Cooperations and Projects

  

Cooperations

Copyright: JARA/JCNS
  • Betrieb des Neutronen-Doppeldiffraktometers HEiDi + POLI zur Nutzung an der Forschungsneutronenquelle Heinz-Maier-Leibnitz FRM II in Garching

 
 
  • Polymerforschung
 
 
  • Festkörperchemie der Actiniden
 
 
 
 

Third Party Funded Projects

Copyright: Bundesministerium für Bildung und Forschung
  • Development and optimization of the high-pressure devices for polarised and non-polarised neutron diffraction and spectroscopy on the beamlines HEiDi, POLI, MIRA, and DNS at the Heinz Maier-Leibnitz Zentrum
 
  Copyright: DFG
  • Mechanisms for multiferroicity in rare-earth orthoferrites: Role of the Dzyaloshinskii-Moriya interaction
 
  Copyright: DFG
  • Exploring oxygen diffusion mechanisms in Pr2NiO4+d under in-situ conditions by neutron scattering: interplay between structure and lattice dynamics
 
  BMBF/AcE Copyright: BMBF/AcE

Fundamental investigations of Actinide immobilisation by incorporation into solid phasEs relevant for final disposal

One of the central tasks of nuclear waste disposal is the immobilisation of actinides (U, Th, etc.) from spent fuel elements. Among others, phosphate ceramics with monazite-type structure are well-suited for immobilisation: They are able to incorporate large amounts of actinides at regular sites of their crystal structures and to bind them there permanently. Natural monazite, with an age of up to 3.2 billion years, contains up to 27 weight-percent by UO2 and ThO2, without showing any significant radiation damage. For this and other reasons, ceramic monazite phases are potential candidates for future disposal strategies.

  Monazite Copyright: IfK Schematic drawing of a monazite-type unit cell viewed parallel to [010].

[Incorporation of trivalent actinides into the monazite-type structure was investigated in the previous project "Conditioning“.]

The aim of the project “AcE” is to understand the incorporation and immobilisation of tetravalent actinides (An) in crystalline solid phases relevant to final disposal (including monazite, pyrochlore, uraninite / zirconia, zircone) at the atomic level. For this purpose, complementary experiments and calculations are carried out to study the average and the local structure of the matrix-material, as well as the direct environment of the incorporated An-species (or their surrogates) on an atomic scale.

 
 

Finished Projects

  • Aufbau und Inbetriebnahme des Einkristalldiffraktometers mit polarisierten Neutronen POLI und Implementierung der Flipping-Ratio-Methode an der heißen Quelle des FRM II
 
  Copyright: Bundesministerium für Bildung und Forschung
  • Aufbau und Inbetriebnahme des Einkristalldiffraktometers mit polarisierten Neutronen POLI und Implementierung der Flipping-Ratio-Methode an der heißen Quelle des FRM II
 
 
  • Verbundprojekt Conditioning: Grundlegende Untersuchungen zur Immobilisierung langlebiger Radionuklide mittels Einbau in endlagerrelevante Keramiken; Teilprojekt E
 
 
  • Verbundprojekt Komponenten für die Polarisationsanalyse: Teilprojekt 2: Einkristalldiffraktometer mit polarisierten Neutronen (POLI) am Strahlkanal SR-9a des FRM II
 
 
  • Entwicklung, Bau, Inbetriebnahme und Einsatz eines Transmissions-Polarisators für das kalte Dreiachsenspektrometer IN12 am Hochflussreaktor des ILL in Grenoble
 
 
  • Globale Optimierung: Strukturbestimmung mittelgroßer Strukturen aus niedrig aufgelösten Pulver-Röntgenbeugungsdaten
 
 
  • Synthese und Charakterisierung keramischer Samarium-Phosphat- und Samarium-Phosphosilicat-Phasen zur Immobilisierung von Actinoiden