The low-temperature heat capacity of lanthanide-doped (La, Nd) and americium-doped UO2 samples was measured by calorimetry.
The results showed a strong effect on the antiferromagnetic Cp anomaly as a result of crystal lattice substitution, defects resulting from selfirradiation, and electron interaction. It was found that the substitution of trivalent ions (La3þ, Nd3þ, Am3þ) leads to a split of the λ peak,
for which we hypothesize that the clustering of the trivalent ions with the charge compensator pentavalent U5þ can play a role. The overall
behavior is confirmed by magnetization measurements using SQUID. The observed differences between La3þ, Nd3þ, and Am3þ are attributed to the f –f exchange interaction. 241Am decay causes in addition self-irradiation effects (point defects), and reduces Néel temperature,
peak intensity, and magnetic entropy as a function of decay (accumulated α dose). The observed effects are similar to 238Pu-doped UO2, the
slight differences being attributed to a higher degree of disorder in the Am material.
GRIVEAU Jean-Christophe;
VIGIER Jean-Francois;
POPA Karin;
VALU Octavian;
COLINEAU Eric;
KONINGS Rudy;
2022-11-09
AIP PUBLISHING
JRC130203
0021-8979 (online),
https://aip.scitation.org/doi/pdf/10.1063/5.0112674,
https://publications.jrc.ec.europa.eu/repository/handle/JRC130203,
10.1063/5.0112674 (online),
| Name | Country | City | Type |
|---|
This document is only visible at the Commission level.
You are not authorized to publish or distribute it outside the European Commission.
This is a public document. You can share this publication.
Datasets
| ID | Title | Public URL |
|---|
Dataset collections
| ID | Acronym | Title | Public URL |
|---|
Scripts / source codes
| Description | Public URL |
|---|
Additional supporting files
| File name | Description | File type |
|---|