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Determination of Kinetic Parameters of Bi 2 Se 3 Thin Films by Computation
Author(s) -
Nataraj D.,
Prabakar K.,
Narayandass Sa.K.,
Mangalaraj D.
Publication year - 2000
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/1521-4079(200009)35:9<1087::aid-crat1087>3.0.co;2-w
Subject(s) - activation energy , differential scanning calorimetry , analytical chemistry (journal) , kinetic energy , amorphous solid , thin film , reaction rate constant , thermodynamics , materials science , substrate (aquarium) , evaporation , thermal analysis , phase (matter) , chemistry , thermal , kinetics , crystallography , nanotechnology , physics , chromatography , oceanography , organic chemistry , quantum mechanics , geology
Bi 2 Se 3 thin films are prepared by thermal evaporation method onto well‐cleaned glass substrates. From the XRD analysis, the film is found to be amorphous in nature. Thermal analysis of Bi 2 Se 3 sample scraped off from the glass substrate is performed using the technique differential scanning calorimetry (DSC) at different heating rates. Kissinger method is used to analysis these constant heating rate spectra and the activation energy 'E a ′ corresponding to the phase transformation is calculated through the examination of the DSC peak temperature shift induced by variation of the heating rate. An analytical equation with three kinetic parameters (activation energy (E a ), transformation order (n) and the frequency factor (v)) is derived from the Johnson‐Mehl‐Avrami (JMA) theory to describe the constant heating rate DSC spectra. Using the activation energy from Kissinger plot, theoretical constant heating rate DSC traces are generated for arbitrary values of 'v' and 'n' using the analytical equation. Finally, theoretically generated DSC spectra is compared with that of the experimental one and the unknown values 'v' and 'n' are determined.