Issue 7, 2024

CoTeO4 – a wide-bandgap material adopting the dirutile structure type

Abstract

High-quality crystals of CoTeO4 were grown by application of chemical vapor transport reactions in closed silica ampoules, starting from polycrystalline material in a temperature gradient 640 °C → 580 °C with TeCl4 as transport agent. Crystal structure analysis of CoTeO4 from single crystal X-ray data revealed a dirutile-type structure with CoII and TeVI atoms at crystallographically distinct sites, each with point group symmetry [1 with combining macron]. The statistical significance and accuracy of the previously reported structural model based on powder data with the ordered arrangement of Co and Te cations was noticeably improved. CoTeO4 does not undergo a structural phase transition upon heating, but decomposes stepwise (Co2Te3O8 as intermediate phase) to Co3TeO6 as the only crystalline phase stable above 770 °C. Temperature-dependent magnetic susceptibility and dielectric measurements suggest antiferromagnetic ordering at ∼50 K. Optical absorption spectroscopy and computational studies reveal wide-band semiconductive behavior for CoTeO4. The experimentally determined band gap of ∼2.42 eV is also found for CdS, which is frequently used in photovoltaic systems but is hazardous to the environment. Hence, CoTeO4 might be a possible candidate to replace CdS in this regard.

Graphical abstract: CoTeO4 – a wide-bandgap material adopting the dirutile structure type

Supplementary files

Article information

Article type
Paper
Submitted
11 Dec. 2023
Accepted
16 Febr. 2024
First published
28 Febr. 2024
This article is Open Access
Creative Commons BY-NC license

Mater. Adv., 2024,5, 3001-3013

CoTeO4 – a wide-bandgap material adopting the dirutile structure type

M. Weil, P. Pramanik, P. Maltoni, R. Clulow, A. Rydh, M. Wildner, P. Blaha, G. King, S. A. Ivanov, R. Mathieu and H. Singh, Mater. Adv., 2024, 5, 3001 DOI: 10.1039/D3MA01106B

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