Jump to main content
Jump to site search

Issue 15, 2016

Studies on the crystal structure, magnetic and conductivity properties of titanium oxycarbide solid solution (TiO1−xCx)

Author affiliations

Abstract

Titanium oxides and carbides are often considered as electrode materials in energy conversion and storage devices due to their high potential conductivity and good stability. Titanium monoxide and titanium carbide have structures that can both be described as rocksalt with the same cubic close packed titanium sublattice with oxygen and carbon, respectively, occupying the octahedral interstices; however, the oxide is characterised by extensive defects on both sublattices whilst the carbide is stoichiometric and might be considered as an interstitial metal. Despite the anticipated very different natures of the oxide and carbide sublattices, these two phases actually form a complete solid solution. In the present investigation, we carefully characterise this titanium oxycarbide solid solution, reporting on the crystal structure, magnetic and electronic conduction properties. Titanium oxycarbide powders (TiO1−xCx with x = 0 ≤ x ≤ 1) have been prepared by solid state reactions of TiO and TiC powder under controlled environments at elevated temperatures. X-ray diffraction and pycnometric density measurements illustrate the gradual transition of the crystal structure of titanium oxycarbides from a vacancy containing rock-salt structure of TiO to fully occupied TiC with increase in carbon content in the oxycarbide lattice. The variation of the lattice parameter of the oxycarbide crystal as a function of the carbon content has been found to be non-linear which can be attributed to variations in the level of vacancies present in metal as well as non-metal sub-lattices. The existence of a short-range ordering of anion vacancies in oxycarbide with a nominal composition of TiO0.5C0.5 where half of oxygen of TiO is replaced by carbon has been confirmed by selected-area electron diffraction studies. Low temperature magnetic and conductivity measurements confirm that all oxycarbide compositions are Pauli paramagnetic and good metallic conductors.

Graphical abstract: Studies on the crystal structure, magnetic and conductivity properties of titanium oxycarbide solid solution (TiO1−xCx)

Article information


Submitted
03 Jan 2016
Accepted
15 Mar 2016
First published
15 Mar 2016

J. Mater. Chem. A, 2016,4, 5730-5736
Article type
Paper
Author version available

Studies on the crystal structure, magnetic and conductivity properties of titanium oxycarbide solid solution (TiO1−xCx)

D. N. Miller, A. K. Azad, H. Delpouve, L. Quazuguel, J. Zhou, A. Sinha, P. Wormald and J. T. S. Irvine, J. Mater. Chem. A, 2016, 4, 5730 DOI: 10.1039/C6TA00042H

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Social activity

Search articles by author

Spotlight

Advertisements