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Spectroscopic properties and conduction mechanism of KAl(SO4)2:xSm: A multifunctional materials for optical and electrochemical applications.

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Title: Spectroscopic properties and conduction mechanism of KAl(SO4)2:xSm: A multifunctional materials for optical and electrochemical applications.
Authors: Souemti, Ahmed1 (AUTHOR) ahmed.souemti@fst.utm.tn, Labidi, Islem1 (AUTHOR), Megriche, Adel1 (AUTHOR)
Source: Ceramics International. Aug2022, Vol. 48 Issue 15, p21552-21560. 9p.
Subjects: Optical materials, X-ray powder diffraction, Optical measurements, Activation energy, Lattice constants
Abstract: Anhydrous α-alum materials doped with the trivalent samarium oxide Sm 2 O 3 and denoted as KAl(SO 4) 2 :xSm (x = 0; 0.5; 1; 1.5; 2; 2.5% mol.) are prepared by the solid-state reaction method at 350 °C. The resulting phases are crystallized in a simple hexagonal structure with space group P321. Powder X-ray diffraction (XRD), Infrared (IR), and Raman spectroscopies confirmed a high purity of phases with variation in lattice parameters according to the amount of doping. Optical measurements through absorption and fluorescence spectroscopies in the ultra-violet and visible regions prove the different electronic transitions between excited levels and 6H 5/2 ground state of Sm3+, the incorporation of samarium in the crystal structure, and suggest the quenching phenomenon. The materials presented in the study showed an ionic semiconductor behavior with an increase in their conductivity as a function of the doping level. A 1D conduction is made according to the Correlated Barrier Hopping CBH model by cations mobility in crystalline sites under the effect of thermal agitation in the [170–250 °C] region. KAl(SO 4) 2 : xSm (x = 1.5% mol.) with its lower activation energy value, is suggested as a suitable cathode material for aluminum-based batteries. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Anhydrous α-alum materials doped with the trivalent samarium oxide Sm 2 O 3 and denoted as KAl(SO 4) 2 :xSm (x = 0; 0.5; 1; 1.5; 2; 2.5% mol.) are prepared by the solid-state reaction method at 350 °C. The resulting phases are crystallized in a simple hexagonal structure with space group P321. Powder X-ray diffraction (XRD), Infrared (IR), and Raman spectroscopies confirmed a high purity of phases with variation in lattice parameters according to the amount of doping. Optical measurements through absorption and fluorescence spectroscopies in the ultra-violet and visible regions prove the different electronic transitions between excited levels and 6H 5/2 ground state of Sm3+, the incorporation of samarium in the crystal structure, and suggest the quenching phenomenon. The materials presented in the study showed an ionic semiconductor behavior with an increase in their conductivity as a function of the doping level. A 1D conduction is made according to the Correlated Barrier Hopping CBH model by cations mobility in crystalline sites under the effect of thermal agitation in the [170–250 °C] region. KAl(SO 4) 2 : xSm (x = 1.5% mol.) with its lower activation energy value, is suggested as a suitable cathode material for aluminum-based batteries. [ABSTRACT FROM AUTHOR]
ISSN:02728842
DOI:10.1016/j.ceramint.2022.04.125