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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...

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Related Experiment Video

Updated: May 18, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VO_x

Published on: May 13, 2020

O'3-Na(x)VO2 system: a superstructure for Na(1/2)VO2.

Christophe Didier¹, Marie Guignard, Jacques Darriet

¹CNRS, Université de Bordeaux, ICMCB site de l'ENSCBP-IPB, 87 avenue du Dr. A. Schweitzer, Pessac, F-33608, France.

Inorganic Chemistry

|September 27, 2012

Summary

Sodium-ion battery cycling of Na(x)VO(2) reveals structural transitions. An ordered O'3-Na(1/2)VO(2) structure with vanadium pairing and semiconductor behavior was discovered.

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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

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Last Updated: May 18, 2026

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx

In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VO_x

Published on: May 13, 2020

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model

Published on: May 23, 2018

Area of Science:

Materials Science
Electrochemistry
Solid-State Chemistry

Background:

Sodium-ion batteries (SIBs) are promising energy storage systems.
Lamellar oxides like NaVO(2) are investigated as cathode materials for SIBs.
Understanding the electrochemical and structural behavior of Na(x)VO(2) is crucial for SIB development.

Purpose of the Study:

To investigate the electrochemical cycling and structural transitions of Na(x)VO(2) in sodium batteries.
To characterize the ordered O'3-Na(1/2)VO(2) phase and its physical properties.
To elucidate the relationship between structure, sodium ordering, and vanadium atom pairing.

Main Methods:

Electrochemical cycling of Na(x)VO(2) within the 1/2 ≤ x ≤ 1 range.
In situ X-ray diffraction to observe structural changes during deintercalation.
Structure refinement of electrochemically obtained O'3-Na(1/2)VO(2).
Physical property measurements including magnetic susceptibility.

Main Results:

Electrochemical cycling is reversible between Na(1/2)VO(2) and Na(1)VO(2).
Multiple monophasic and biphasic domains were observed during deintercalation.
A monoclinic distortion of the α-NaFeO(2) structure occurs for 1/2 ≤ x ≤ 2/3.
A novel ordered superstructure, O'3-Na(1/2)VO(2), with sodium/vacancy ordering and V-V pairing was identified.
O'3-Na(1/2)VO(2) exhibits semiconductor behavior and complex magnetic susceptibility.

Conclusions:

The Na(x)VO(2) system exhibits complex structural transitions during sodium deintercalation.
The discovery of the ordered O'3-Na(1/2)VO(2) phase provides new insights into sodium-ion insertion materials.
Vanadium atom pairing in O'3-Na(1/2)VO(2) influences its electronic and magnetic properties, impacting SIB performance.