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Showing 1 to 16 of 16 for “"ionic crystals"”.
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Polaron transport in ionic crystals
… effects and magnetoconductivity in a variety of ionic crystals. The conduction bands of seven alkali halides were found to be isotropic with a measuring accuracy of ± 0.5%. Cyclotron resonance of photocarriers was observed at 139 GHz by electron heating effects. Polaron effective masses were …
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Extreme-Ultraviolet Response of Ionic Crystals
Made available in DSpace on 2015-05-12T22:38:57Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 7317638.PDF: 3613087 bytes, checksum: 3522e59fbdec1320abd385f4359a980f (MD5) Previous issue date: 1973
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Extreme ultraviolet response of ionic crystals
The absorption coefficients of rubidium chloride, rubidium bromide and potassium bromide have been determined in the extreme-ultraviolet by means of transmission measurements on thin films. For this purpose an electron storage ring was used as a source of continuum radiation in the range of photon …
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Pressure Effects on Energy Levels of Molecular and Ionic Crystals
Made available in DSpace on 2014-12-05T17:15:43Z (GMT). No. of bitstreams: 1 6402951.pdf: 2846435 bytes, checksum: ccbaa7b27699f9384592210581465451 (MD5) Previous issue date: 1963
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Space charge resulting from imperfections and effects thereof in ionic crystals
… defect distribution is calculated for a pure ionic crystal of the type M+X=. It is shown that the normally assumed state of bulk electrical neutrality is a consequence of the presence of potential fields beneath the surfaces and around edge dislocations. These potential fields~ resulting from …
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Effect of heterovalent impurities co-diffusing with monovalent tracers in ionic crystals
Submitted by William Weathers (weathrs2@illinois.edu) on 2012-04-18T21:19:17Z No. of bitstreams: 1 1974_mitchell.pdf: 4745724 bytes, checksum: aefaa1133b74307888dd3b6473c6d6de (MD5)
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Dynamics of Phonons in Crystals as Studied by Picosecond Coherent Anti-Stokes Raman Spectroscopy
… dynamics of the motions of ions and molecules in crystals are of fundamental interest, but due to the short correlation times of the motions (generally in the picosecond or subpicosecond range) the study of the dynamics is a difficult experimental problem. At the same time, theoretical progress in …
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Construction of first-principles density functional approximations and their applications to materials
… do under expansive strain. Wide-gap insulators, ionic crystals, and layered solids tend to have turning surfaces at equilibrium. Chemical bonds in solids are classified using the turning surface radii of its constituent atoms. Depletion of the charge density, such as near a monovacancy in …
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Sonocrystallization and sonofragmentation
… i.e., sonocrystallization, or break existing crystals, i.e., sonofragmentation in solid-liquid mixtures. The sonofragmentation of ionic and molecular crystals is discussed in Chapters 2 and 3. When ultrasound was applied to slurries of ionic or molecular crystals, crystal breakage occurred not …
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Computational electronic structure studies of novel condensed matter phases
… we conducted on Cu2Se, this time into its superionic properties. The nucleation, kinetics, and correlation of lattice strain to the order-disorder superionic phase transition were explored through a combination of transmission electron microscopy and DFT. The correlation between lattice strain …
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Phonon Dispersion Relations in Chrystals
… work on crystal dynamics. The theory of ionic crystals is particularly well advanced. The Shell Model has been developed by Cochran and others to give excellent agreement with the experimental dispersion relations for the alkali halides (Cowley, Cochran, Brockhouse and Woods 1963). This …
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Purely ionic and molecular orbital modelings of the bonding in mineral crystal structures
… gas (MEG) model has been used to generate ionic model CaCO₃ crystals in the calcite, aragonite, diopside, and perovskite structure types. For calcite and aragonite, the model predicts shorter CO bonds and larger bulk moduli than observed. Modeling of the thermochemistry of CaCO₃ does not …
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Broadband THz time-domain spectroscopy of biomolecules : a comprehensive study of the dielectric properties of biomaterials in the far-infrared
… <br>Some samples such as polar liquids or ionic crystals show very strong absorptions in the far-infrared and are thus not suitable for studies in a transmission <br>THz-TDS-spectrometer. Therefore a new spectrometer in reflection geometry was set up. In Chapter 7 we review the similarities …
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It's Not a SKZCAM! Accurate Surface Chemistry at Low Cost
… framework applicable to a wide range of ionic crystal structures, surface terminations, and adsorption/defect sites. In particular, it leads to small cluster sizes that are amenable for CCSD(T), enabling us to resolve long-standing debates across surface chemistry. For example, we reach …
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The Chemistry and Crystallography of Doped Bixbyite, Braunite and Novel Anion-Deficient Fluorite Oxides
… Principles Determining the Structure of Complex Ionic Crystals containing his now famous 5 rules. Of the bixbyite related structures Cu3TeO6 has possibly received the most attention recently for its magnetic properties. A review of the literature reveals multiple different magnetic structures …