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| Synthesis Silicon Dioxide (SiO2) at Different Temperatures and Study their Optical and Structural Properties
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Fawaz Taha Omer, Mubarak DirarAbd Allah, Abdalskhi.S.M.H, Sawsan Ahmed Elhouri Ahmed & E. Elnaiem, M. A
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Abstract:
Five samples of Silicon Dioxide (SiO2) were Synthesed at different temperatures (300,350,400,450 and 500)OC using hydrothermal method. Structural Characterization , vibritional freqinces and some optical properties were determined using X-ray diffractometer (XRD), Fourier Transform Infrared Spectrophotometer(FTIR) and UV-VIS min 1240 spectrophotometer respectively. All peaks determine transformation of dried powder to SiO2 crystallites with cubic rutile crystal structure, the grains size of SiO2 increased from 24.1nm to 55.1nm as the temperature increase from 300OC to 500 OC. For all samples the band positions are present study the absorption bands ?1, ?2, ?3, ?4, ?5, ?6 and ?7 are found to be around455.5 cm-1, 613.4 cm-1, 1027.1 cm-1, 1381.45 cm-1, 2357.09 ?cm?^(-1)and 3422.53 cm-1 respectively for all the compositions. All optical properties studied in range of (400 - 800) nm wavelength range for SiO2 samples, the absorption increase from 0.46 (a.u) to 0.64 (a.u) at wavelengths 515 nm as the temperature increase from 300OC to 500OC. The maximum reflection observed at wavelength 475 nm equal 0.204 (a.u) then it decreases to zero at wavelength >790 nm, the value of absorption coefficient coefficient increase from 2.1×104 cm-1 to 2.9×104cm-1 at wavelength 515nm as the annelaing temperater increase, finally, the optical energy band gap was decreased from (1.976) eV to (1.937 ) eV as the temperature increase from 300OC to 500OC .
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