The Preparation of Some Protactinium Compounds and the Metal.
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 (PDF) (3. painos). Dordrecht: Springer. ss. 161–252.