Thermophysical property measurements and ion-implantation studies on CePO4

The high-temperature heat capacity of LnPO4 (Ln=La, Ce, Gd) by drop calorimetry

“…The results for CePO 4 , obtained on two different samples, are in excellent agreement with the drop calorimetric data by Bakker et al [11], but are somewhat lower than the DSC results for the T = (400 to 1370) K range reported by us recently. Like was the case for LaPO 4 the difference stays within the uncertainty of the measurements.…”

“…We also measured the high-temperature heat capacity of CePO 4 up to T = 1370 K by differential scanning calorimetry (DSC), extending the earlier drop calorimetric measurements by Bakker et al [11] in the temperature range 474 K to 934 K, the agreement between these results being reasonable in the overlapping temperature range but leading to significant differences when extrapolated. Subsequent DSC measurements of LaPO 4 also yielded differences with the drop calorimetric data by Tsagareishvili et al [6], suggesting a much flatter heat capacity curve.…”

“…Like was the case for LaPO 4 the difference stays within the uncertainty of the measurements. The following heat capacity equation was obtained by fitting our enthalpy data and those of Bakker et al [11], to which we assign an uncertainty of 1%:…”

The high-temperature behaviour of PuPO4 monazite and some other related compounds

“…The smallest volume expansion coefficient was observed for PuPO 4 , followed by CePO 4 , CaTh(PO 4 ) 2 , and NdPO 4 . The expansion coefficients of CePO 4 are not very different from those reported by Bakker et al [33] calculated from 293 to 1323 K using X-ray diffraction. They found a a = 7.32 Â 10 À6 K À1 , a b = 7.77 Â 10 À6 K À1 , a c = 9.00 Â 10 À6 K À1 and a V = 8.25 Â 10 À6 K À1 , compared to our values, a a = 7.48 Â 10 À6 K À1 , a b = 7.07 Â 10 À6 K À1 , a c = 9.18 Â 10 À6 K À1 and a V = 8.14Á10 À6 K À1 , calculated up to 1303 K. However, the error of their experimental setup (ca.…”

Investigations of Ternary Phase Relations in a CeO2–Gd2O3–ThO2 System

“…[3][4][5] In this manuscript, the ternary phase relation established in CeO 2 -Gd 2 O 3 -ThO 2 system is reported. The inert matrix consists of the following components: an inert matrix component, fissile component, burnable poison, and a fertile component to maintain the neutron economy.…”