Comparison of reactivity based on intercalation and host-lattice reconstruction. Two routes for the conversion of the lamellar solid hydrogen uranyl phosphate to a lamellar hydrate of uranyl phosphate. Technical report
The lamellar solid hydrogen uranyl phosphate can be quantitatively converted to a lamellar hydrate of uranyl phosphate by two routes: an intercalative ion-exchange reaction with aqueous uranium oxide ions and thermal decomposition in an aqueous slurry. An x ray powder pattern of the product can be indexed in tetragonal symmetry with an interlammelar spacing of 11.1 angstrom, expanded from a valve of 8.69 angstrom in hydrogen uranyl phosphate (HUP). Conversion of HUP to UP is accompanied by a drastic diminution in photoluminescence lifetime and intensity. Arrhenius parameters derived from the rates of the intercalation and thermal decomposition reactions indicate that they proceed by quite different mechanisms: the intercalation reaction proceeds with an apparent activation energy, of 12 plus or minus 2 kilocalories/mole and is characterized by a value of 30 plus or minus 2 kilocalories/mole. Samples of UP, obtained by either method, can be converted back to HUP by the action of dilute phosphoric acid in an aqueous slurry at room temperature. Possible mechanisms for these reactions are discussed.
- Research Organization:
- Wisconsin Univ., Madison (USA). Dept. of Chemistry
- OSTI ID:
- 6091574
- Report Number(s):
- AD-A-182965/4/XAB; UWIS/DC/TR-87/3
- Country of Publication:
- United States
- Language:
- English
Similar Records
Intercalation reactions of the neptunyl(VI) dication with hydrogen uranyl phosphate and hydrogen neptunyl phosphate host lattices
Intercalation reactions of the neptunyl(vi) dication with hydrogen uranyl phosphate and hydrogen neptunyl phosphate host lattices. Technical report
Related Subjects
400201* -- Chemical & Physicochemical Properties
ACID PHOSPHATES
ACTINIDE COMPOUNDS
ACTIVATION ENERGY
ARRHENIUS EQUATION
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL REACTIONS
CONVERSION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DECOMPOSITION
DILUTION
DISPERSIONS
ENERGY
EQUATIONS
FLUIDS
HYDRATES
HYDROGEN COMPOUNDS
ION EXCHANGE
IONS
KINETICS
LIQUIDS
LUMINESCENCE
MIXTURES
OXIDES
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
PHOTOLUMINESCENCE
PYROLYSIS
REACTION KINETICS
SLURRIES
SUSPENSIONS
SYMMETRY
THERMOCHEMICAL PROCESSES
URANIUM COMPOUNDS
URANYL COMPOUNDS
URANYL PHOSPHATES