Hydrothermal Synthesis and Characterization of New Transition-metal and F-block Fluorides and Iodates PDF Download

Author: Richard Eugene Sykora
Publisher:
ISBN:
Category : Iodates
Languages : en
Pages : 626

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Author: William Jack Casteel
Publisher:
ISBN:
Category :
Languages : en
Pages : 320

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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 778

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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 142

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High purity KMF6 and K2MF6 salts (M = Mo, Re, Ru, Os, Ir, Pt) are obtained from reduction hexafluorides. A rhombohedral unit cell is observed for KReF6. Fluoride ion capture by Lewis acids from the hexafluorometallate (IV) salts affords high purity tetrafluorides for M = Mo, Re, Ru, Os, and Pd. The structure of RuF4 is determined from X-ray synchrotron and neutron powder data. Unit cells based on theorthorhombic PdF4 type cell are derived from X-ray powder data for ReF4 and OsF4. Fluoride ion capture from KAgF4 provides the thermally unstable trifluoride as a bright, red, diamagnetic solid. The structure solution of AgF3 and redetermination of the AuF3 structure from X-ray synchrotron and neutron powder data demonstrate that the two are isostnictural. Thermal decomposition product of AgF3 is the mixed valence compound Ag{sup II}Ag2{sup III}F. Several new salts containing the (Ag - F){sub n}{sup n+} chain cation are prepared. The first linear (Ag - F){sub n}{sup n+} chain is observed in AgFBF{sub 4 {sup -}} which crystallizes in a tetragonal unit. AgFAuF4 has a triclinic unit cell and is isostructural with CuFAuF4. AgFAuF6 has an orthorhombic unit cell and appears to be isostructural with AgFAsF6. A second mixed valence silver fluoride, Ag{sup II}Ag{sup III}F5, is prepared, which magnetic measurements indicate is probably an AgF salt. Magnetic data for all of the AgF salts exhibit low magnitude, temperature independent paramagnetism characteristic of metallic systems. Cationic AG(II) in acidic AHF solutions is a powerful oxidizer, capable of oxidizing Xe to Xe(II) and O2 to O2+. Reactions with C6F6 and C3F6 suggest an electron capture mechanism for cationic AG(II) oxidations.

Author: Sun Woo Kim
Publisher:
ISBN:
Category : Chemistry
Languages : en
Pages :

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Mixed-metal fluoride materials are of significant interest attributable to their important physical properties such as magnetic frustration, multiferroicity, ferroelectricity, magnetoelectricity, and non-linear optical behavior. Although a variety of synthetic strategies are known, it still remains a challenge to synthesize new mixed metal fluoride materials. The aim of this research was to synthesize new multiferroic mixed metal fluoride materials, especially materials containing mixed valence ion (Fe2+/Fe3+, Mn2+/Mn3+) with geometrical or magnetic frustration and investigate the possibility of electronic ferroelectricity or magnetic ferroelectricity as well as their functional properties. In this dissertation, I report on the hydrothermal syntheses, crystal structures, characterizations, and physical properties, and their structure-property relationships in new mixed-metal fluorides.

Author: Cameron Black
Publisher:
ISBN:
Category : Fluorides
Languages : en
Pages : 0

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Author: Nicholas Francis Stephens
Publisher:
ISBN:
Category : Fluorides
Languages : en
Pages : 464

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Author: American Chemical Society. Committee on Professional Training
Publisher:
ISBN:
Category : Biochemistry
Languages : en
Pages : 1932

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Faculties, publications and doctoral theses in departments or divisions of chemistry, chemical engineering, biochemistry and pharmaceutical and/or medicinal chemistry at universities in the United States and Canada.

Author: Mohanad A. Al-Azzawi
Publisher:
ISBN:
Category : Chemistry, Inorganic
Languages : en
Pages : 182

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There were two primary objectives for this thesis work, both of which are focused on inorganic nitride-fluoride (N-F) chemistry. The first objective was to prepare both previously known and new M2NF compounds in order to further elucidate the crystal chemistry of known phases, as well as to explore synthesis routes for new mixed metal compounds. The synthesis approach in all cases involved first preparing AMF3 (A = NH4+ or K+; M = Cu, Mg, Co) perovskite-type fluorides as precursors. Modifications of known synthesis methods for these compounds led to very pure, dry precursor materials. Doubled cubic Ca2NF crystals prepared from a KCuF3 precursor were analyzed via high resolution X-ray diffraction, from which it was learned that Frenkel defects thought to be present are actually a non-stoichiometric defect. The second goal of this project was to synthesize new mixed metal nitride fluoride materials. Only two such materials have been reported in the literature, and one of these is a fluorine insertion compound. The most significant result from this part of the project was the successful preparation of a CaMgNF phase related to rocksalt, but with quadrupled unit cell parameters due to ordering of cations and anions along the cell edges. This is the first bimetallic nitride-fluoride to be prepared that is a direct analog of an oxide.

Author: Kishor Kumar Sadasivuni
Publisher: Elsevier
ISBN: 0128225866
Category : Technology & Engineering
Languages : en
Pages : 796

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Book Description
MXenes and their Composites: Synthesis, Properties and Potential Applications presents a state of the art overview of the recent developments on the synthesis, functionalization, properties and emerging applications of two-dimensional (2D) MXenes and their composites.The book systematically describes the state-of-the-art knowledge and fundamentals of MXene synthesis, structure, surface chemistry and functionalization. The book also discusses the unique electronic, optical, mechanical and topological properties of MXenes. Besides, this book covers the various emerging applications of MXenes and their composites across different fields such as energy storage and conversion, gas sensing and biosensing, rechargeable lithium and sodium-ion batteries, lithium-sulphur and multivalent batteries, electromagnetic interference shielding, hybrid capacitors and supercapacitors, hydrogen storage, catalysis and photoelectrocatalysis, gas separation and water desalination, environmental remediation and medical and biomedical applications. All these applications have been efficiently discussed in the specific chapters and in each case, the processing of MXene composites has also been discussed.This book will be an excellent reference for scientists and engineers across various disciplines and industries working in the field of highly promising 2D MXenes and their composites. The book will also act as a guide for academic researchers, material scientists, and advanced students in investigating the new applications of 2D MXenes based materials. - Covers fundamentals of technologically important MAX phases, MXene derivatives, MXene synthesis methods, intercalation and delamination strategies, surface functionalization, fundamental characteristics and properties - Demonstrates major application areas of MXenes, including catalytic, energy storage and energy generation, flexible electronics, EMI shielding, sensors and biosensors, medical and biomedical, gas separation and water desalination - Presents a detailed discussion on the processing and performance of various MXenes towards different applications