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Synthesis, structure and properties of the oxychalcogenide series A4O4TiSe4 (A=Sm, Gd, Tb, Dy, Ho, Er and Y)

Tuxworth, A.J.; Evans, J.S.O.

Synthesis, structure and properties of the oxychalcogenide series A4O4TiSe4 (A=Sm, Gd, Tb, Dy, Ho, Er and Y) Thumbnail


Authors

A.J. Tuxworth



Abstract

Seven oxyselenide materials have been synthesised with composition A4O4TiSe4 (A=Sm, Gd–Er, Y) via solid state reactions of A2O3, TiSe2 and Se at 900 °C. They are all isostructural with Gd4O4TiSe4. Structures have been refined from powder X-ray diffraction data and have monoclinic C2/m symmetry with unit cell parameters of a≈15.7 Å, b≈3.75 Å, c≈9.65 Å and β≈117.5°. They contain infinite ribbons of edge-sharing A4O and A3TiO tetrahedra 4 units wide, which are linked by chains of TiSe4O2 edge-sharing octahedra. Compositions A=Gd–Ho, Y are semiconductors with conductivities 1–3 Sm−1 at 300 K, with electronic band gaps of between 0.25 and 0.37 eV. Magnetic susceptibility is reported from 1.8 K to 300 K for compositions A=Gd–Ho. Rare earth moments appear to order antiferromagnetically at low temperatures with Gd and Tb showing evidence of ferromagnetism due to spin canting over a narrow temperature range close to TN.

Citation

Tuxworth, A., & Evans, J. (2014). Synthesis, structure and properties of the oxychalcogenide series A4O4TiSe4 (A=Sm, Gd, Tb, Dy, Ho, Er and Y). Journal of Solid State Chemistry, 210(1), 188-194. https://doi.org/10.1016/j.jssc.2013.11.006

Journal Article Type Article
Acceptance Date Nov 2, 2013
Online Publication Date Nov 21, 2013
Publication Date Feb 1, 2014
Deposit Date May 4, 2015
Publicly Available Date Feb 13, 2018
Journal Journal of Solid State Chemistry
Print ISSN 0022-4596
Electronic ISSN 1095-726X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 210
Issue 1
Pages 188-194
DOI https://doi.org/10.1016/j.jssc.2013.11.006
Public URL https://durham-repository.worktribe.com/output/1406272

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