monoklin[1]
C2/c (Nr. 15)Vorlage:Raumgruppe/15[1]
a = 1261 pmb = 1057 pmc = 827 pmβ = 126,16°[1]
Plutoniumtetrafluorid
rotbraune monokline Kristalle[2]
fest
7,1 g·cm−3[2]
1037 °C[3]
−425 ± 8 kcal·mol−1[3]
Plutonium(IV)-fluorid ist eine chemische Verbindung aus den Elementen Plutonium und Fluor. Es hat die Formel PuF4 und gehört zur Stoffklasse der Fluoride. Es unterliegt dem Atomwaffensperrvertrag.
Plutonium(IV)-fluorid entsteht durch Umsetzung von Plutoniumdioxid (PuO2) oder Plutonium(III)-fluorid (PuF3) mit Fluorwasserstoff (HF) im O2-Strom bei 450 bis 600 °C. Der Sauerstoff hat hier den wesentlichen Zweck, eine Reduktion des Produkts durch geringe Mengen Wasserstoff zu vermeiden, die sich zumeist im HF-Gas befinden.[3]
Durch Laserbestrahlung von Plutoniumhexafluorid bei einer Wellenlänge unterhalb von 520 nm erfolgt eine Zersetzung zu Plutonium(V)-fluorid und Fluor; bestrahlt man weiter, so erhält man Plutonium(IV)-fluorid.[5]
Plutonium(IV)-fluorid ist ein rotbrauner kristalliner Feststoff, der bei 1037 °C schmilzt. Es kristallisiert im monoklinen Kristallsystem mit den Gitterparametern a = 1261 pm, b = 1057 pm, c = 827 pm und β = 126,16°.[1]
Einstufungen nach der CLP-Verordnung liegen nicht vor, obwohl die chemische Giftigkeit bekannt ist. Wichtig sind die auf der Radioaktivität beruhenden Gefahren, sofern es sich um eine dafür relevante Stoffmenge handelt.
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