Dr
Manh Duc Le
(Helmholtz Zentrum Berlin für Materialen und Energie)
29/03/2010, 10:45
Strongly correlated behaviours, superconductivity, quantum criticality
poster
We present the resistivity and Hall coefficient of the heavy fermion compound PuPd3 and its solid solution with LuPd3. A simple crystal field model of conduction s-electrons scattering off local f-electron moment was found to describe the low temperature behavior of the resistivity. This model suggests that the s-f exchange interaction as well as the inter f-electron interactions decrease with...
octavian valu
29/03/2010, 10:50
Inorganic, organometallic chemistry
poster
High temperature drop calorimetry for actinide samples
Octavian S. Vălu1,2, Markus Beilmann2, Ondrej Beneš2 and R. J. M. Konings2
1 ”Al. I. Cuza” University, Department of Chemistry, 11 – Carol I Blvd., 700506 – Iaşi, Romania,
e-mail: octavian.valu@yahoo.com
2 European Commission, Joint Research Centre, Institute for Transuranium Elements, Karlsruhe, Germany
Using a Setaram...
Dr
António Pereira Gonçalves
(Instituto Tevnológico e Nuclear)
29/03/2010, 10:55
Materials science, nanomaterials
poster
Considerations on the U-Fe-B ternary system
M. Dias1,2, I.C. Santos1, P.A. Carvalho2, M.Bohn3, O. Tougait4,
H. Noël4, A.P. Gonçalves1
1Dep. Química, Instituto Tecnológico e Nuclear/CFMC-UL, P-2686-953 Sacavém, Portugal
2Dep. Eng. Materiais, Instituto Superior Técnico, Av Rovisco Pais, 1049-001 Lisboa, Portugal
3Departement DRO/Geosciences Marines, Ifremer Centre de Brest, B.P....
Yuriy Verbovytskyy
(Instituto Tecnológico e Nuclear)
29/03/2010, 11:00
Inorganic, organometallic chemistry
poster
Crystallographic study of new phases from the U–Zn–Al ternary system
Yu.V. Verbovytskyy, A.P Gonçalves
Departamento de Química, Instituto Tecnológico e Nuclear/CFMC–UL, 2863–953 Sacavém, Portugal
yuryvv@bigmir.net
Uranium based intermetallic compounds have been intensively studied due to their unusual ground states and behaviours (as intermediate valence states, heavy fermion...
Yurii Skourski
(Hochfeld-Magnetlabor Dresden, FZ Dresden-Rossendorf, D-01314 Dresden, Germany)
29/03/2010, 11:05
Strongly correlated behaviours, superconductivity, quantum criticality
poster
UCo2Si2 belongs to a wide group of UT2X2 compounds, where T is a late d metal and X is Si or Ge. They exhibit a large variety of magnetic states starting from antiferromagnetic (AF) ordering for UCr2Si2, ferrimagnetic (UNi2Si2) and ferromagnetic (F) structures (UCu2Si2) through Pauli paramagnets (UFe2Si2) to compounds, which become superconducting inside an AF state (URu2Si2) [1-3]. UCo2Si2...
Dr
Thomas Scott
(University of Bristol)
29/03/2010, 11:10
Materials science, nanomaterials
poster
Experimental surrogates for Plutonium may provide an effective means to help understand and model some of the many complex metallurgical issues concerning material. Cerium, located in the lanthanide family of the periodic table, is considered to be a non-radioactive surrogate of Pu because of the several similarities between the two metals including similar crystal structures (fcc), multiple...
Mrs
Carmen Ileana Cristache
(IFIN-HH)
29/03/2010, 11:15
Nuclear fuel cycle, environment
poster
Gamma ray spectrometry and ICP-MS methods were investigated in vegetation samples, collected from the surface tailing, near a uranium mine, located in the Baita region , West part of Romania. The main goal of this investigation was to determine distribution of soil-to-plant transfer factors for the natural uranium isotopes and to compare the experimental results obtained between this methods....
Prof.
NICOLAS DACHEUX
(ICSM/LIME)
29/03/2010, 11:20
Nuclear fuel cycle, environment
poster
Considering several properties of interest, Thorium Phosphate-Diphosphate Th4P6O23 (namely beta-TPD) was considered as a promising matrix for the specific immobilization of actinides. Among its interesting properties, one can note its capability to form solid solutions with high actinides mole loadings, its good sintering capability and its high resistance to aqueous corrosion or to radiation...
Mr
Stefano Corradetti
(INFN-LNL)
29/03/2010, 11:25
Materials science, nanomaterials
oral
Materials used in targets for RIBs production have to satisfy several requirements, related to their capability both to produce specific isotopes with high efficiencies and to withstand harsh operating conditions.
Within the SPES group, new carbides with tailored properties are currently studied and developed in order to maximize isotopes production at extreme conditions.
In particular,...
Ms
Anna Maria Adamska
(AGH University of Science and Technology)
29/03/2010, 11:30
Strongly correlated behaviours, superconductivity, quantum criticality
poster
Hydrogenation is a powerful tool capable of changing both crystal structure and magnetic properties of intermetallic compounds. The hydrogen absorption of UTSi compounds (T = Co, Pd, Ni) compounds obtained by direct synthesis from intermetallic precursors at high H2 pressure (pH2 > 100 bar) leads to a notable lattice expansion and an increase of respective magnetic ordering temperatures [1,2]....
Dr
Shadi Yasin
(Hochfeld-Magnetlabor Dresden, Forschungszentrum Dresden-Rossendorf, Germany)
29/03/2010, 11:35
Strongly correlated behaviours, superconductivity, quantum criticality
poster
The Uranium ternary intermetallic material UIrGe belongs to the large family of UTX compounds (T = transition metal and X = Si or Ge) and crystallizes in the orthorhombic TiNiSi-type structure (space group Pnma) [1]. Its isoelectronic analogs URhGe and UCoGe have recently attracted much attention due to exotic coexistence of ferromagnetism and super-conductivity [2,3]. Previous high-field...
Ms
Margarida Henriques
(Departamento de Química, Instituto Tecnológico e Nuclear/CFMC-UL, 2863-953 Sacavém, Portugal)
29/03/2010, 11:40
Materials science, nanomaterials
poster
Investigations on uranium-based ternary intermetallics continue to reveal new phases, with specific structures and rich variety of ground-state properties. In the U-Fe-Ge system the previously reported ternary intermetallic compounds were UFeGe (P21/m, type UFeGe below 500K, and Pnma, type TiNiSi above 500K) [1], UFe2Ge2 (I4/mmm, type ThCr2Si2) [2], UFe6Ge6 (P6/mmm, type YbCo6Ge6) [3], and the...
Alexander Andreev
(Institute of Physics AVCR, Prague)
29/03/2010, 11:45
Strongly correlated behaviours, superconductivity, quantum criticality
poster
See the andreev_jda10.doc and andreev_jda10.pdf files sent by e-mail.
Mr
Adrian Borhan
(“Al.I. Cuza” University, Faculty of Chemistry, 11 - Carol I Blvd., 700506 - Iaşi, Romania), Mr
Bogdan Apetrachioaiei
(“Al.I. Cuza” University, Faculty of Chemistry, 11 - Carol I Blvd., 700506 - Iaşi, Romania)
29/03/2010, 11:50
Inorganic, organometallic chemistry
poster
The present study is aimed to elucidate the existence of the ceric orthophosphate by synthesis and characterization of ‘Ce3(PO4)4’ and CePO4. The results obtained indicate a mixed valence in both phosphates obtained, corresponding to nonstoichiometric compounds of cerium in an intermediate oxidation state (molar ratios P/Ce of 1.06 to 1.18). Based on the results obtained, the existence of...
Mr
Dan Tiberiu Costin
(CEA)
29/03/2010, 11:55
Nuclear fuel cycle, environment
poster
Actinides silicates, including coffinite (USiO4), and derived mineral phases obtained either by cationic or anionic substitutions have been widely studied from various points of view (chemistry, geology, radioecotoxicology). Even if some recent studies led to a reproducible method of preparation for synthetic coffinite samples, this family of compounds remains poorly described in terms of...
Ms
Raquel Jovaní Abril
(Institute for Transuranium Elements)
29/03/2010, 12:00
Materials science, nanomaterials
poster
High-performance ceramics with nanosized microstructures and functionalized porosities provide the technical base for a large variety of applications in many technologies. This type of microstructure of interest in the nuclear field is due to its appearance at the periphery of Light Water Reactor (LWR) UO2 fuel at high burn-up. As shown in the past, the fuel spontaneously transforms to a...
Dr
Mihaela Gladiola Bragea
(Institute of Public Health Timisoara)
29/03/2010, 12:05
Nuclear fuel cycle, environment
poster
A study is presented on the disequilibrium of uranium isotopes (234U and 238U) in soils and vegetation samples collected near an uranium tailing dump. Factors affecting uptake of uranium by plants, including relationships between these radionuclides in soils and in plants, and the temporal changes of uranium concentrations in different plant species are discussed. The 234U/238U atom ratio can...
Ms
Botoum Hy
(IPN Orsay)
29/03/2010, 12:10
Fission products and Radioactive Ion Beam Yields
poster
The SPIRAL2 fission target must fulfill restrictive specifications to ensure an efficient production of neutron-rich isotope beams. The realization of such a target requires a thorough program to develop the appropriate uranium carbide (UCx) material. In particular, the material should provide a high fission yield and allow a fast release of the fissions products. These requirements can only...
