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Studies on the Electrical Properties of Uranium Oxides II. Non‐stoichiometric U 3 O 8
Author(s) -
Singh N.,
Karkhanavala M. D.
Publication year - 1966
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19660170205
Subject(s) - pellets , electrical resistivity and conductivity , polaron , materials science , sintering , hall effect , stoichiometry , uranium oxide , uranium , porosity , conductivity , activation energy , analytical chemistry (journal) , atmospheric temperature range , mineralogy , chemistry , thermodynamics , composite material , metallurgy , electron , physics , chromatography , quantum mechanics , electrical engineering , engineering
The electrical conductivity σ and Hall coefficient R H are measured over the range 250 to 400 °K on pellets of U 3 O 8 sintered for different periods up to 120 h at 900 °C. The sintering results in a progressive decrease of the O/U ratio from 2.666 to 2.63 accompanied by an increase in the density from 5.62 (“green” density) to 8.08 g/cm 3 . The values of the electrical conductivity are corrected for porosity. With decreasing O/U ratio, the conductivity and Hall mobility increase, while the conductivity activation energy decreases. The results for the highly sintered (96.5% of theoretical density) material of composition UO 2.63 are interpreted on the basis of the hopping of small polarons.