ON THE REACTIVITY OF URANOURANIC OXIDE. VI. ON THE CHANGES AMONG URANIUM TRIOXIDE AND THEIR HYDRATES

Journal Article · Sat Apr 01 04:00:00 EST 1961 · J. At. Energy Soc. Japan

DOI:https://doi.org/10.3327/jaesj.3.260· OSTI ID:4054192

Ukazi, R; Minami, F

Using a thermal balance and an x-ray diffractometer, hydration and dehydration are studied for uranium trioxide UO/sub 3/ which is prepared from uranyl nitrate, ammonium diuranate, and uranium peroxide before decomposing to uranouranic oxide. The crystal system of UO/sub 3/ I may be monoclinic, UO/sub 3/ II also may be of a new crystal system, and UO/sub 3/ III is amorphous. These oxides are changed into hydrate by exposing them in air at room temperature for several days or a few months. UO/sub 3/ I converts into monoclinic UO/sub 3/ 2H/ sub 2/O or orthorhombic UO/sub 3/ H/sub 2/O, and UO/sub 3/ II and III both into monoclinic UO/sub 3/ 2H/sub 2/O. Dehydration of UO/sub 3/ 2H/sub 2/O leads through the orthorhombic UO/sub 3/ H/sub 2/O to monoclinic UO/sub 3/ and then to anhydrous amorphous UO/sub 3/. Further, high temperature x-ray study shows that the orthorhombic UO/sub 3/ - H/sub 2/O begins to decompose at 320 deg C, converts into amorphous UO/sub 3/ at 350 deg C and then to anhydrous monoclinic UO/sub 3/ at 415 deg to 420 deg C. (auth)

• Research Organization: Osaka Metal Ind. Co., Yodogawa Works, Japan
• Sponsoring Organization: USDOE
• NSA Number: NSA-15-020708
• OSTI ID: 4054192
• Journal Information: J. At. Energy Soc. Japan, Journal Name: J. At. Energy Soc. Japan Vol. Vol: 3
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

AMMONIUM COMPOUNDS
CHEMISTRY
CONFIGURATION
CRYSTALS
DECOMPOSITION
DIFFRACTION
LATTICES
PREPARATION
REACTIVITY
URANATES
URANIUM OXIDES
URANIUM TRIOXIDE
URANYL NITRATES
X RADIATION