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Record Nr. |
UNINA9910703778203321 |
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Autore |
Nguyen QuynhGiao N. |
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Titolo |
Experimental and theoretical study of thermodynamics of the reaction of titania and water at high temperatures / / QuynhGiao N. Nguyen [and three others] |
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Pubbl/distr/stampa |
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Cleveland, Ohio : , : National Aeronautics and Space Administration, Glenn Research Center, , October 2014 |
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Descrizione fisica |
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1 online resource (21 pages) : color illustrations |
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Collana |
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Soggetti |
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Thermochemistry |
Titanium oxides |
Enthalpy |
Transpiration |
Gibbs free energy |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Title from title screen (viewed on May 15, 2015). |
"October 2014." |
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Nota di bibliografia |
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Includes bibliographical references (pages 20-21). |
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2. |
Record Nr. |
UNINA9910373948503321 |
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Autore |
Mendive Tapia Eduardo |
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Titolo |
Ab initio Theory of Magnetic Ordering : Electronic Origin of Pair- and Multi-Spin Interactions / / by Eduardo Mendive Tapia |
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Pubbl/distr/stampa |
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Cham : , : Springer International Publishing : , : Imprint : Springer, , 2020 |
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ISBN |
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Edizione |
[1st ed. 2020.] |
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Descrizione fisica |
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1 online resource (XVIII, 131 p. 35 illus., 34 illus. in color.) |
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Collana |
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Springer Theses, Recognizing Outstanding Ph.D. Research, , 2190-5053 |
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Disciplina |
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Soggetti |
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Magnetism |
Magnetic materials |
Mathematical physics |
Phase transformations (Statistical physics) |
Quantum computers |
Spintronics |
Magnetism, Magnetic Materials |
Theoretical, Mathematical and Computational Physics |
Phase Transitions and Multiphase Systems |
Quantum Information Technology, Spintronics |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Nota di contenuto |
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Introduction -- Ab-initio Theory of Electronic Structure -- Disordered Local Moment Theory and Fast Electronic Responses -- Minimisation of the Gibbs Free Energy: Magnetic Phase Diagrams and Caloric Effects -- Pair- and Four- Spin Interactions in the Heavy Rare Earth Elements -- Frustrated Magnetism in Mn-based Antiperovskite Mn3GaN -- Summary and Outlook -- Appendix. |
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Sommario/riassunto |
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Many technological applications exploit a variety of magnetic structures, or magnetic phases, to produce and optimise solid-state functionality. However, most research advances are restricted to a reduced number of phases owing to computational and resource constraints. This thesis presents an ab-initio theory to efficiently describe complex magnetic phases and their temperature-dependent |
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properties. The central assumption is that magnetic phases evolve slowly compared with the underlying electronic structure from which they emerge. By describing how the electronic structure adapts to the type and extent of magnetic order, a theory able to describe multi-spin correlations and their effect on the magnetism at finite temperature is obtained. It is shown that multi-spin correlations are behind the temperature and magnetic field dependence of the diverse magnetism in the heavy rare earth elements. Magnetically frustrated Mn-based materials and the effect of strain are also investigated. These studies demonstrate that the performance of solid-state refrigeration can be enhanced by multi-spin effects. |
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