DIMER ORDER–DISORDER TRANSITION DEPENDENCE ON THE OPTICAL ABSORPTION PARAMETERS OF THEKHCO3COMPOUND

S. Abouelhassan, F. Salman, E. Sheha and M. K. El-Mansy
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S. Abouelhassan: Physics Department, Faculty of Science, Banha University, Farid Nada Street, Banha, Kalubia, Egypt
F. Salman: Physics Department, Faculty of Science, Banha University, Farid Nada Street, Banha, Kalubia, Egypt
E. Sheha: Physics Department, Faculty of Science, Banha University, Farid Nada Street, Banha, Kalubia, Egypt
M. K. El-Mansy: Physics Department, Faculty of Science, Banha University, Farid Nada Street, Banha, Kalubia, Egypt

Surface Review and Letters (SRL), 2004, vol. 11, issue 02, 199-203

Abstract: KHCO3compounds have been grown by the slow evaporation technique of an aqueous solution. The absorption process at the absorption edge of the compounds in the temperature range around the phase transition temperature(TF≈322K)was investigated. The sample exhibited exponential behavior of the absorption edge following Urbach's rule. The Urbach parameters were determined and their temperature dependence was investigated, where drastic variations of these parameters atTFwere detected. The steepness parameter(s), the optical gap(Eg)and the disorder parameter(B)illustrate anomalous behavior with temperature. This behavior has been discussed in the light of the concept of order–disorder transition.

Keywords: Optical properties; steepness parameters (search for similar items in EconPapers)
Date: 2004
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DOI: 10.1142/S0218625X04005974

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