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- W5054819 abstract "Measurements of the electrical conductivity and thermoelectrie pow er of nonstoichiometric uranium dioxide confirm the ionic description of nonstoichiometry in urania-base fluorite structures suggested on the basis of thermodynamic measurements and lattice energy calculations. Nonstoiochiometric urania-base solid solutions appear to be relatixely simple ionic solids containing U/sup 5+/ ions and interstitial O/sup 2-/ ions. The U/sup 4+/, U/sup 5+/ and substitutional cations (Th/sup 4+/, Zr/sup 4+/, Y/sup 3+/) may be considered to be randomly distributed in the cationic lattice. The specific electrical conductance, sigma /sub 0/, of nonstoichiometric uranium dioxide is adequately described by the equation sigma /sub 0/ = (3.8 x 10/sup 6//T) exp (-- 0.30 + 0.03/kT) STAU/sup 5+/! STAU/sup 4+/! where STAU/sup 5+/! an d STAU/sup 4+! are the concentrations of U/sup 5+/ and U/sup 4+ ions, respectively. The thermoelectric power, Q, for nonstoichiometric uranium dioxide is approximately represented by the equation Q = (k/e) ln STAU/sup 4+!/STAU/sup 5+! where k is Boitzmann's constant aid e is the electronic charge. Both equations are consistent with a simple ionic description in which activated electronic transfer occurs between U/sup 4+/ and U/sup 5+/ ions in the lattice. Other properties of uranium dioxide which were measured, such as magnetic susceptibilitymore » and oxygen diffusion, are briefly discussed in the light of the ionic model for UO/sub 2/. (auth)« less" @default.
- W5054819 created "2016-06-24" @default.
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- W5054819 date "1961-03-01" @default.
- W5054819 modified "2023-09-26" @default.
- W5054819 title "THE NATURE OF NONSTOICHIOMETRY IN URANIA-BASE SOLID SOLUTIONS" @default.
- W5054819 hasPublicationYear "1961" @default.
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