학술논문
Transformation of synthetic U3 O8 into different uranium oxide hydrates
Document Type
Article
Author
Source
Mineralogy and Petrology; April 1990, Vol. 41 Issue: 2-4 p247-255, 9p
Subject
Language
ISSN
09300708; 14381168
Abstract
Summary Referring to the natural formation of secondary uranium minerals, the primary transformation of U3 O8 into schoepite has been investigated. The transformation is realized in a continuous system with O2 , CO2 and H2 O. At 100°C schoepite III, UO3 · zH2 O (z ? 1), is formed (a = 14.12; b = 16.83; c = 15.22 Å) with a density of 4.460 g/cm3 . At 25°C a mixture of schoepite II (UO3 · yH2 O, 1 < y < 2; a = 13.99; b = 16.72; c = 14.73 Å) and schoepite I (UO3 · xH2 O, x ? 2; a = 14.33; b = 16.79; c = 14.73 Å) is obatined. From thermogravimetric analysis the activation energy of dehydration for schoepite III is determined as 49(3) · 103 J/mole.