Innovative SANEX process for trivalent actinides separation from PUREX raffinate

Innovative SANEX process for trivalent actinides separation from PUREX raffinate PDF

Author: Michał Sypuła

Publisher: Forschungszentrum Jülich

Published: 2014-03-27

Total Pages: 229

ISBN-13: 3893369279

DOWNLOAD EBOOK →

Recycling of nuclear spent fuel and reduction of its radiotoxicity by separation of long-lived radionuclides would definitely help to close the nuclear fuel cycle ensuring sustainability of the nuclear energy. Partitioning of the main radiotoxicity contributors followed by their conversion into short-lived radioisotopes is known as partitioning and transmutation strategy. To ensure efficient transmutation of the separated elements (minor actinides) the content of lanthanides in the irradiation targets has to be minimised. This objective can be attained by solvent extraction using highly selective ligands that are able to separate these two groups of elements from each other. The objective of this study was to develop a novel process allowing co-separation of minor actinides and lanthanides from a high active acidic feed solution with subsequent actinide recovery using just one cycle, so-called innovative SANEX process. The conditions of each step of the process were optimised to ensure high actinide separation efficiency. Additionally, screening tests of several novel lipophilic and hydrophilic ligands provided by University of Twente were performed. These tests were aiming in better understanding the influence of the extractant structural modifications onto An(III)/Ln(III) selectivity and complexation properties. ...

A Combinatorial Study of Yttria Stabilized Zirconia as an Electrolyte Candidate for Intermediate Temperature Solid Oxide Fuel Cells

A Combinatorial Study of Yttria Stabilized Zirconia as an Electrolyte Candidate for Intermediate Temperature Solid Oxide Fuel Cells PDF

Author: Natalie Alexandra Becerra

Publisher:

Published: 2012

Total Pages: 83

ISBN-13:

DOWNLOAD EBOOK →

Combinatorial research can have two main uses. The first is to perform cursory measurements of many materials to find a composition whose properties are ideal for some known application. The second function of combinatorial research is to test many materials for ideal values of a particular property in order to learn more about that property and variables that can alter it. This study focused on adequately measuring, modeling and calculating the parameters that affect the ionic conductivity of a particular binary spread of yttria stabilized zirconia. At three separate temperatures, the resulting ionic conductivity vs. composition graphs showed trends similar to those found in the literature for bulk materials, which validate the methods that were developed and optimized in this thesis. Further studies of activation energy and phase structure were performed and produced results that also match data found in the literature. Future work can expand on the methods detailed here and examine other combinations of materials such as zirconia co-doped with yttria and scandia or gadolinium-doped ceria.

Dynamics of Glassy, Crystalline and Liquid Ionic Conductors

Dynamics of Glassy, Crystalline and Liquid Ionic Conductors PDF

Author: Junko Habasaki

Publisher: Springer

Published: 2016-10-19

Total Pages: 614

ISBN-13: 3319423916

DOWNLOAD EBOOK →

This book discusses the physics of the dynamics of ions in various ionically conducting materials, and applications including electrical energy generation and storage. The experimental techniques for measurements and characterization, molecular dynamics simulations, the theories of ion dynamics, and applications are all addressed by the authors, who are experts in their fields. The experimental techniques of measurement and characterization of dynamics of ions in glassy, crystalline, and liquid ionic conductors are introduced with the dual purpose of introducing the reader to the experimental activities of the field, and preparing the reader to understand the physical quantities derived from experiments. These experimental techniques include calorimetry, conductivity relaxation, nuclear magnetic resonance, light scattering, neutron scattering, and others. Methods of molecular dynamics simulations are introduced to teach the reader to utilize the technique for practical applications to specific problems. The results elucidate the dynamics of ions on some issues that are not accessible by experiments. The properties of ion dynamics in glassy, crystalline and liquid ionic conductors brought forth by experiments and simulations are shown to be universal, i.e. independent of physical and chemical structure of the ionic conductor as long as ion-ion interaction is the dominant factor. Moreover these universal properties of ion dynamics are shown to be isomorphic to other complex interacting systems including the large class of glass-forming materials with or without ionic conductivity.By covering the basic concepts, theories/models, experimental techniques and data, molecular dynamics simulations, and relating them together, Dynamics of Glassy, Crystalline and Liquid Ionic Conductors will be of great interest to many in basic and applied research areas from the broad and diverse communities of condensed matter physicists, chemists, materials scientists and engineers. The book also provides the fundamentals for an introduction to the field and it is written in such a way that can be used for teaching courses either at the undergraduate or graduate level in academic institutions.

Fast Ion Transport in Solids

Fast Ion Transport in Solids PDF

Author: B. Scrosati

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 375

ISBN-13: 9401119163

DOWNLOAD EBOOK →

The main motivation for the organization of the Advanced Research Workshop in Belgirate was the promotion of discussions on the most recent issues and the future perspectives in the field of Solid State lonics. The location was chosen on purpose since Belgirate was the place were twenty years ago, also then under the sponsorship of NATO, the very first international meeting on this important and interdisciplinary field took place. That meeting was named "Fast Ion Transport in Solids" and gathered virtually everybody at that time having been active in any aspect of motion of ions in solids. The original Belgirate Meeting made for the first time visible the technological potential related to the phenomenon of the fast ionic transport in solids and, accordingly, the field was given the name "Solid State lonics". This field is now expanded to cover a wide range of technologies which includes chemical sensors for environmental and process control, electrochromic windows, mirrors and displays, fuel cells, high performance rechargeable batteries for stationary applications and electrotraction, chemotronics, semiconductor ionics, water electrolysis cells for hydrogen economy and other applications. The main idea for holding an anniversary meeting was that of discussing the most recent issues and the future perspectives of Solid State lonics just twenty years after it has started at the same location on the lake Maggiore in North Italy.