Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Studies on the Structure and Optical Properties of BaSrMgWO6 Thin Films Deposited by A Spin Coating Method

Version 1 : Received: 24 July 2022 / Approved: 27 July 2022 / Online: 27 July 2022 (06:09:08 CEST)

A peer-reviewed article of this Preprint also exists.

Punga, L.; Abbassi, A.; Toma, M.; Alupului, T.; Doroftei, C.; Dobromir, M.; Timpu, D.; Doroftei, F.; Hrostea, L.; Rusu, G.G.; Razouk, A.; Iacomi, F. Studies of the Structure and Optical Properties of BaSrMgWO6 Thin Films Deposited by a Spin-Coating Method. Nanomaterials 2022, 12, 2756. Punga, L.; Abbassi, A.; Toma, M.; Alupului, T.; Doroftei, C.; Dobromir, M.; Timpu, D.; Doroftei, F.; Hrostea, L.; Rusu, G.G.; Razouk, A.; Iacomi, F. Studies of the Structure and Optical Properties of BaSrMgWO6 Thin Films Deposited by a Spin-Coating Method. Nanomaterials 2022, 12, 2756.

Journal reference: Nanomaterials 2022, 12, 2756
DOI: 10.3390/nano12162756

Abstract

Highly transparent thin films with the chemical formula BaSrMgWO6 were deposited by spin coating using a solution of nitrates of Ba, Sr and Mg and ammonium paratungstate in dimethylformamide with a ratio Ba:Sr:Mg;W=1:1:1:1. XRD, SEM, EDX and XPS investigations evidenced that an annealing at 800 ºC for 1h leaves the structure amorphous with a precipitate on the surface and that a supplementary annealing at 850 ºC for 45 min forms a nanocrystalline structure and dissolves a part of precipitates. It was evidenced a textured double perovskite cubic structure (61.9%) decorated with tetragonal and cubic impurity phases (12.7 %) like BaO2, SrO2 and MgO and an under-stoichiometric phase (24.4%) with the chemical formula Ba2-(x+y) SrxMgyWO5. From transmittance measurements the values of optical band gap were estimated for the amorphous (Eg= 5.15) and nanocrystalline (Eg=4.58 eV) phases. The presence of a lattice disorder was indicated by the high values of Urbach and weak absorption tail energies A decrease in their values was observed and attributed to the crystallization process and cation redistribution.

Keywords

thin films; double perovskite; structure; optical properties

Subject

MATERIALS SCIENCE, Surfaces, Coatings & Films

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