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Title: In Situ Raman Spectroscopy of Uranyl Peroxide Nanoscale Cage Clusters Under Hydrothermal Conditions

Journal Article · · Dalton Transactions
DOI:https://doi.org/10.1039/C9DT01529A· OSTI ID:1510719
 [1];  [1];  [2];  [1];  [3];  [1];  [1]
  1. Univ. of Notre Dame, Notre Dame, IN (United States)
  2. McGill Univ., Montreal, QC (Canada)
  3. Salem State Univ., Salem, MA (United States)

Aqueous solutions containing the nanoscale uranyl peroxide cage clusters U60, [(UO2)(O2)(OH)]6060-, and U60Ox30, [{(UO2)(O2)}60(C2O4)30]60-, were monitored by in situ Raman spectroscopy during stepwise heating to 180°C. In solutions with U60, clusters persist to 120°C, although conversion of U60 to U24, [(UO2)(O2)(OH)]2424-, occurs above 100°C. U60Ox30 persisted in solutions heated to 150°C, although partial conversion to smaller uranyl peroxide clusters species was observed beginning at 100°C. Upon breakdown of the uranyl peroxide cage clusters, uranium precipitated as a compreignacite-like phase, K2[(UO2)3O2(OH)3]2(H2O)7, and metaschoepite, [(UO2)8O2(OH)12](H2O)10. In this work, the role of the countercations, oxalate bridge, and solution pH are examined in order to better understand the mobility of these species at elevated temperatures.

Research Organization:
Univ. of Notre Dame, IN (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003763
OSTI ID:
1510719
Alternate ID(s):
OSTI ID: 1511506
Journal Information:
Dalton Transactions, Vol. 48, Issue 22; ISSN 1477-9226
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 6 works
Citation information provided by
Web of Science

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