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Showing 1 to 20 of 32 for “"Lattice defects"”.
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Computer simulation of lattice defects in Ni₃Al
… estimated potentials were used to study the defects in Ni₃Al. A computer program which uses the conjugate gradient technique to obtain the relaxed structures was used. Atoms in the vicinity of the planar defects on the (111) plane were found to relax in two different oscillation modes namely …
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Phonon Scattering From Substitutional Impurities and Lattice Defects in Silver-Chloride
Made available in DSpace on 2015-05-12T21:41:49Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6910658.PDF: 3384587 bytes, checksum: dadaf091abb753ede9fb3bf70e7363a2 (MD5) Previous issue date: 1968
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Phonon Scattering From Substitutional Impurities and Lattice Defects in Cadmium-Sulfide
Made available in DSpace on 2015-05-12T21:41:50Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6910799.PDF: 2471982 bytes, checksum: d9938384dcc01ec6e7c50c7698e0ae7c (MD5) Previous issue date: 1968
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Phonon scattering from substitutional impurities and lattice defects in cadmium sulfide
… the phonon relaxation time. It i$ suggested that lattice imperfections, in particular dislocations, may cause the low temperature depression of the thermal conductivity. Theoretical studies by Klemens, Carruthers, and Ohashi of phonon scattering by dislocations were compared and the re5lUlts …
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Phonon scattering from substitutional impurities and lattice defects in silver chloride
… scattering by substitutional impurities and lattice defects in silver chloride crystals by means of the thermal conductivity technique. In addition, far infrared absorption measurements were made on some of the doped crystals. The thermal conductivity of silver chloride as a function of the …
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The Kitaev Model on Surfaces with Lattice Defects and of Higher Genus
The quantum phase of a physical system is defined as its ground state. As examples of quantum phases we mention super uids, superconductors, Bose- Einstein condensates and quantum Hall states. Different phases of a system originate from the different ways a systems' constituents can be organised …
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TiO2 and ZnO metal oxides lattice defects driven magnetism and their contribution in discoloring of dyes
… role in modulating ferromagnetic behavior. These defects combination correspond to a g-factor value of > 2.1 depending on each structure. In addition, a novel low field microwave absorption signal was observed resulting from large surface areas due to nanostructuring. Moreover, there is an …
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On the role of lattice defects interactions on strain hardening: A study from discrete dislocation dynamics to crystal plasticity modelling
… plasticity laws informed by DDD. At the scale of lattice defects, a DDD tool enabling simulations on any crystalline structure is developed to model dislocation-dislocation, dislocation-twin and dislocation-particles interactions. The tool is first used to quantify the collective effect and …
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Residual lattice defects in silicon(100) films doped with low-energy positive boron and positive arsenic ions during growth by molecular-beam epitaxy: Variation with ion energy and growth temperature
… of ion-induced and inherent residual lattice defects. Bulk-like PL spectra containing sharp, intense, dopant bound-exciton (BE) peaks were consistently obtained from films grown at the highest temperature and lowest ion energy, and no majority-carrier traps were detected by DLTS. For …
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Structure-Composition Relationships and Their Influence on Long Luminescent Lifetimes in Persistent Luminescent Phosphors
… between the host structure’s bandgap and any lattice defects stemming from anion vacancies, anti-site defects, and co-dopants, e.g., Dy3+, that form electron traps. Research has primarily focused on establishing methods to improve the long luminescent lifetimes of known persistent luminescent …
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Laser spectroscopy of color centers in yttrium aluminum garnet
… care. It is well known by crystal growers that lattice defects in Nd:YAG can stifle laser efficiency, but to date very little has been done to isolate and characterize individual YAG defects. Knowing the spectral characteristics of these defects would make detection of distinct defects in a …
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Non-equilibrium Green's function study of transport in disordered double-layer graphene systems
… makes it imperative to study the effects of lattice vacancies which will inevitably arise during fabrication. Room-temperature performance characteristics for both ideal and disordered bilayer graphene systems are compared in an effort to illustrate the behavior of a Bose-Einstein condensate …
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Compact modeling of neutron damage effects in a bipolar junction transistor
… affects BJT performance primarily by creating lattice defects, which can dramatically increase carrier recombination rate. In turn, the increase in recombination rate degrades the current gain. Two approaches were taken in the development of a compact BJT model that include the effects of …
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Catalysis by transition metal compounds
… forming two-center covalent bonds. The effect of lattice defects on the creation of singly-ionized oxygen ions was examined. A systematic procedure for the study of surface and bulk electronic properties was discussed. The insights gained from this study should be applicable to other transition …
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Effect Of Germanium Doping On Erbium Sensitization In The Erbium Doped Silicon Rich Silica Material System
… suggesting excitation via small clusters or lattice defects. These findings could have significant implications in the further development of group IV sensitized silicon compatible gain media.
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4H silicon carbide particle detectors: study of the defects induced by high energy neutron irradiation
… used for their realization, is caused by lattice defects, like creation of point-like defect, dopant deactivation and dead layer formation and that a crucial aspect for the understanding of the defect kinetics at a microscopic level is the correct identification of the crystal defects in …
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Irradiation induced damage in CANDU spacer material Inconel X-750
… in nickel based superalloys, irradiation induced lattice defects and phase instability in face centered cubic alloys, as well as helium’s effects on cavity formation, dislocation evolution, and phase transformation.
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Sistemi e dispositivi meccanici applicati a processi fisici e chimici
… by the generation, migration, and interaction of lattice defects. Depending on the nature of the powder and of its surroundings, the microstructural refinement can be accompanied by unusual physical and chemical transformations with no thermal counterpart. In the light of this peculiarity, …
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