Abstract
Fluorescence spectra of uranyl nitrate hexahydrate, trihydrate, and dihydrate at 77 K were recorded. Those of the hexahydrate and trihydrate were similar but were different from that of the dihydrate. Fluorescence lifetimes of the hexahydrate, trihydrate, and dihydrate at 77 K were observed to be 699, 838 and 499 μs, respectively. The difference between these lifetimes was explained by considering the interaction between the uranyl ion and its adjacent water molecules. Composite hydrates were formed by allowing the dihydrate and trihydrate crystals to absorb water vapor in the atmosphere. These composites contained only hexahydrate in addition to the original hydrate. Fluorescence lifetimes of the composites were determined and analyzed. The fluorescence lifetime of a hexahydrate crystal at temperatures ranging from 115 to 220 K showed drastic changes at about 140 and 205 K. These changes were attributed to structural phase transitions in the crystal.
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