Please use this identifier to cite or link to this item: http://hdl.handle.net/2080/3809
Title: Extrinsic Effects on the Impedance Spectra of LaYFe2O6
Authors: Ghosh, R.
Barik, A.
Sahoo, M. R.
Tiwary, Sweta
Vishwakarma, P. N.
Keywords: Double Perovskite
Impedance spectroscopy
Porous
Diffusion
Diffusion
Issue Date: Dec-2022
Citation: 4th International Conference on Processing and Characterization of Materials(ICPCM), NIT Rourkela, India, 9th - 11th December 2022
Abstract: This work represents an effective approach to witness the true impedance profiles of the material. Here, an A-site double perovskite material LaYFe2O6 is prepared by the sol-gel auto combustion method. This material is characterized by the powder X-ray diffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), Thermogravimetric Analysis (TGA)-Differential Scanning Calorimetry (DSC), and Electrochemical Impedance Spectroscopy (EIS) technique. The XRD measurement confirms the successful synthesis of the said material with orthorhombic crystal structure having symmetry P21nm (~90%) and a slight contribution from Pbnm phase (~10%). The FESEM image suggests porous nature of the sample having grain size ~150 nm, sintered at 1473 K. TGA with simultaneous DSC measurement shows slight but gradual mass loss (related to the adsorbed gases/vapours) above 400K. The EIS (above-room-temperature region) shows, influence of the adsorbed gases/vapours in the pores of the pellet, on the impedance data. In this context, a homemade open – atmospheric impedance measurement setup (working range up to ~600 K) is developed. The EIS measurement are done for (1) as prepared sample (2) sample preheated to 473 K before performing EIS and (3) sample preheated to 400 K under vacuum. The process giving best result (having minimum effect of the adsorbed gases on the observed impedance spectra) is found by following the method (2); i.e., electroded sample is heated to 473 K in atmospheric conditions and brought back to room temperature to start the measuremen
Description: Copyright is with the conference publisher
URI: http://hdl.handle.net/2080/3809
Appears in Collections:Conference Papers

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