Relevant bibliographies by topics / Melt crystallization

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Melt crystallization'

Author: Grafiati
Published: 4 June 2021
Last updated: 24 January 2023

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Journal articles on the topic "Melt crystallization"

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Ulrich, Joachim, Jutta Bierwirth, and Sabine Henning. "Solid Layer Melt Crystallization." Separation and Purification Methods 25, no. 1 (January 1996): 1–45. http://dx.doi.org/10.1080/03602549608006625.

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Matsuoka, M. "Morphology control in melt crystallization." Journal of Physics D: Applied Physics 26, no. 8B (August 14, 1993): B149—B155. http://dx.doi.org/10.1088/0022-3727/26/8b/024.

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Shtukenberg, Alexander G., Melissa Tan, Leslie Vogt-Maranto, Eric J. Chan, Wenqian Xu, Jingxiang Yang, Mark E. Tuckerman, Chunhua T. Hu, and Bart Kahr. "Melt Crystallization for Paracetamol Polymorphism." Crystal Growth & Design 19, no. 7 (June 17, 2019): 4070–80. http://dx.doi.org/10.1021/acs.cgd.9b00473.

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Gupta, Rakesh K., and Kim F. Auyeung. "Crystallization in polymer melt spinning." Journal of Applied Polymer Science 34, no. 7 (November 20, 1987): 2469–84. http://dx.doi.org/10.1002/app.1987.070340711.

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Berezhiani, Malkhaz. "Simulation of melt crystallization kinetics." International Journal of Material Forming 4, no. 4 (January 6, 2011): 421–28. http://dx.doi.org/10.1007/s12289-010-1016-5.

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Beierling, T., J. Micovic, P. Lutze, and G. Sadowski. "Using complex layer melt crystallization models for the optimization of hybrid distillation/melt crystallization processes." Chemical Engineering and Processing: Process Intensification 85 (November 2014): 10–23. http://dx.doi.org/10.1016/j.cep.2014.07.011.

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Tseng, Chen-Rui, Shoei-Chin Wu, Jeng-Jue Wu, and Feng-Chih Chang. "Crystallization behavior of syndiotactic polystyrene nanocomposites for melt- and cold-crystallizations." Journal of Applied Polymer Science 86, no. 10 (September 25, 2002): 2492–501. http://dx.doi.org/10.1002/app.11020.

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Marukovich, E. I., and V. Yu Stetsenko. "Thermodynamic metal crystallization basics." Litiyo i Metallurgiya (FOUNDRY PRODUCTION AND METALLURGY), no. 2 (June 9, 2020): 8–11. http://dx.doi.org/10.21122/1683-6065-2020-2-8-11.

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On the basis of thermodynamic calculations it is shown that crystallization of metals is a thermodynamic process, which takes place mainly at constant temperature. The exception is crystallization at very high cooling rates of the metal melt when the released solidification heat is not enough to stabilize the crystallization temperature of the liquid metal. In crystallization, the specific interfacial surface energy of crystals is not a constant value, but is proportional to their dimensions (bend radius).Nanocrystals of crystallizing phases exist in the metal melt steadily. Metal crystallization aggregates nanocrystals and free metal melt atoms into microcrystals. Mechanism of dendritic crystallization of metals is proposed.
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MISHIMA, Naofumi, Rikuo OTA, Takashi WAKASUGI, and Jiro FUKUNAGA. "Crystallization Behavior of Li2O⋅2SiO2 Melt and a Melt Model." Journal of the Ceramic Society of Japan 101, no. 1179 (1993): 1206–9. http://dx.doi.org/10.2109/jcersj.101.1206.

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Panine, P., E. Di Cola, M. Sztucki, and T. Narayanan. "Early stages of polymer melt crystallization." Polymer 49, no. 3 (February 2008): 676–80. http://dx.doi.org/10.1016/j.polymer.2007.12.026.

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Dissertations / Theses on the topic "Melt crystallization"

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Kim, Kwang-Joo. "Impurity distributions in crystalline solid layer in melt crystallization /." Aachen : Shaker, 2002. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=009698552&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Tähti, Tero. "Suspension melt crystallization in tubular and scraped surface heat exchangers." [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=973404914.

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Beierling, Thorsten [Verfasser]. "Separation of isomeric compounds using layer melt crystallization / Thorsten Beierling." München : Verlag Dr. Hut, 2014. http://d-nb.info/1052375669/34.

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Tavichai, Orasa. "Effect of shear on growth rates during polyethylene melt crystallization." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33996.

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During processing, polymers are exposed to complex thermal and deformation fields. Under these conditions, partially crystalline polymers undergo crystallization, which contributes significantly to their ultimate properties. While the thermal effects on polymer crystallization have been studied extensively, there is much less research carried out with regard to the effects of deformation and stress on crystallization kinetics. This is in part due to experimental difficulties in making appropriate measurements. In the present work, the Linkam Shearing Cell, in conjunction with a polarized light microscope, was used to study the effect of shear on the growth kinetics of various linear low-density polyethylene (LLDPE) resins. Simultaneously, an effort was made to evaluate the effect of shear on morphology. The experimental and analytical aspects of the work will be described, and preliminary results will be reported.
The spherulitic growth rate increased under shear compared to that under quiescent conditions. The circular shape morphology of spherulites was obtained under the shear rate range of consideration (0--1 s-1). The effect of molecular structure in terms of co-monomer and branching content on spherulitic growth rate under quiescent and shear condition was observed. Moreover, the effect of temperature on growth rate under quiescent and shear (0.5 s-1) was studied. The modified Lauritzen-Hoffman equation was used to fit experimental data. The diffusion energy barrier under shear condition (0.5 s-1) was estimated and was found to be lower than the diffusion energy barrier under quiescent conditions.
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Seidel, Felix Johannes [Verfasser]. "Additives for faster separation in melt layer crystallization / Felix Johannes Seidel." Halle, 2017. http://d-nb.info/1137509872/34.

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Hengstermann, Axel [Verfasser]. "A new approach to industrial melt crystallization of acrylic acid / Axel Hengstermann." Aachen : Shaker, 2010. http://d-nb.info/1081887257/34.

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Agarwal, Uday S. "Orientation and crystallization in melt-spinning of poly(ethylene terephthalate) based compositions." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/9975.

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Tähti, Tero [Verfasser]. "Suspension Melt Crystallization in Tubular and Scraped Surface Heat Exchangers / Tero Tähti." Aachen : Shaker, 2004. http://d-nb.info/1172613206/34.

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Lüdecke, Uta [Verfasser]. "Fractionation of multi-component fatty acid mixtures by melt crystallization / Uta Lüdecke." Aachen : Shaker, 2004. http://d-nb.info/1170537456/34.

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Descher, Stefan [Verfasser]. "Modeling and simulation of crystallization processes in polymer melt flows / Stefan Descher." Kassel : kassel university press c/o Universität Kassel - Universitätsbibliothek, 2021. http://d-nb.info/1231385715/34.

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Books on the topic "Melt crystallization"

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Melt crystallization technology. Lancaster, Pa: Technomic Pub. Co., 1995.

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Janeschitz-Kriegl, Hermann. Crystallization Modalities in Polymer Melt Processing. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77317-9.

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Janeschitz-Kriegl, Hermann. Crystallization Modalities in Polymer Melt Processing. Vienna: Springer Vienna, 2010. http://dx.doi.org/10.1007/978-3-211-87627-5.

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Bansal, Narottam P. Superconducting Bi.Pb.SrCaCuOx ceramics by rapid melt quenching and glass crystallization. [Washington, DC: National Aeronautics and Space Administration, 1990.

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Bansal, Narottam P. Superconducting Bi.Pb.SrCaCuOx ceramics by rapid melt quenching and glass crystallization. [Washington, DC: National Aeronautics and Space Administration, 1990.

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Glezer, A. M. Nanokristally, zakalennye iz rasplava. Moskva: Fizmatlit, 2012.

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Dressler, Burkhard O. Incipient melt formation and devitrification at the Wanapitei impact structure, Ontario, Canada. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Dressler, Burkhard O. Incipient melt formation and devitrification at the Wanapitei impact structure, Ontario, Canada. [Washington, DC: National Aeronautics and Space Administration, 1997.

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Industrial crystallization of melts. New York: Marcel Dekker, 2005.

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Igneous rocks and processes: A practical guide. Chichester, West Sussex, UK: Wiley-Blackwell, 2010.

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Book chapters on the topic "Melt crystallization"

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Ulrich, Joachim, and Torsten Stelzer. "Melt Crystallization." In Crystallization, 289–304. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527650323.ch15.

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Ulrich, Joachim, and Torsten Stelzer. "Design Examples of Melt Crystallization." In Crystallization, 325–35. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527650323.ch17.

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Leibovich, V. S. "Melt Crystallization Dynamics." In Growth of Crystals, 155–67. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4615-7125-4_9.

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Matsuoka, M. "Melt Suspension Crystallization." In Science and Technology of Crystal Growth, 233–44. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0137-0_18.

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Ulrich, Joachim, and Jutta Bierwirth. "Melt Layer Crystallization." In Science and Technology of Crystal Growth, 245–58. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0137-0_19.

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Bassett, D. C. "Lamellae in Melt-Crystallized Polymers." In Crystallization of Polymers, 107–17. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1950-4_10.

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Wankat, Phillip C. "Crystallization from The Melt." In Rate-Controlled Separations, 160–204. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-010-9724-6_5.

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Wankat, Phillip C. "Crystallization from the Melt." In Rate-Controlled Separations, 160–204. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1342-7_5.

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Hao, Hongxun, and Yan Xiao. "CHAPTER 11. Continuous Melt Crystallization." In The Handbook of Continuous Crystallization, 393–421. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781788013581-00393.

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Di Marco, Gaetano, and Marco Pieruccini. "Lamellar Growth in Melt-Crystallizing Polymers: Some Effect Related to a Nucleating Agent." In Polymer Crystallization, 366–77. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-45851-4_20.

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Conference papers on the topic "Melt crystallization"

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Cho, J., and T. Yeo. "Delayed Melt Crystallization of Cuspidine by Addition of Li2O." In 8th International Congress on the Science and Technology of Steelmaking. AIST, 2022. http://dx.doi.org/10.33313/531/037.

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Birnbaum, Andrew J., Ui-Jin Chung, Xu Huang, Ainissa G. Ramirez, Sean Polvino, and Y. Lawrence Yao. "Melt-mediated laser crystallization of thin film NiTi shape memory alloys." In ICALEO® 2007: 26th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2007. http://dx.doi.org/10.2351/1.5061140.

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MORGIEL, J., L. LITYŃSKA, J. LABAR, and J. DUTKIEWICZ. "CRYSTALLIZATION OF MELT SPUN TiZrNiCu RIBBONS OF NEAR EQUAL ALLOYING ADDITIONS." In Proceedings of the XIX Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702913_0055.

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Kratochvíl, Jaroslav, and Ivan Kelnar. "Non-isothermal crystallization kinetics in melt-drawn PCL/PLA microfibrillar composites." In VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949684.

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Birnbaum, Andrew J., Ui-Jin Chung, Xu Huang, Ainissa G. Ramirez, James S. Im, and Y. Lawrence Yao. "Pre-heated substrate effects on melt-mediated laser crystallization of niti thin films." In ICALEO® 2008: 27th International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing. Laser Institute of America, 2008. http://dx.doi.org/10.2351/1.5061394.

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Abuibaid, Ahmed Z. A., and Muhammad Z. Iqbal. "Isothermal Melt Crystallization of Polyethylene Nanocomposites With Thermally Reduced Graphene and Carbon Black." In 2019 Advances in Science and Engineering Technology International Conferences (ASET). IEEE, 2019. http://dx.doi.org/10.1109/icaset.2019.8714404.

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Rao, I. J. "Simulation of the Film Blowing Process Using a Continuum Model for Crystallization in Polymers." In ASME 2000 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/imece2000-1993.

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Abstract In this paper we simulate the film blowing process using a model developed to study crystallization in polymers (see Rao (1999), Rao and Rajagopal (2000b)). The framework was developed to generate mathematical models in a consistent manner that are capable of simulating the crystallization process in polymers. During crystallization the polymer transitions from a fluid like state to a solid like state. This transformation usually takes place while the polymer undergoes simultaneous cooling and deformation, as in film blowing. Specific models are generated by choosing forms for the internal energy, entropy and the rate of dissipation. The second law of thermodynamics along with the assumption of maximization of dissipation is used to determine constitutive forms for the stress tensor and the rate of crystallization. The polymer melt is modeled as a rate type viscoelastic fluid and the crystalline solid polymer is modeled as an anisotropic elastic solid. The mixture region, where in the material transitions from a melt to a semi-crystalline solid, is modeled as a mixture of a viscoelastic fluid and an elastic solid. The anisotropy of the crystalline phase and consequently that of the final solid depends on the deformation in the melt during crystallization, a fact that has been known for a long time and has been exploited in polymer processing. The film blowing process is simulated using a generalized Maxwell model for the melt and an anisotropic elastic solid for the crystalline phase. The results of the simulation agree qualitatively with experimental observations and the methodology described provides a framework in which the film blowing problem can be analyzed.
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Mago, Gaurav, Frank T. Fisher, and Dilhan M. Kalyon. "Effect of Shearing on the Crystallization Behavior of Poly (Butylene Terephthalate) and PBT Nanocomposites." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14585.

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Poly (butylene terephthalate) (PBT) is an engineering thermoplastic polyester with excellent mechanical properties and a fast crystallization rate widely processed via extrusion and injection molding. Such processes require very complex deformation histories, which can influence the ultimate properties of the processed material and parts. For such systems, flow-induced structural changes in the material as a function of processing are of increasing interest in the field of polymer processing. Linear viscoelastic material functions, including the storage and loss moduli and magnitude of complex viscosity, are very sensitive to the structural changes occurring in the polymer melt. This initial study focuses on the shear-induced crystallization of PBT and PBT nanocomposites with multi-walled carbon nanotubes (MWNTs). (Shear-induced crystallization is a subset of the more general flow-induced crystallization behavior which is the long-term goal of this research.) The effects of shear history on the isothermal crystallization behavior of these materials were investigated. Time sweep experiments at constant frequency, temperature and strain amplitude were carried out employing small-amplitude oscillatory shear within a parallel-plate geometry. Samples obtained upon quiescent crystallization suggested that the rate of crystallization and crystallization temperatures were modestly affected by the presence and concentration of the nanotubes, consistent with the findings of the earlier reports. However, the characterized shear-induced crystallization behavior of the nanocomposites presented here indicate more significant changes in the crystallization temperature and the rate of crystallization occur as a result of the incorporation of the carbon nanotubes. The shear-induced crystallization behavior was affected by the deformation rate, temperature, and the concentration of the carbon nanotubes. These findings indicate that shear-induced crystallization of polymer nanocomposites (and in general flowinduced crystallization effects due to arbitrary flow fields in the melt state during processing) should be an integral part of attempts to generate a comprehensive understanding of the development of the microstructural distributions and the coupled ultimate properties of polymer nanocomposites.
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Park, Sun-Mi, and Won Kang Jeong. "Separation of Iodine from HIx mixture in SI Hydrogen Producing Process by Melt Crystallization." In Annual International Conference on Chemistry, Chemical Engineering and Chemical Process. Global Science & Technology Forum (GSTF), 2013. http://dx.doi.org/10.5176/2301-3761_ccecp.33.

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Ginkina, Olga, and Kirill Chernov. "VALIDATION OF NUMERICAL SOLUTION OF THE STEFAN PROBLEM BY THE EXAMPLE OF MELT CRYSTALLIZATION." In Proceedings of CHT-08 ICHMT International Symposium on Advances in Computational Heat Transfer. Connecticut: Begellhouse, 2008. http://dx.doi.org/10.1615/ichmt.2008.cht.800.

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Reports on the topic "Melt crystallization"

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Versey, Joshua R. Fission Product Separation from Pyrochemical Electrolyte by Cold Finger Melt Crystallization. Office of Scientific and Technical Information (OSTI), August 2013. http://dx.doi.org/10.2172/1115610.

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Lang, Maik, Alexandra Navrotsky, Tamilarasan Subramani, Igor Gussev, Olliver Dicks, Kostya Trachenko Trachenko, Joseph Ryan, and Jarrod Crum. The Thermodynamics of Crystallization and Phase-Separation in Melt-Derived Nuclear Waste Forms. Office of Scientific and Technical Information (OSTI), March 2022. http://dx.doi.org/10.2172/1860338.

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Neyedley, K., J. J. Hanley, Z. Zajacz, and M. Fayek. Accessory mineral thermobarometry, trace element chemistry, and stable O isotope systematics, Mooshla Intrusive Complex (MIC), Doyon-Bousquet-LaRonde mining camp, Abitibi greenstone belt, Québec. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328986.

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The Mooshla Intrusive Complex (MIC) is an Archean polyphase magmatic body located in the Doyon-Bousquet-LaRonde (DBL) mining camp of the Abitibi greenstone belt, Québec, that is spatially associated with numerous gold (Au)-rich VMS, epizonal 'intrusion-related' Au-Cu vein systems, and shear zone-hosted (orogenic?) Au deposits. To elucidate the P-T conditions of crystallization, and oxidation state of the MIC magmas, accessory minerals (zircon, rutile, titanite) have been characterized using a variety of analytical techniques (e.g., trace element thermobarometry). The resulting trace element and oxythermobarometric database for accessory minerals in the MIC represents the first examination of such parameters in an Archean magmatic complex in a world-class mineralized district. Mineral thermobarometry yields P-T constraints on accessory mineral crystallization consistent with the expected conditions of tonalite-trondhjemite-granite (TTG) magma genesis, well above peak metamorphic conditions in the DBL camp. Together with textural observations, and mineral trace element data, the P-T estimates reassert that the studied minerals are of magmatic origin and not a product of metamorphism. Oxygen fugacity constraints indicate that while the magmas are relatively oxidizing (as indicated by the presence of magmatic epidote, titanite, and anhydrite), zircon trace element systematics indicate that the magmas were not as oxidized as arc magmas in younger (post-Archean) porphyry environments. The data presented provides first constraints on the depth and other conditions of melt generation and crystallization of the MIC. The P-T estimates and qualitative fO2 constraints have significant implications for the overall model for formation (crystallization, emplacement) of the MIC and potentially related mineral deposits.
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Shi, D., W. Zhong, U. Welp, S. Sengupta, V. R. Todt, G. W. Crabtree, S. Dorris, and U. Balachandran. Initial crystallization and growth in melt processing of large-domain YBa2Cu3Ox for magnetic levitation. Office of Scientific and Technical Information (OSTI), October 1994. http://dx.doi.org/10.2172/10194726.

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Mohammadi, N., D. Corrigan, A. A. Sappin, and N. Rayner. Evidence for a Neoarchean to earliest-Paleoproterozoic mantle metasomatic event prior to formation of the Mesoproterozoic-age Strange Lake REE deposit, Newfoundland and Labrador, and Quebec, Canada. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330866.

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A complete suite of bulk major- and trace-elements measurements combined with macroscopic/microscopic observations and mineralogy guided by scanning electron microscope-energy dispersive spectrometry (SEM-EDS) analyses were applied on Nekuashu (2.55 Ga) and Pelland (2.32 Ga) intrusions in northern Canada, near the Strange Lake rare earth elements (REE) deposit, to evaluate their magmatic evolution and possible relations to the Mesoproterozoic Strange Lake Peralkaline Complex (SLPC). These Neoarchean to earliest-Paleoproterozoic intrusions, part of the Core Zone in southeastern Churchill Province, comprise mainly hypersolvus suites, including hornblendite, gabbro, monzogabbro/monzodiorite, monzonite, syenite/augite-syenite, granodiorite, and mafic diabase/dyke. However, the linkage of the suites and their petrogenesis are poorly understood. Geochemical evidence suggests a combination of 'intra-crustal multi-stage differentiation', mainly controlled by fractional crystallization (to generate mafic to felsic suites), and 'accumulation' (to form hornblendite suite) was involved in the evolution history of this system. Our model proposes that hornblendite and mafic to felsic intrusive rocks of both intrusions share a similar basaltic parent magma, generated from melting of a hydrous metasomatized mantle source that triggered an initial REE and incompatible element enrichment that prepared the ground for the subsequent enrichment in the SLPC. Geochemical signature of the hornblendite suite is consistent with a cumulate origin and its formation during the early stages of the magma evolution, however, the remaining suites were mainly controlled by 'continued fractional crystallization' processes, producing more evolved suites: gabbronorite/hornblende-gabbro ? monzogabbro/monzodiorite ? monzonite ? syenite/augite-syenite. In this proposed model, the hydrous mantle-derived basaltic magma was partly solidified to form the mafic suites (gabbronorite/hornblende-gabbro) by early-stage plagioclase-pyroxene-amphibole fractionation in the deep crust while settling of the early crystallized hornblende (+pyroxene) led to the formation of the hornblendite cumulates. The subsequent fractionation of plagioclase, pyroxene, and amphibole from the residual melt produced the more intermediate suites of monzogabbro/monzodiorite. The evolved magma ascended upward into the shallow crust to form monzonite by K-feldspar fractionation. The residual melt then intruded at shallower depth to form syenite/augite-syenite with abundant microcline crystals. The granodiorite suite was probably generated from lower crustal melts associated with the mafic end members. Later mafic diabase/dykes were likely generated by further partial melting of the same source at depth that were injected into the other suites.
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Brenan, J. M., K. Woods, J. E. Mungall, and R. Weston. Origin of chromitites in the Esker Intrusive Complex, Ring of Fire Intrusive Suite, as revealed by chromite trace element chemistry and simple crystallization models. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328981.

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To better constrain the origin of the chromitites associated with the Esker Intrusive Complex (EIC) of the Ring of Fire Intrusive Suite (RoFIS), a total of 50 chromite-bearing samples from the Black Thor, Big Daddy, Blackbird, and Black Label chromite deposits have been analysed for major and trace elements. The samples represent three textural groups, as defined by the relative abundance of cumulate silicate phases and chromite. To provide deposit-specific partition coefficients for modeling, we also report on the results of laboratory experiments to measure olivine- and chromite-melt partitioning of V and Ga, which are two elements readily detectable in the chromites analysed. Comparison of the Cr/Cr+Al and Fe/Fe+Mg of the EIC chromites and compositions from previous experimental studies indicates overlap in Cr/Cr+Al between the natural samples and experiments done at >1400oC, but significant offset of the natural samples to higher Fe/Fe+Mg. This is interpreted to be the result of subsolidus Fe-Mg exchange between chromite and the silicate matrix. However, little change in Cr/Cr+Al from magmatic values, owing to the lack of an exchangeable reservoir for these elements. A comparison of the composition of the EIC chromites and a subset of samples from other tectonic settings reveals a strong similarity to chromites from the similarly-aged Munro Township komatiites. Partition coefficients for V and Ga are consistent with past results in that both elements are compatible in chromite (DV = 2-4; DGa ~ 3), and incompatible in olivine (DV = 0.01-0.14; DGa ~ 0.02), with values for V increasing with decreasing fO2. Simple fractional crystallization models that use these partition coefficients are developed that monitor the change in element behaviour based on the relative proportions of olivine to chromite in the crystallizing assemblage; from 'normal' cotectic proportions involving predominantly olivine, to chromite-only crystallization. Comparison of models to the natural chromite V-Ga array suggests that the overall positive correlation between these two elements is consistent with chromite formed from a Munro Township-like komatiitic magma crystallizing olivine and chromite in 'normal' cotectic proportions, with no evidence of the strong depletion in these elements expected for chromite-only crystallization. The V-Ga array can be explained if the initial magma responsible for chromite formation is slightly reduced with respect to the FMQ oxygen buffer (~FMQ- 0.5), and has assimilated up to ~20% of wall-rock banded iron formation or granodiorite. Despite the evidence for contamination, results indicate that the EIC chromitites crystallized from 'normal' cotectic proportions of olivine to chromite, and therefore no specific causative link is made between contamination and chromitite formation. Instead, the development of near- monomineralic chromite layers likely involves the preferential removal of olivine relative to chromite by physical segregation during magma flow. As suggested for some other chromitite-forming systems, the specific fluid dynamic regime during magma emplacement may therefore be responsible for crystal sorting and chromite accumulation.
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7

Jacques, I. J., A. J. Anderson, and S. G. Nielsen. The geochemistry of thallium and its isotopes in rare-element pegmatites. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328983.

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The Tl isotopic and trace element composition of K-feldspar, mica, pollucite and pyrite from 13 niobium-yttrium-fluorine (NYF)-type and 14 lithium-cesium-tantalum (LCT)-type rare-element pegmatites was investigated. In general, the epsilon-205Tl values for K-feldspar in NYF- and LCT-type pegmatites increases with increasing magmatic fractionation. Both NYF and LCT pegmatites display a wide range in epsilon-205Tl (-4.25 to 9.41), which complicates attempts to characterize source reservoirs. We suggest 205Tl-enrichment during pegmatite crystallization occurs as Tl partitions between the residual melt and a coexisting aqueous fluid or flux-rich silicate liquid. Preferential association of 205Tl with Cl in the immiscible aqueous fluid may influence the isotopic character of the growing pegmatite minerals. Subsolidus alteration of K-feldspar by aqueous fluids, as indicated by the redistribution of Cs in K-feldspar, resulted in epsilon-205Tl values below the crustal average (-2.0 epsilon-205Tl). Such low epsilon-205Tl values in K-feldspar is attributed to preferential removal and transport of 205Tl by Cl-bearing fluids during dissolution and reprecipitation. The combination of thallium isotope and trace element data may be used to examine late-stage processes related to rare-element mineralization in some pegmatites. High epsilon-205Tl and Ga in late-stage muscovite appears to be a favorable indicator of rare-element enrichment LCT pegmatites and may be a useful exploration vector.
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8

Brow, Richard. PHASE SEPARATION AND CRYSTALLIZATION OF COMPLEX BOROSILICATE MELTS FOR GLASS-CERAMIC WASTE FORMS. Office of Scientific and Technical Information (OSTI), March 2019. http://dx.doi.org/10.2172/1505513.

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