Structural characterization of tellurite glasses doped with transition metal oxides using Raman spectra and ab initio calculations

Many technologically relevant transition metal oxides for advanced energy storage and catalysis feature reduced transition metal (TM) oxides and are often nontrivial to prepare because of the need to control the reducing nature of the atmosphere in which they are synthesized. In this work, we show that an ab initio predictive synthesis strategy can be used to produce multiple gram-scale products of various MgVxOy-type phases (δ-MgV2O5, spinel MgV2O4, and MgVO3) containing V3+ or V4+ relevant for Mg-ion battery cathodes. Characterization of these phases using 25Mg solid-state NMR spectroscopy illustrates the potential of 25Mg NMR for studying reversible magnesiation and local charge distributions. Rotor-Assisted Population Transfer is used as a much needed signal-to-noise enhancement technique. The ab initio guided synthesis approach is seen as a step forward towards a predictive synthesis strategy for targeting specific complex TM oxides with variable oxidation states of technological importance.

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Magneto-Structural Characterization of Metallocene-Bridged Nitronyl Nitroxide Diradicals by X-Ray, Magnetic Measurements, Solid-state NMR Spectroscopy, and Ab Initio Calculations

Chemistry - A European Journal ◽

10.1002/chem.200490048 ◽

2004 ◽

Vol 10 (14) ◽

pp. 3354-3354

Author(s):

Christian Sporer ◽

Henrike Heise ◽

Klaus Wurst ◽

Daniel Ruiz-Molina ◽

Holger Kopacka ◽

...

Keyword(s):

Solid State ◽

Nmr Spectroscopy ◽

Ab Initio Calculations ◽

Ab Initio ◽

Structural Characterization ◽

Solid State Nmr ◽

Magnetic Measurements ◽

Nitronyl Nitroxide ◽

X Ray

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Preparation and Characterization of Several Conducting Transition Metal Oxides

MRS Proceedings ◽

10.1557/proc-156-3 ◽

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.

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