Optical and dielectric spectroscopic analysis of SmMn2O5. (9th October 2020)

• Record Type: Journal Article
• Authors: Ahmad, J; Bukhari, S H; Khan, J A; Jamil, M T; Nissar, U; BiBi, S; Sultan, T
• Is Part Of: Physica scripta. Volume 95:Number 11(2020)
• Publication Date: 2020-10-09
• Subjects: infrared reflectivity -- optical conductivity -- UV absorption -- activation energy -- dielectric relaxation; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/abbcf5
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: Polycrystalline SmMn2 O5 has been synthesized by using sol-gel auto combustion tecnique. X-ray diffraction (XRD) pattern reflects the single phase formation of orthorhombic structure with Pbam space group. In the frequency range of (30–1000 cm −1 ) reflectivity spectrum reveals the 14 infrared active phonons out of 36, which are already pridicted theoretically. We have estimated the optical energy band gap (E g ) ≃ 1.5 eV from UV–visible absorption spectrum. Temperature dependent (293-533 K) DC electrical characterization up to 40 V suggests semiconducting nature of the material. The temperature dependent impedance spectroscopy within a broader frequency range of (20 Hz—3 GHz) shows decreasing behavior of dielectric constant and tangent loss while AC conductivity increasing with the rise in frequency and temperature suggest the strong frequency dispersion and relaxational behavior of the material. The activation energy calculation from AC conductivity is in good agreement with semiconducting material energy band gap.