Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 47 for “"Exsolution"”.
-
Excess Volume and Exsolution in Pyrope-Grossular Garnet
… of pressure and temperature stability against exsolution. Two garnet phases Py₉₀Gr₁₀ and Py₄₀Gr₆₀ with wt.% composition ratio 1:1, the expected consolute composition, were heated at 6GPa and different temperatures. XRD measurement results showed that these two garnet phases converged completely …
-
Quantitative monitoring of gas injection, exsolution and dissolution using 4D seismic
… main concern in the monitoring of gas injection, exsolution and dissolution is the exact spatial distribution of the gas volumes in the subsurface. In principle, this concern is addressed by the use of 4D seismic data. However, it is recognised that the seismic response still largely provides a …
-
Combining Experiments and First-Principles Calculations to Understand and Engineer Metal Exsolution in Perovskites
Exsolution processing has emerged as a leading new route to fabricate highly active and stable ceramic-supported metal catalysts for a wide variety of applications, including solid oxide fuel cells, solid oxide electrolyzers, catalytic converters, and chemical/fuel production. In exsolution, metal …
-
Major element diffusion in garnet and the exsolution of majoritic garnet from aluminous enstatite in Earth's Upper Mantle
Majorite is a high pressure polymorph of enstatite with the garnet structure. The amount of enstatite that can be dissolved in garnet as a majorite component increases significantly with pressure, and therefore, majoritic garnet is thought to be a major constituent of the Earth's transition zone. …
-
Engineering Functional Defects in Oxides Using External Stimuli
… phase transformations in functional oxides. Exsolution is a promising synthesis method to fabricate self-assembled nanocomposite via phase decomposition. Since defect formation in the lattice is the elementary step in exsolution, I expect that defect engineering to be the fundamental tuning …
-
Experimental and mathematical modeling of foamy-oil evolution and flow in the primary production and CO₂-based cyclic solvent injection
… studies were conducted to differentiate solvent exsolution (i.e., the solution gas becomes the dispersed gas) and liberation (i.e., the dispersed gas becomes the free gas) processes from the heavy oil-CO2/CH4/C3H8 system in bulk fluids and porous media. Experimentally, two series of …
-
Hydrogen Gas Production and Effects During Remediation Using Nano-scale Zero-valent Iron
… of the potential effects of hydrogen gas (H2) exsolution during nanoscale zero-valent iron (nZVI) groundwater remediation applications. An improved understanding of gas exsolution and its effects can be applied to remediation technologies that produce gas in excess of solubility limits, …
-
Aspects of transformation behaviour in olivines, pyroxenes and titanomagnetites
… of these oxides may be complicated by their exsolution microstructures. TEM of the black veins of the Tenham meteorite, reveals that the minerals have undergone varying degrees of shock. Orthopyroxene has been transformed to its high-density, garnet-structure polymorph, majorite, and olivine …
-
Performance Evaluation of an Enhanced Cyclic Solvent Process (ECSP) for Thin Heavy Oil Reservoirs
… The reaction frequency factor (RFF) for gas exsolution from bubble to gas phase almost shows no influence on the simulated oil recovery. In comparison, the RFFs for gas dissolution and exsolution from oil phase to bubble affect the oil recovery to a larger extent. The injection pressure of …
-
Spatially controlled Fe isotope variations at Torres Del Paine
… fractional crystallization, (3) late stage fluid exsolution and (4) thermal migration. Assimilation of isotopically light country rock would not produce the isotopically heavy Torres del Paine granites. Likewise, experimentally determined equilibrium fractionation factors argue against fractional …
-
A study of the kimberlites, diamonds and associated rocks and minerals from the monastery mine, South Africa. Volume 1: Text
… and clinopyroxene may have been derived by exsolution from high temperature aluminous orthopyroxenes. Minerals in the peridotites and pyroxenites have similar compositions to those from other localities. Two groups of phlogopite composition have been noted. Wehrlitic rocks have phlogopite …
-
Silicate Melt Inclusions in Igneous Petrogenesis
… aqueous fluid inclusions indicates that the exsolution of water from the magma occurred prior to the trapping of melt inclusions in quartz. The lower water concentrations and the absence of aqueous fluid inclusions indicates that the andesite never reached the stage of water exsolution. The …
-
Magmatic evolution of the southern Centinela district, northern Chile: insights from PGE geochemistry and zircon fertility tools
… of sulfide saturation, relative to volatile exsolution, is a key factor controlling the type (Cu or Cu-Au) and fertility of porphyry systems from the southern Centinela District. If a parent magma reaches sulfide saturation before volatile exsolution, an immiscible sulfide melt or solid will …
-
Magmatic evolution of the southern Centinela district, northern Chile: insights from PGE geochemistry and zircon fertility tools
… of sulfide saturation, relative to volatile exsolution, is a key factor controlling the type (Cu or Cu-Au) and fertility of porphyry systems from the southern Centinela District. If a parent magma reaches sulfide saturation before volatile exsolution, an immiscible sulfide melt or solid will …
-
Non-stoichiometry and radiation damage effects in zirconium carbide and layered carbide ceramics for nuclear fuel cladding applications
… The possible creation of vacancies and the exsolution of carbon from within the ZrC structure was further evidenced by an increase in the signal strength of the Raman spectra in the dark regions of the sample with increasing irradiation dose, which implied that the quantity of carbon within …
-
A reconnaissance investigation of chalcopyrite-sphalerite relationships in the Cu-Fe-Zn-S system
… as intimately intergrown phases (interpreted as exsolution or replacement) in major Cu-Zn ore bodies. The investigation employed silica tube-type experiments in the temperature range 800°C to 500°C. Data indicate that solid solubility of ZnS in intermediate solid solution (a high temperature …
-
Measurements of sub-surface bubble populations and the modelling of air-sea gas flux
… evolve through the effects of buoyancy, gas exsolution and dissolution, and the fragmentation and coalescence of bubbles.<br/>A number of experimenters have successfully measured sub-surface bubble clouds using a variety of acoustic and optical techniques, although data over a wider range of …
-
Cratonic eclogite xenoliths - formation and evolution of the subcontinental lithospheric mantle
… Corundum-bearing eclogites often show topotactic exsolution textures hosted in omphacite, consisting of a more calcic garnet ± kyanite/zoisite. Based on Si, Al and Mg diffusion profiles it can be inferred that exsolution was controlled by chemical exchange in an isochemical system. Similarly, an …
-
The volatile contents of melt inclusions and implications for mantle degassing and ocean island evolution
… melting a C-bearing source material to its exsolution into a free fluid phase during crystallization and degassing. In Chapter 2, we explore different experimental, microanalytical, and numerical methods which may be used to estimate the CO2 contents of melt inclusions that contain fluid …
-
A petrographical and mineralogical investigation of the rocks of the Bushveld Igneous Complex in the Tauteshoogte-Roossenekal area of the Eastern Transvaal
… the appropriate temperature and contain numerous exsolution-lamellae of augite. As fractional crystallization of the magma continued, it moved further into the stability field of pigeonite and out of the stability field of hypersthene with the result that the formation of hypersthene by the …
Page 1 of 3