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.
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.
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|
|Peer Reviewed||Peer Reviewed|
Published Journal Article
Publisher Licence URL
© 2013 The Authors. Published by Elsevier Inc. Open access under CC BY license.
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