Phase Relations and Thermodynamics of Ternary Uranium Oxides

Chemical Thermodynamics of Uranium

Thermodynamics of the Ternary System

The enthalpies of mixing of the liquid mixtures of (NaB0 2 ) 2 + B 2 0 3 , N a 4 P 2 0 7 + (NaP0 3 ) 2 , (NaP0 3 ) 2 + B 2 0 3 and N a 4 P 2 0 7 + (NaB0 2 ) 2 have been measured by liquid -(liquid calorimetry. The results are discussed in terms of tentative structural models of the melts, and in terms of O 2 ion transfers from phosphorus groups to boron groups in (NaP0 3 ) 2 + B 2 0 3 and from ...

Uranium extraction from laboratory-synthesized, uranium-doped hydrous ferric oxides.

The extractability of uranium (U) from synthetic uranium-hydrous ferric oxide (HFO) coprecipitates has been shown to decrease as a function of mineral ripening, consistent with the hypothesis that the ripening process will decrease uranium lability. To evaluate this process, three HFO suspensions were coprecipitated with uranyl (UO2(2+)) and maintained at pH 7.0 +/- 0.1. Uranyl was added to the...

The chemical state of complex uranium oxides

Uranium oxides are fascinating materials not only owing to their technological significance in nuclear fuel applications [1] but also with respect to their dynamical properties [2], valence orbital configuration [3] and elementary excitations [4]. Understanding of the electronic, magnetic and crystal structural properties of uranium dioxide (UO2) was advanced significantly [5,6] after establish...

Ternary relations and relevant semantics

Modus ponens provides the central theme. There are laws, of the form A → C. A logic (or other theory) L collects such laws. Any datum A (or theory T incorporating such data) provides input to the laws of L. The central ternary relation R relates theories L; T and U , where U consists of all of the outputs C got by applying modus ponens to major premises from L and minor premises from T . Underl...