Solubility studies and thermal expansion coefficient of uranium–lanthanum mixed oxide system

Aliovalent Cation Substitution in UO2: Electronic and Local Structures of U1–yLayO2±x Solid Solutions

“…The XRD patterns in the Figure show that the three samples exhibit a single fluorite-type phase which is stable at room temperature, as would be expected from the solubility range and thermodynamical calculations. − The sharpness of the XRD peaks indicates a good homogeneity of the material. As shown in the Table , the lattice parameter increases with the La content.…”

Heat capacity measurements and XPS studies on uranium–lanthanum mixed oxides

“…These solid solutions were prepared by combustion synthesis and characterized by XRD, HPLC and ICP-AES. The preparation, characterization, solubility studies and thermal expansion measurements by high temperature XRD were reported in our previous publication [17]. In the present investigation, heat capacity of (U 1−y La y )O 2±x (y = 0.2, 0.4, 0.6, and 0.8) were measured by DSC in the temperature range 298-800 K, and their high temperature enthalpy increment measurements in the temperature range 800-1800 K by using drop calorimeter.…”

“…As the depth of the information is limited to few nanometers from the surface of the sample, the oxygen to metal ratio obtained from the XPS results is applicable only to few atomic layers from the surface. been discussed in detail in our previous publication [17]. The O/M ratios of the solid solutions were determined by spectrophotometric technique [11] as described below.…”

Synthesis, characterization and thermal expansion measurements on uranium–cerium mixed oxides

“…From the above relations, instantaneous (a i ) and mean (a m ) linear thermal expansion coefficients were computed as explained in our previous study [19]. From the above equations, percentage thermal expansions of CeO 2 and the mixed oxides were computed which are given in Tables 4-8 Thermal expansion ð%Þ ½ðU 0:4 Ce 0:6 ÞO 2 ¼ À0:21145 þ 5:87018  10 À4 T þ 4:00782  10 À7 T 2 ;…”

“…Typical instrument related parameters and description about the heating stage and sample holder were explained in our previous publication [19]. The diffraction patterns of the sample holder made of tantalum was co-recorded along with that of the sample for internal temperature calibration.…”