Extreme multi-valence states in mixed actinide oxides
نویسندگان
چکیده
منابع مشابه
Correlated Small Polaron Transport in Mixed Valence Oxides
The electrical transport properties of mixed fdtes, oxidic superconductors and GMR compounds having ions in mixed valence state are shown to originate fhm the correlated motion of polarons and scattering by the spin disorder. The tramprt e e s of mixed valence compounds exhibit anomalous characteristics. In magnetite, it leads to a orderdisorder transition at 120 K with A-type anomaly in the sp...
متن کاملMolecular cluster theory of chemical bonding in actinide oxides
— The electronic structure of actinide monoxides AcO and dioxides Ac02 , where Ac = Th, U, Np, Pu, Am, Cm and Bk has been studied by molecular cluster methods based on the first-principles one-electron local density theory. Molecular orbitals for nearest neighbour clusters Ac06 and AcOs representative of monoxide and dioxide lattices were obtained using non-relativistic spin-restricted and spin...
متن کاملPositron Spectroscopy of Hydrothermally Grown Actinide Oxides Thesis
In recent years AFIT has built expertise and resources dedicated to the growth and characterization of actinide oxides. The primary purpose of this research was to integrate positron spectroscopy – with which AFIT also has a long history – into this actinide research. The main objectives were to construct a Positron Annihilation Lifetime Spectroscopy system, including a new positron source, and...
متن کاملConfigurational electronic entropy and the phase diagram of mixed-valence oxides: the case of LixFePO4.
We demonstrate that configurational electronic entropy, previously neglected, in ab initio thermodynamics of materials can qualitatively modify the finite-temperature phase stability of mixed-valence oxides. While transformations from low-T ordered or immiscible states are almost always driven by configurational disorder (i.e., random occupation of lattice sites by multiple species), in FePO4-L...
متن کاملMixed valence and superconductivity.
Mixed-valence (MV) systems are referred to here as MV-2 and MV-3 depending on whether two or three consecutive valence states are involved. MV-3 systems range from systems with Hubbard U>>0, corresponding to a single stable, intermediate valence state, and U<<0, corresponding to stable alternating valences differing by two units. Experiments using inelastic neutron scattering or inelastic X-ray...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications Chemistry
سال: 2019
ISSN: 2399-3669
DOI: 10.1038/s42004-019-0161-0