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|Section2= |Section3= |Section4= |Section7= |Section8= }} Neptunium(IV) oxide, or neptunium dioxide, is a radioactive, olive green cubic crystalline solid with the formula NpO2. It is a common product of plutonium fission, and emits both α- and γ-particles.〔 == Production == Industrially, neptunium dioxide is formed from the precipitation of neptunium(IV) oxalate from a neptunium feed solution with oxalic acid, followed by calcination to neptunium dioxide. The neptunium feed solution (which includes varying oxidation states of neptunium) is reduced to a predominately neptunium(IV) solution via ascorbic acid prior to the addition of oxalic acid. A hydrazine inhibitor is initially added to the neptunium feed solution to protect the neptunium and ascorbic acid from decay. Extrapolated and balanced from "The Production of Neptunium Dioxide" by J. A. Porter〔 Np4+ + Np5+ + Np6+ + HNO3 + C6H8O6 → 3 Np4+ + C6H6O6 + H2 + HNO3 Np4+ + C2O4H2 → Np(C2O4) • 6H2O + 2H− Np(C2O4) • 6H2O + Δ → Np(C2O4) Np(C2O4) + Δ → NpO2 + 2CO2 Neptunium dioxide can also be formed effectively from precipitation of neptunium(IV) peroxide, but the oxalate reduction has been found to be more industrially efficient.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Neptunium(IV) oxide」の詳細全文を読む スポンサード リンク
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