Characterization of Transition-Metal Oxides Promoted with Oxoanions by Means of Test Reactions

2005 ◽  
Vol 44 (6) ◽  
pp. 1716-1721 ◽  
Author(s):  
Viviana M. Benítez ◽  
Juan C. Yori ◽  
Carlos R. Vera ◽  
Carlos L. Pieck ◽  
Javier M. Grau ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Test Reactions

Preparation and Characterization of Several Conducting Transition Metal Oxides

1989 ◽  
Vol 156 ◽  
Author(s):  
Aaron Wold ◽  
Kirby Dwight
Keyword(s):  
Transition Metal ◽  
Single Crystal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Structure Property ◽  
Metallic Behavior ◽  
Structure Property Relationships ◽  
Conduction Bands ◽  
Metal Metal

ABSTRACTThe structure-property relationships of several conducting transition metal oxides, as well as their preparative methods, are presented in this paper. The importance of preparing homogeneous phases with precisely known stoichiometry is emphasized. A comparison is also made of the various techniques used to prepare both polycrystalline and single crystal samples. For transition metal oxides, the metallic properties are discussed either in terms of metal-metal distances which are short enough to result in metallic behavior, or in terms of the formation of a П* conduction band resulting from covalent metal-oxygen interactions. Metallic behavior is observed when the conduction bands are populated with either electrons or holes. The concentration of these carriers can be affected by either cation or anion substitutions. The discussion in this presentation will be limited to the elements Re, Ti, V, Cr, Mo, and Cu.

On the Electroanalytical Characterization of LixCoO2, LixNiO2 and LiMn2O4 (Spinel) Electrodes in Repeated Lithium Intercalation-Deintercalation Processes

1997 ◽  
Vol 496 ◽  
Author(s):  
D. Aurbach ◽  
M. D. Levi ◽  
E. Levi ◽  
B. Markovsky ◽  
G. Salitra ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Failure Mechanisms ◽  
Lithium Intercalation ◽  
Li Ion Batteries ◽  
Fast Scan Cyclic Voltammetry ◽  
Limn2o4 Spinel ◽  
Li Ion

ABSTRACTThis paper reports on electroanalytical studies of the intercalation-deintercalation of lithium into lithiated transition metal oxides which are used as cathodes for Li ion batteries. These include LixCoO2 LixNiO2 and LixMn2O4 spinel. The basic electroanalytical response of these systems in LiAsF6 1M/EC-DMC solutions was obtained from the simultaneous use of slow and fast scan cyclic voltammetry (SSCV), potentiostatic intermittent titration (PITT) (from which D vs. E was calculated), and impedance spectroscopy (EIS). Surface sensitive FTIR spectroscopy and XRD were also used for surface and 3D characterization, respectively. A large and important denominator was found in the electrochemical behavior of lithium intercalation-deintercalation into these transition metal oxides and graphite. The use of the electroanalytical response of these systems as a tool for the study of stabilization and failure mechanisms of these materials as cathodes in rechargeable Li batteries is demonstrated and discussed.

Low Temperature Synthesis of Lamellar Transition Metal Oxides Containing Surfactant Ions

1996 ◽  
Vol 457 ◽  
Author(s):  
Gerald G. Janauer ◽  
Rongji Chen ◽  
Arthur D. Dobley ◽  
Peter Y. Zavalij ◽  
M. Stanley Whittingham
Keyword(s):  
Low Temperature ◽  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Layered Compounds ◽  
Vanadium Compound ◽  
Low Temperature Synthesis ◽  
X Ray ◽  
Mechanisms Of Formation

ABSTRACTRecently there has been much interest in reacting vanadium oxides hydrothermally with cationic surfactants to form novel layered compounds. A series of new transition metal oxides, however, has also been formed at or near room temperature in open containers. Synthesis, characterization, and proposed mechanisms of formation are the focus of this work. Low temperature reactions of vanadium pentoxide and ammonium (DTA) transition metal oxides with long chain amine surfactants, such as dodecyltrimethylammonium bromide yielded interesting new products many of which are layered phases. DTA4H2V10O28•8H2O, a layered highly crystalline phase, is the first such phase for which a single crystal X-ray structure has been determined. The unit cell for this material was found to be triclinic with space group P 1 and dimensions a=9.895(1)Å, b=11.596(1)Å, c=21.924(1)Å, α=95.153(2)°, β=93.778(1)°, and γ= 101.360(1)°. Additionally, we synthesized a dichromate phase and a manganese chloride layered phase, with interlayer spacings of 26.8Å, and 28.7Å respectively. The structure, composition, and synthesis of the vanadium compound are described, as well as the synthesis and preliminary characterization of the new chromium and manganese materials.

scholarly journals Synthesis and characterization of metastable transition metal oxides and oxide nitrides

2017 ◽  
Vol 232 (1-3) ◽  
Author(s):  
Tobias Lüdtke ◽  
Dominik Weber ◽  
Alexander Schmidt ◽  
Alexander Müller ◽  
Christoph Reimann ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Transition Metal Oxides ◽  
Tantalum Oxide ◽  
Synthesis And Characterization ◽  
Phase Pure ◽  
Vanadium Sesquioxide ◽  
Δ Phase ◽  
Metastable Transition

AbstractNew routes to vanadium sesquioxide and tantalum oxide nitride (γ- and δ-phase) are presented. Phase pure V

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