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Showing 1 to 20 of 392 for “"vacancies"”.
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Thermal vacancies in solid helium-3
… It was found to contain about 0.5% thermal vacancies at melting, essentially independent of molar volume. A single hcp 3He crystal (18.8 cm3;mole) was studied, and was found to have 0.1% thermal vacancies at melting. From the measured vacancy concentrations free energies of formation are …
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Thermal vacancies in HCP helium-4
Activation energies of thermal vacancies have been determined in hcp $\sp4$He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm$\sp3$/mole. Absolute lattice parameters at low …
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Thermal vacancies in hcp helium-4
Activation energies of thermal vacancies have been determined in hcp 4He as a function of molar volume. A sensitive strain gauge was used to measure the temperature dependence of the pressure in twenty crystals between 18.17 and 20.9 cm3/mole. Absolute lattice parameters at low temperatures were …
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Quenching Lattice Vacancies in High Purity Gold
Made available in DSpace on 2015-05-12T17:11:56Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 0013506.PDF: 1382647 bytes, checksum: e9775c647293e2abd31e787eb97a6ca9 (MD5) Previous issue date: 1955
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The Production of Vacancies in Pulsed Gold
Made available in DSpace on 2015-05-12T17:03:36Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6003934.PDF: 2147612 bytes, checksum: 9c548d707597be90b0bb04d239a0ac67 (MD5) Previous issue date: 1960
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Sources and sinks for vacancies in gold
… found that, for the pure Wires, sources for vacancies other than the wire surface or grain boundaries were necessary. A short discussion of the relationship between high temperature generation and low temperature annealing was carried out. Generation from perfect lattice sites was also …
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Vacancies in low-density hcp helium-4 solids
… these excitations are typically identified as vacancies, large discrepancies arise in exactly what their nature and role are in the properties of the solid. At issue here is whether or not the vacancies delocalize and form a band of states at large molar volumes.
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Valuing vacancies : Temporal productive revitalisation of neglected land
Neglected or underutilised spaces in cities have never been as important as they are today as land is consumed by rapid urbanisation. Landscape architects have been transforming these sites into public places, an example being the repurposing of a disused rai l line to create the High Line in New …
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The effect of lattice vacancies on the elastic modulus
The effect of quenched-in vacancies upon the elastic modulus of aluminum ma investigated. Equipment for dynamically measuring the change in elastic modulus was developed for the purpose. It was demonstrated that the presence of lattice vacancies will reduce the elastic modulus. This change in …
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Quenching and annealing of lattice vacancies in pure lead
… eV and the resistivity for one atomic percent vacancies was found to be 2.8+0.1 po-cm. Annealing studies indicated that the vacancy behavior of lead is similar to other face-centered-cubic metals. Two annealing stages are observed. One stage near 170 K is attributed to the migration of vacancy …
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Sources of Thermally Generated Vacancies in Single-Crystal and Polycrystalline Gold
Made available in DSpace on 2014-12-10T17:57:43Z (GMT). No. of bitstreams: 1 6511866.pdf: 2947802 bytes, checksum: aaec510994fdc398c18282999333fb9f (MD5) Previous issue date: 1965
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Sources of thermally generated vacancies in single-crystal and polycrystalline gold
Sources of vacancies play an important role in phenomena such as sintering, the Kirkendall effect, high temperature creep, polygonization and many other diffusion controlled processes. In spite of their importance very little is known about the fundamental properties of vacancy sources. For …
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Oxygen ion conduction in layered intergrowth structures with intrinsic oxygen vacancies
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1994.
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Role of Vacancies and Electrochemical Applications of Facet-Controlled Synthetic Superlattice Nanomaterials
… solar cell (DSSCs) system. Further, since vacancies change the electronic structures of materials, and greatly influence their physical and chemical properties, it is important that the identification and quantification of vacancies’ types be characterized. In this context, types and …
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Contribution of mechanically induced vacancies and interstitials to cyclic creep acceleration, The
Includes bibliographical references (pages 75-76).
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Influence of oxygen vacancies on oxygenate reactions over SnO₂(110) single crystal surfaces
… inequivalent types of oxygen vacancies can be introduced onto SnO0₂ (110) surfaces, and the kinetics of the reactions of Brønsted acids is influenced by the number and type of oxygen vacancies present on each surface. The site requirement for dissociation of Brønsted acids has …
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The Effect of Hydrostatic Pressure on The Anneal of Quenched - in Vacancies in Gold
Made available in DSpace on 2015-05-12T17:12:16Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6003910.PDF: 4137916 bytes, checksum: fe0ba5d93936777054c0a87c624d1eb1 (MD5) Previous issue date: 1960
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