Molten salt flux synthesis of cobalt doped refractory double perovskite Sr 2CoxGa1-xNbO6: A spectroscopic investigation for multifunctional materials

Maneesha Varghese (1) , Mathieu Duttine (1) , Hitesh Duggal (1) , Nicolas Penin (1) , Eric Lebraud (1) , Alexandre Fargues (1) , Olivier Toulemonde (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

A simple and cost-effective salt synthesis route toward refractory oxides of composition Sr 2 Ga 1-x Co x NbO 6 has been carried out. Herein, we report on the refinement of the set of parameters related to heat treatment to stabilize the ordered perovskite for cobalt content, x, ranging from 0.02 to 0.2. The parameters studied were the nature of the flux, the dwell temperature, the dwell time and the cooling rate for a given cobalt precursor. Our study relied on powder X-ray diffraction, UV-visiblenear IR (UV-vis-NIR), Electron Spin Resonance (ESR) and Nuclear Magnetic Resonance (NMR) experiments allowing us to better understand the room temperature electronic structure. The tuning of energy gap with the cobalt content, mixed spin state Co 3+ (Low Spin + Intermediate/High Spin) at room temperature and the brown shades of these materials render them the multifunctionality.

Mots clés: Mutifunctional material; Double Perovskite; Molten salt flux synthesis; Electron Spin Resonance; Nuclear Magnetic Resonance; UV-vis-NIR spectroscopy

Domaines: Matériaux

Maneesha Varghese, Mathieu Duttine, Hitesh Duggal, Nicolas Penin, Eric Lebraud, et al.. Molten salt flux synthesis of cobalt doped refractory double perovskite Sr 2CoxGa1-xNbO6: A spectroscopic investigation for multifunctional materials. Journal of Solid State Chemistry, 2022, 315, 123507 (10 p.). ⟨10.1016/j.jssc.2022.123507⟩. ⟨hal-03777165⟩