Fluorescence properties of uranyl nitrates

被引：48

作者：

Leung, AF ^{[1
]}

Hayashibara, L ^{[1
]}

Spadaro, J ^{[1
]}

机构：

[1] Calif State Univ Long Beach, Dept Phys & Astron, Long Beach, CA 90840 USA

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 1999年 / 60卷 / 03期

关键词：

inorganic compounds; luminescence; phase transitions;

D O I：

10.1016/S0022-3697(98)00294-7

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 mu s, 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. (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：299 / 304

页数：6

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