Actinides Calcium Gelation Sol-gel process Transuranium elements Uranium Modified sol-gel method Structural characterizations
Issue Date:
2008
Publisher:
Applied Physics A: Materials Science and Processing
Citation:
Volume: 92, Issue: 3, Page : 715-725
Abstract:
The technological settings of a modified sol-gel method for the preparation of highly fine
homogeneous powder of Ca2CuO3 doped with uranium 238 (x= 0.0-0.05) is presented. The analysis of
structure, purity of phases and the justification for the role of uranium in the given compounds are provided,
together with an almost complete classification of the observed optical phonons by means of Raman, IR
measurements and ab initio calculations. A significant reduction in particle size was achieved by doping, and
a strong correlation between resistivity and doping concentration was observed and explained using the
phonon-assisted electron hopping conduction model. The persistence of a covalent insulation state in all
compounds is an interesting feature of this doping. ?? 2008 Springer-Verlag.
