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Author: Sun Woo Kim Publisher: ISBN: Category : Chemistry Languages : en Pages :
Book Description
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: Sun Woo Kim Publisher: ISBN: Category : Chemistry Languages : en Pages :
Book Description
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: Thanh Thao Tran Publisher: ISBN: Category : Chemistry Languages : en Pages :
Book Description
This dissertation focuses on the synthesis and structure-property relationships of new complex metal fluorides of (i) alkaline-metal lead fluorocarbonates, alkaline-metal magnesium fluorocarbontes and (ii) a reduced niobium oxyfluoride. We have designed new structure building units, PbO6F and PbO6F2, in layered compounds of KPb2(CO3)2F and K2.70Pb5.15(CO3)5F3, that were then developed to three-dimensional noncentrosymmetric RbPbCO3F and CsPbCO3F. Powder second-harmonic generation (SHG) measurements on K2.70Pb5.15(CO3)5F3, RbPbCO3F and CsPbCO3F using 1064 nm radiation revealed SHG efficiencies of approximately 40, 250 and 300 x a-SiO2, respectively. The Mg2+ substitution of the Pb2+ cation in APbCO3F (A = alkaline-metal) resulted in KMgCO3F and RbMgCO3F with unique coordination environments of magnesium, i.e., pentagonal arrangements in the ab-plane. These compounds are second-harmonic generation (SHG) phase-matching at both 1064 nm (120 and 160 x a-SiO2) and 532 nm (0.33 and 0.6 x b-BaB2O4) with short UV cut-off edges, below 200 and 190 nm for KMgCO3F and RbMgCO3F, respectively. These mixed-metal fluorocarbonates were also characterized by infrared spectroscopy, thermogravimetric and differential thermal analysis. In addition, we report a new highly correlated electron system, Nb2O2F3. It is a new low-valent niobium (III/IV) oxyfluoride that features [Nb2X10] units (X = O, F) with short (2.5739(1) Å) Nb-Nb metal-metal bonds. The [Nb2X10] units are connected through shared O/F vertices to form a 3D structure. Nb2O2F3 undergoes a structural transition (below 90 K), from a monoclinic to a triclinic structure, which can be described as a charge ordering or disproportionnation of [Nb2]7+dimers. That resulted in a doubly (2.5000(9) Å) and a singly bonded (2.6560(9) Å) Nb2 dimers. The structural change is associated with unusual field-independent ‘spin-gap-like’ magnetic and electronic phase transition.
Author: Alain Tressaud Publisher: John Wiley & Sons ISBN: 9780470660751 Category : Technology & Engineering Languages : en Pages : 614
Book Description
Functionalized Inorganic Fluorides: Synthesis, Characterization & Properties of Nanostructured Solids covers several classes of nanostructured and functionalized inorganic fluorides, oxide-fluorides, and fluorinated oxides such as silica and alumina. Ranging from powders or glass-ceramics to thin layers and coatings, they have applications as more efficient and less aggressive catalysts, UV absorbers, planar optical waveguides, integrated lasers and optical amplifiers, luminescent materials, anti-reflective coatings and high Tc superconductors. With a focus on new types of solids, such as nanopowders, hybrids, mesoporous fluorides, and intercalation compounds, the book covers new synthesis routes; physical-chemical characterizations - including morphology, structure, spectroscopic and optical behaviour; detailed ab initio investigations and simulations; and -last but not least- potential applications.
Author: Publisher: ISBN: Category : Languages : en Pages : 142
Book Description
High purity KMF[sub 6] and K[sub 2]MF[sub 6] salts (M = Mo, Re, Ru, Os, Ir, Pt) are obtained from reduction hexafluorides. A rhombohedral unit cell is observed for KReF[sub 6]. 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 RuF[sub 4] is determined from X-ray synchrotron and neutron powder data. Unit cells based on theorthorhombic PdF[sub 4] type cell are derived from X-ray powder data for ReF[sub 4] and OsF[sub 4]. Fluoride ion capture from KAgF[sub 4] provides the thermally unstable trifluoride as a bright, red, diamagnetic solid. The structure solution of AgF[sub 3] and redetermination of the AuF[sub 3] structure from X-ray synchrotron and neutron powder data demonstrate that the two are isostnictural. Thermal decomposition product of AgF[sub 3] is the mixed valence compound Ag[sup II]Ag[sub 2][sup III]F[sub 8]. 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 AgF[sup +]BF[sub 4 [sup [minus]]] which crystallizes in a tetragonal unit. AgFAuF[sub 4] has a triclinic unit cell and is isostructural with CuFAuF[sub 4]. AgFAuF[sub 6] has an orthorhombic unit cell and appears to be isostructural with AgFAsF[sub 6]. A second mixed valence silver fluoride, Ag[sup II]Ag[sup III]F[sub 5], is prepared, which magnetic measurements indicate is probably an AgF[sup +] salt. Magnetic data for all of the AgF[sup +] 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 O[sub 2] to O[sub 2][sup +]. Reactions with C[sub 6]F[sub 6] and C[sub 3]F[sub 6] suggest an electron capture mechanism for cationic AG(II) oxidations.
Author: Abraham Clearfield Publisher: Royal Society of Chemistry ISBN: 1849733562 Category : Science Languages : en Pages : 676
Book Description
Metal phosphonate chemistry is a highly interdisciplinary field, as it encompasses several other areas, such as materials chemistry, gas storage, pharmaceutics, corrosion control, classical chemical synthesis, X-ray crystallography, powder diffraction, etc. It has also acquired additional significance due to "Metal-Organic Frameworks", as evidenced by the hundreds of papers published each year. This book fills the gap in the literature by summarising, in a concise way, the latest developments in the field. Metal phosphonate chemistry has seen impressive growth in the last 15-20 years and there is a clear need to systematize and organize all this growth. This unique book accomplishes just that need - edited by two experts, it includes contributions from other experienced researchers and organises, categorises and presents in an attractive way the latest hot topics in metal phosphonate chemistry and related applications. With an extensive bibliography, it is a great reference for academic and industrial researchers as well as students working in the field and will act as a starting point for further exploration of the literature. It is also of great interest to scientists working in the broader area of metal-organic frameworks and their applications.
Author: Pierre Villars Publisher: Walter de Gruyter ISBN: 3110276658 Category : Science Languages : en Pages : 1827
Book Description
By browsing about 10 000 000 scientific articles of over 200 major journals mainly in a 'cover to cover approach' some 200 000 publications were selected. The extracted data is part of the following fundamental material research fields: crystal structures (S), phase diagrams (also called constitution) (C) and the comprehensive field of intrinsic physical properties (P). This work has been done systematically starting with the literature going back to 1900. The above mentioned research field codes (S, C, P) as well as the chemical systems investigated in each publication were included in the present work. The aim of the Inorganic Substances Bibliography is to provide researchers with a comprehensive compilation of all up to now published scientific publications on inorganic systems in only three handy volumes.
Author: Sun Woo Kim
Author: Sun Woo Kim
Author: Thanh Thao Tran
Author: Sandra Ann Reisinger
Author: Alain Tressaud
Author: Richard Eugene Sykora
Author: William Jack Casteel
Author: 
Author: Abraham Clearfield
Author: 
Author: Pierre Villars