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Thursday, May 7, 2020 | History

1 edition of Oxygen Potentials and Defect Chemistry in Nonstoichiometric (U, Pu)O2 found in the catalog.

Oxygen Potentials and Defect Chemistry in Nonstoichiometric (U, Pu)O2

by Masato Kato

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Published by INTECH Open Access Publisher .
Written in English


Edition Notes

En.

The Physical Object
Pagination1 online resource
ID Numbers
Open LibraryOL27089488M
ISBN 109535105124
ISBN 109789535105121
OCLC/WorldCa884221473

InTech. p. The aim of this book is to provide an overview on the importance of stoichiometry in the materials science field. It presents a collection of selected research articles and reviews providing up-to-date information related to stoichiometry at various levels. Being materials. course in defect chemistry at the University of Oslo, thereby being able to adjust and improve it step by step. However, the burdens of taking over the research group has kept me from finishing the book. Furthermore, a textbook on defect chemistry by Kofstad’s close friend and colleague, Donald M. Smyth was published that took away.

Get this from a library! Non-Stoichiometric Compounds: Surfaces, Grain Boundaries and Structural Defects. [J Nowotny; W Weppner] -- The material in this book is based on invited and contributed pa pers presented at the NATO Advanced Research Workshop on INon-stoichio l metric Compounds held in Ringberg Castle, Rottach-Egern. You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them.

3. Defect equilibria interstitial oxygen ions at high oxygen activities. In an intermediate region the oxide will be stoichiometric or close to stoichiometric. Some oxides with the fluorite structure exhibit such a defect structure, e.g. UO2±x. COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle coronavirus.


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Oxygen Potentials and Defect Chemistry in Nonstoichiometric (U, Pu)O2 by Masato Kato Download PDF EPUB FB2

Oxygen Potentials and Defect Chemistry in Nonstoichiometric (U,Pu)O 2 Masato Kato Japan Atomic Energy Agency Japan 1. Introduction Nuclear reactors have been developed to secure stable long-term ener gy supply. Light water reactors (LWRs) have been operated on a commercial basis in many countries.

In LWRs, uranium oxide is used as a fuel. The low-temperature defect chemistry of oxides is considered, characterized by frozen-in interaction with the ambient oxygen and reversibility of internal interactions, in particular the.

Oxygen potentials and defect chemistry in nonstoichiometric (U,Pu)O Kato, Masato Uranium and plutonium mixed oxide (U,Pu)O is substitutional solid solution compound having CaF type fluorite structure, which is used as nuclear fuels.

Oxygen nonstoichiometry of the Ruddlesden–Popper oxide Sr 3 Fe 2 O 7−δ was measured at intermediate temperatures (– K) by coulometric titration and high temperature gravimetry.

The oxygen nonstoichiometric behavior was analyzed using the defect. Defining the chemical potentials of the constituent elements from constitutional defects, we calculate the energetics of the possible point defects in nonstoichiometric Sr2FeMoO6 and find transition-metal-ion antisites and oxygen vacancies to be dominant.

In nonstoichiometric Sr2Fe1+xMo1−xO6 with − ≤ x ≤both FeMo antisites. The basic properties of PuO2−x were reviewed, and the equilibrium defects in PuO2−x were evaluated from the experimental data of the oxygen potential and electrical conductivity as well as the Ab-initio calculation results.

Consistency among various properties was confirmed, and the mechanistic models for thermal property representations were by: 2. The calculation results show that only the nearest neighbor plutonium atoms are affected by the oxygen vacancy.

This agrees with the following picture used in the classical defect chemistry, that is, the oxygen has two electrons provide by plutonium, which are left behind when an oxygen atom is Cited by: 1.

nonstoichiometric nickel oxide are altered by the defect processes, and hence excess oxygen becomes prominent role player in such crystals. By calculating inter atomic potentials, the energies of.

Defect Chemistry of Bulk CeO2; Stoichiometric and Non-stoichiometric Introduction Ceria’s use as an electrolyte in solid oxide fuel cells is a consequence of its uorite structure which permits the oxygen ions to move with relative ease.

From the discus-sion in Chapter 1 it seems an important factor in the e ciency of these devices is theFile Size: KB. From discus­ sions during this meeting it emerged that correct understanding of properties of ceramic materials requires urgent studies on the defect structure of the interface region.

Progress in this direction requires the development of the interface defect chemistry. This is. The material in this book is based on invited and contributed pa­ pers presented at the NATO Advanced Research Workshop on INon-stoichio­ l metric Compounds held in Ringberg Castle, Rottach-Egern (Bavarian Alps), Germany, JulyThe workshop followed previous meetings held in Mogilany,Brand: Springer Netherlands.

Oxygen Nonstoichiometry and Defect Chemistry Modeling of Ce Pr O 2− C. Chatzichristodouloua,b,z and P. Hendriksena aFuel Cells and Solid State Chemistry Division, Risø DTU National Laboratory for Sustainable Energy, DK Roskilde, Denmark bNiels Bohr Institute, University of Copenhagen, DK Copenhagen, Denmark The oxygen nonstoichiometry of Ce.

Review from Ringgold Inc., ProtoView: Characterizing the equilibrium state of non-stoichiometric metal oxides in relation to oxygen pressure, Stoklosa defines the total standard Gibbs energy of the formation of defects at a given deviation from the stoichiometry, and develops a method for determining complete diagrams of concentrations of the point defects which takes into account the minority Author: Andrzej Stokłosa.

structure and defect-related properties of all binary metal oxides. It followed Kofstad's equally well-recognized book "High temperature oxidation of metals" fromlater revised and published under the title "High temperature corrosion" in In the quarter of a century that has passed since the field of defect chemistry.

Non-Stoichiometric Defects The defects discussed so far do not disturb the stoichiometry of the crystalline substance. However, a large number of non-stoichiometric inorganic solids are known which contain the constituent elements in non-stoichiometric ratio due to defects in their crystal structures.

These defects are of two types: (a) Metal Excess Defect and (b) Metal Deficiency. Abstract The defect chemical relationships in various B-site mixed LaCrO 3-based ceramics were investigated by means of high-temperature nonstoichiometric deviation, δ, in (La Sr )(Cr 1-y Ti y)O 3-δ (y=, and ) (LSCT), (La Sr )(Cr Mn )O 3-δ (LSCM) and (La Sr )(Cr Fe )O 3-δ (LSCF) were measured as a function of oxygen partial.

Nonstoichiometric compounds: A critique of current structural views J S ANDERSON potentials of the components are a continuous function of the composition of the solid, systematically and structurally related is, however, relevant to the crystal chemistry of nonstoichiometric compounds.

Although trivial, these definitions are important. This work encompasses the thermodynamic characterization and critical evaluation of Zr 4+ doped ceria, a promising redox material for the two-step solar thermochemical splitting of H 2 O and CO 2 to H 2 and CO.

As a case study, we experimentally examine 5 mol% Zr 4+ doped ceria and present oxygen nonstoichiometry measurements at elevated temperatures ranging from K to K and oxygen Cited by: The oxygen potentials of the oxygen‐deficient fluorite‐type oxide (Am Np )O 2−x were measured by the electrochemical method using a zirconia solid electrolyte.

Coulomb titration has been performed for the sample at K over ≤x≤The oxygen potentials were − and − kJ/mol for x= and at K, by: 5. where G* is the free energy of the theoretically perfect crystal, N D is the number of defects, ΔH D is the enthalpy change per defect, ΔS V is the change in vibrational entropy per defect, and ΔS c (N D) is the change in configurational entropy, which is a function of the number of by: 4.

Oxygen release from oxide-based cathode materials is a key phenomenon for the realization of high performance and highly reliable next-generation batteries, because it can be a trigger for a thermal runaway and closely related to electrochemical performances.

In this study, the mechanism of oxygen release fr Journal of Materials Chemistry A HOT PapersCited by: 2.There are two main point defects in nonstoichiometric compounds namely Frenkel defect and Schottky defect. The Frenkel defect explains a defect in the molecule, where an atom or ion (normally, the cation) leaves its own lattice site vacant and instead occupies a normally vacant site, while the Schottky defect forms when vacancies are created when oppositely charged ions leave their lattice Author: Paras Dubey, Netram Kaurav.Contrary to earlier definitions, modern understanding of non-stoichiometric compounds view them as homogenous, and not mixtures of stoichiometric chemical compounds.

[not verified in body] Since the solids are overall electrically neutral, the defect is compensated by a change in the charge of other atoms in the solid, either by changing their oxidation state, or by replacing them with atoms.