Phase evolution and electrical properties of Co-Sb alloys fabricated from Co/Sb bilayers by thermal annealing and ion beam mixing

An investigation was carried out to understand the phase evolution and study the structural, morphological, optical and electrical properties of Co-Sb alloys fabricated by two different approaches: (a) thermal annealing and (b) ion-beam mixing followed by post annealing. The as-deposited and 100 MeV...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2015-10, Vol.17 (37), p.24427-24437
Main Authors: Bala, Manju, pannu, Compesh, Gupta, Srashti, Tripathi, Tripurari S, Tripathi, Surya K, Asokan, K, Avasthi, Devesh K
Format: Article
Language:English
Subjects:
Alloys
Annealing
Antimony
Cobalt base alloys
Energy gaps (solid state)
Intermetallics
Ion beams
Irradiation
Thermoelectricity
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Summary:An investigation was carried out to understand the phase evolution and study the structural, morphological, optical and electrical properties of Co-Sb alloys fabricated by two different approaches: (a) thermal annealing and (b) ion-beam mixing followed by post annealing. The as-deposited and 100 MeV Ag ion beam irradiated Co/Sb bilayer thin films were subjected to thermal annealing from 200 to 400 °C for 1 hour. The Rutherford backscattering spectrometry (RBS) results showed partial mixing for the thermally annealed films and complete mixing for the irradiated and post annealed films at 400 °C. The XRD and RAMAN measurements indicated the formation of Co-Sb alloy, with ∼70% concentration of CoSb 3 phase in the irradiated post annealed sample at 400 °C. The band gaps of the annealed and post irradiated annealed Co-Sb alloys were determined using UV-visible spectroscopy. Electrical and thermoelectric power measurements were performed in the temperature range of 300-420 K. It was observed that the alloys formed by ion-beam induced mixing exhibited higher electrical conductivity and thermoelectric power than the as-deposited and thermally annealed Co/Sb bilayer thin films. Thermoelectric power enhancement of ion beam synthesized Co-Sb alloy thin films.
ISSN:1463-9076
1463-9084
DOI:10.1039/c5cp03360h