Substitution Effects in Binary Intermetallic Compounds
Author: Sung-Jin Kim
Publisher:
Published: 2007
Total Pages: 255
ISBN-13:
DOWNLOAD EBOOKRead and Download eBook Full
Author: Sung-Jin Kim
Publisher:
Published: 2007
Total Pages: 255
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 2003
Total Pages:
ISBN-13:
DOWNLOAD EBOOKZintl phases with general composition AmEn are formed by complete charge transfer from the electropositive metal A (alkali, alkaline earth, or rare earth) to the post transition metal E. The chemical bonding in such semiconducting phases is characterized by localized bonds and is mostly governed by the valence electron concentration (VEC). Various new ternary compounds of the system Na-Zn-Sn, which are presented in the first part of this work, illustrate this principle. By successive variation of the Zn- and Na-content within Sn-rich Na stannides the obtained phases feature typical structure motifs expected from the adjusted VEC. In contrast to that delocalized electrons are simultaneously present in polar intermetallic phases. The transition between the two classes of intermetallic compounds is fluent and also intimately coupled to other factors, such as packing efficiency, Madelung energy, and the interactions between cations and anions. In this context substitution experiments in alkaline earth bismuthides and stannides were carried out not only by changing the VEC but also by successive substitution of the cations. Stabilizing cation-anion interactions were discovered to be of increased importance in such phases. The interplay between localized and delocalized states in those compounds also hints at the superconductive property, which was confirmed by magnetic measurements. The herein reported compounds, obtained by the substitution approach and the Zintl concept, reflect the many different structure governing factors in Zintl phases and at their border. The characterization involved X-ray diffraction, EDX, thermal analysis, and magnetic measurements. DFT Band structure calculations contributed to the understanding of structure-property relationships which often go beyond the grasp of the Zintl concept.
Author: Thomas F. Fässler
Publisher: Springer
Published: 2011-05-11
Total Pages: 166
ISBN-13: 364221181X
DOWNLOAD EBOOKR. Bruce King: Structure and Bonding in Zintl Ions and Related Main Group Element Clusters Stefanie Gärtner, Nikolaus Korber: Polyanions of Group 14 and Group 15 Elements in Alkali and Alkaline Earth Metal Solid State Compounds and Solvate Structures Bryan Eichhorn, Sanem Kocak: Dynamic Properties of the Group 14 Zintl Ions and Their Derivatives Thomas F. Fässler: Relationships between soluble Zintl anions, ligand-stabilized cage compounds, and intermetalloid clusters of tetrel (Si – Pb) and pentel (P – Bi) elements Gerasimos S. Armatas, Mercouri Kanatzidis: Germanium-Based Porous Semiconductors from Molecular Zintl Anions
Author: N.S. Stoloff
Publisher: Springer Science & Business Media
Published: 2012-12-06
Total Pages: 690
ISBN-13: 1461312159
DOWNLOAD EBOOKThe attractive physical and mechanical properties of ordered intermetallic alloys have been recognized since early in this century. However, periodic attempts to develop intermetallics for structural applications were unsuc cessful, due in major part to the twin handicaps of inadequate low-temper ature ductility or toughness, together with poor elevated-temperature creep strength. The discovery, in 1979, by Aoki and Izumi in Japan that small additions of boron caused a dramatic improvement in the ductility of Ni3Al was a major factor in launching a new wave of fundamental and applied research on intermetallics. Another important factor was the issuance in 1984 of a National Materials Advisory Board reported entitled "Structural Uses for Ductile Ordered Alloys," which identified numerous potential defense-related applications and proposed the launching of a coordinated development program to gather engineering property and processing data. A substantial research effort on titanium aluminides was already underway at the Air Force Materials Laboratory at Wright Patterson Air Force Base in Ohio and, with Air Force support, at several industrial and university laboratories. Smaller programs also were under way at Oak Ridge National Laboratory, under Department of Energy sponsorship. These research efforts were soon augmented in the United States by funding from Department of Defense agencies such as Office of Naval Research and Air Force Office of Scientific Research, and by the National Science Foundation.
Author: J. J. Zuckerman
Publisher: John Wiley & Sons
Published: 2009-09-17
Total Pages: 505
ISBN-13: 0470145374
DOWNLOAD EBOOKFor the first time the discipline of modern inorganic chemistry has been systematized according to a plan constructed by a council of editorial advisors and consultants, among them three Nobel laureates (E.O. Fischer, H. Taube and G. Wilkinson). Rather than producing a collection of unrelated review articles, the series creates a framework which reflects the creative potential of this scientific discipline. Thus, it stimulates future development by identifiying areas which are fruitful for further research. The work is indexed in a unique way by a structured system which maximizes its usefulness to the reader. It augments the organization of the work by providing additional routes of access for specific compounds, reactions and other topics.
Author:
Publisher:
Published: 1976
Total Pages: 680
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher: Elsevier
Published: 2023-11-23
Total Pages: 424
ISBN-13: 0443193754
DOWNLOAD EBOOKHandbook on the Physics and Chemistry of Rare Earths: Including Actinides, Volume 64, the latest release in this continuous series that covers all aspects of rare earth science, including chemistry, life sciences, materials science and physics, presents interesting chapters on a variety of topics, with this release including sections on Structure and properties of Ln2M3Ge5 compounds, Giant magnetocaloric effect materials, Lanthanide-based single-molecule magnets, and Magnetic Refrigeration with Lanthanide-Based Materials. Presents up-to-date overviews and new developments in the field of rare earths, covering both their physics and chemistry Contains individual chapters that are comprehensive and broad, along with critical reviews Provides contributions from highly experienced, invited experts
Author: Igor S. Golovin
Publisher: Materials Research Forum LLC
Published: 2018-04-01
Total Pages: 258
ISBN-13: 1945291656
DOWNLOAD EBOOKDifferent anelastic phenomena are discussed in this book with respect to iron-based binary and ternary alloys and intermetallic compounds of Fe3Me type, where Me are α-stabilizing elements Al, Ga, or Ge. An introduction into anelastic behavior of metallic materials is given, and methods of mechanical spectroscopy and neutron diffraction are introduced for the better understanding of structure-related relaxation and hysteretic phenomena. To characterize structure and phase transitions - both first and second order - in the studied alloys XRD, TEM, SEM, MFM, VSM, PAS, DSC techniques were used. Considerable emphasis is placed on in situ neutron diffraction tests that were performed with the same heating and cooling rates as the internal friction measurements. Different types of mechanical spectroscopy techniques were used to study mainly, but not exclusively, Fe-Al, Fe-Ga and Fe-Ge based alloys: from subresonance “low” frequency forced bending and torsion vibrations (0.00001 to 200 Hz) to “high” frequency resonance (above ~200 Hz) free decay bending vibrations. We discuss (1) thermally activated effects like Snoek-type relaxation, caused by interstitial atom jumps in alloyed ferrite, (2) Zener relaxation, caused by reorientation of pairs of substitute atoms in iron, (3) different transient effects due to phase transitions of the first and second order, and (4) amplitude dependent magneto-mechanical damping; especially with respect to structure, ordering of substitutional solid solution and phase transitions. Special attention is paid to magnetostriction of the alloys - the result of magneto-mechanical elastic coupling.
Author: J. S. Dunning
Publisher:
Published: 1980
Total Pages: 32
ISBN-13:
DOWNLOAD EBOOKAuthor:
Publisher:
Published: 1990
Total Pages: 544
ISBN-13:
DOWNLOAD EBOOK