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Abstrakty
Test samples of ternary glass tellurite [(TeO2)65(B2O3)35]y[Ag2O]y with y = 10, 15, 20, 25, 30 mol % have been fabricated and their physical and optical properties were investigated. The optical absorption was recorded at room temperature in the wavelength range from 200 to 800 nm. From the absorption edge data, the value of the optical band gap Eopt and the Urbach energy ?E were evaluated. The value of Eopt lies between 2.15 eV and 1.85 eV for the indirect transition and for direct transition the values vary from 2.77 eV to 2.35 eV. From the experimental results, values of the optical band gap and Urbach energy were calculated. They were found to be dependent on the glass composition.
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Rocznik
Tom
Strony
173--180
Opis fizyczny
Bibliogr. 15 poz.
Twórcy
autor
autor
autor
autor
autor
- Ultrasonic Laboratory Department of Physics Faculty of Science University Putra Malaysia 43400 Serdang, Selangor Malaysia
Bibliografia
- [1] JOSEPH C.M., BINU P.R., SHREEKRISNAKUMAR R., MENON C.S., Mat. Lett., 50 (2001), 251.
- [2] VIJAYA PRAKASH G., NARAYANA RAO D., BHATNAGAR A.K., Solid State Commun., 119 (2001), 39.
- [3] RAJENDRAN V., PALANIVELU N., CHAUDHURI B.K., GOSWANI K., J. Non-Cryst. Solids 320 (2003), 195.
- [4] EL-MALLAWANY R., Tellurite Glasses Handbook. Physical Properties and Data, CRC Press, Boca Raton, 2002.
- [5] SADDEEK Y.B., Phys. B, 344 (2004), 163.
- [6] CHOWDARI B.V.R., PRAMODA KUMARI P., Solid State Ionics, 86–85 (1996), 521.
- [7] SINDHU S., SANGHI S., ARGAWAL A., SONAM S.V.P., KISHORE N., Physica B, 365 (2005), 65.
- [8] HOGARTH C.A., HOSSEINI A.A., J. Mater. Sci., 18 (1983), 2697.
- [9] SHALTOUT I., YI TANG, BRAUNSTEIN R., SHAISHA E.E., J. Phys. Chem. Solids, 57 (1996), 1223.
- [10] MOTT N.F AND DAVIS E.A., Electronic Processes in Non-Crystalline Materials, Oxford University Press, London, 1971, pp. 293.
- [11] AL-ANI S.K.J., AL-HASSANY I.H.O., AL-DAAN Z.T., J. Mater. Sci., 20 (1995), 661.
- [12] SREEKANTH CHAKRADAR R.P., SIVARAMAIAH G., LAKSHMANA R., GOPAL N.O., Spectrochim. Acta, Part A, 62 (2005), 761.
- [13] EL-MALLAWANY R., J. Alloys. Compd., 394 (2005), 292.
- [14] SADDEEK Y.B., ABD EL-LATIF L., Phys. B, 348 (2004), 475.
- [15] EL-MALLAWANY R., Mater. Chem. Phys., 53 (1998), 93.
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BPW7-0012-0051