0000000000347439

AUTHOR

Robin W. Grimes

showing 2 related works from this author

Atomic scale DFT simulations of point defects in uranium nitride

2007

Atomic scale density functional calculations are used to predict the behaviour of defects in uranium mononitride (UN). Two different density functional codes (VASP and CASTEP) were employed with supercells containing from 8 to 250 atoms (providing a significant range of defect concentrations). Schottky and nitrogen Frenkel point defect formation energies, local lattice relaxations and overall lattice parameter change, as well as the defect induced electronic density redistribution, are discussed.

Lattice energychemistry.chemical_compoundLattice constantCondensed matter physicsChemistryKröger–Vink notationSchottky defectCASTEPGeneral Materials ScienceCondensed Matter PhysicsCrystallographic defectUranium nitrideElectronic densityJournal of Physics: Condensed Matter
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Crystal excitation: survey of many-electron Hartree-Fock calculations of self-trapped excitons in insulating crystals

1992

To model successfully the diversity of electronic structure exhibited by excitons in alkali halides and in oxide materials, it is necessary to use a variety or combination of theoretical methods. In this review we restrict our discussion to the results of embedded quantum cluster calculations. By considering the results of such studies, it is possible to recognize the general similarities and differences in detail between the various exciton models in these materials.

CrystalCondensed Matter::Materials ScienceMaterials scienceCondensed matter physicsExcitonCluster (physics)Hartree–Fock methodElectronic structureElectronQuantumExcitationPhilosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences
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