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Showing 1 to 12 of 12 for “"Xenotime"”.

  1. In situ Raman spectroscopy of pressure-induced phase transformations in DyPO₄ and GdxDy(1-x)PO₄

    Musselman, Matthew AnthonyColorado School of Mines. Arthur Lakes Library2017

    Xenotime DyPO4 and GdxDy(1-x)PO4 (x = 0.4, 0.5, 0.6) (tetragonal I41/amd zircon structure) have been studied at ambient temperature under high pressures inside a diamond anvil cell with in situ Raman spectroscopy. The Raman active modes of the xenotime structure were observed at low pressures and …

    colo-mines Repository record

  2. CRYSTAL CHEMISTRY AND PHYSICAL-CHEMICAL BEHAVIOR OF REE-BEARING PHOSPHATES AND ARSENATES: THE CASE STUDY OF MT. CERVANDONE

    PAGLIARO, FRANCESCOUniversità degli Studi di Milano2023

    … [monazite-(Ce), nominally Ce(PO4), and xenotime-(Y), nominally Y(PO4)] and arsenates [gasparite-(Ce), nominally Ce(AsO4), and chernovite-(Y), nominally Y(AsO4)], from the hydrothermal quartz-bearing fissures outcropping at Mt. Cervandone (Lepontine Alps, Piedmont, Italy), have been …

    milano Repository record

  3. Zircon behaviour in low temperature environments

    Hay, Duncan CUniversity of Glasgow2007

    … partly as a result of interactions with xenotime that also forms outgrowths upto 12µm thick on zircon. Xenotime inclusions and zircon-xenotime complexes have been identified within zircon outgrowths using TEM and LV-STEM. Electron transparent foils of the outgrowth were prepared using the …

    glasgow Repository record

  4. Correlations between the Mineralogy and Recovery Behavior of Rare Earth Elements (REEs) in Coal Waste

    Ji, BinVirginia Tech2023

    … REEs (HREE) primarily occurred in zircon and xenotime in these two coal waste samples. Further analyzing the REE content and number of REE-bearing particles, it was confirmed that monazite, xenotime, and crandallite-group minerals were the dominant contributors to the total REE (TREE) contents …

    vt Repository record

  5. Crustal melting in the Himalayan orogen : field, geochemical and geochronological studies in the Everest region, Nepal

    Viskupic, Karen M. (Karen Marie), 1975-Massachusetts Institute of Technology2003

    … measurement of REE and Y in monazites and xenotimes, that were later dissolved and dated by U-Pb IDTIMS, revealed monazite growth at temperatures appropriate for crustal melting (>650⁰C) between 25.4 and 24.8 Ma, suggesting that anatexis was ongoing at that time. Further constraints were …

    mit Repository record

  6. The Effect of Composition on the High-Pressure Behavior of Rare-Earth Phosphate Minerals

    Heffernan, Karina MayVirginia Tech2016

    … TbPO4, YPO4, and ScPO4, are isostructural with xenotime (I41/amd). Raman spectra are consistent with previous studies and high-pressure spectra showed no phase transitions up to 10 GPa under hydrostatic conditions. The spectra were used to develop Kieffer-type lattice vibrational models to …

    vt Repository record

  7. The controls of radioelement distribution in the Etive and Cairngorm granites: Implications for heat production

    Barritt, Sally D.The Open University1984

    … NE Granite and of apatite + zircon + monazite + xenotime + Nb-Ta-oxides ± thorite ± uraninite in the Main Granite. Minor amounts of uranium reside in secondary sites in hydrothermally altered samples. <br></br><br></br>Modelled surface heat flow anomalies are 5.8 mW m<sup>-2</sup> and 23.0 mW …

    the-open-u Repository record

  8. The thermal and metamorphic evolution of the Northern Highlands Terrane, Scotland

    Mako, Calvin AndrewVirginia Tech2019

    … convergent tectonics. I have used monazite-xenotime thermometry and geochronology, in conjunction with metamorphic petrology and additional accessory phase geochronology, to place constraints on the timing and rates of thermal metamorphism in a variety of structural settings throughout the …

    vt Repository record

  9. Tectonic Transport Directions and Timing of Metamorphism in the southern part of the Northern Highlands Terrane, Scotland

    Davis, Ella FaeVirginia Tech2025

    … ages collected from titanite, monazite, and xenotime indicate that mineral growth occurred during the Knoydartian - late Neoproterozoic (765-638 Ma), the Grampian II (460–437 Ma), and late/post-Scandian events (418–412 Ma). Some of the older Caledonian (Grampian-Scandian) ages are compatible …

    vt Repository record

  10. A Study of Certain Masterpieces of Prose Fiction in the Light of Twentieth Century Criticism of Technique

    Ballard, Emerald GarrettUniversity of Illinois at Urbana-Champaign1939

    uiuc Repository record

  11. New Fluorescence Sensors for Critical Materials

    Payten, Thomas Bede2022

    … and electromagnets) in the minerals monazite, xenotime and zircon is investigated. Upconversion from these natural minerals is also shown and is a mineral discriminator. This thesis demonstrates the potential for Novel Fluorescence to achieve real-time mineral discrimination in four critical …

    adelaide Repository record

  12. Deportment of radionuclides in copper concentrate from Olympic Dam

    Rollog, Mark2019

    … thorianite, euxenite, apatite, fluorite, xenotime, monazite, baryte, anglesite, and Sr- and Ca-rich alunite-series phases. Mechanisms for surface-sequestration of RNs in high surface area minerals such as covellite and molybdenite have been identified, as well as electrokinetic effects …

    adelaide Repository record