Abstract
Optical phonons in SiO2 samples prepared by the sol-gel method and colored by doping with Fe and Cu were studied using X-ray diffraction, electron spin resonance and infrared spectroscopy. The vibration modes in pure and Cu- or Fe-doped glasses are investigated as a function of doping concentration and annealing temperature. It is found that the heat treatments in air atmosphere have a remarkable influence on the width of the stretching absorption bands related to the asymmetric vibrations in the SiO2 matrix. A simple description of the different types of vibration modes in the quasilinear Si–O–Si chain is given and correlated with the characteristics of the phonon bands observed. A relation between the bandwidth of these modes and the change in the phonon scattering rate caused by the Cu or Fe doping is established. Based on this model, the percentage of Cu incorporated on the Si sites into SiO2 matrix was calculated. The behavior of the vibration spectra in Fe-doped glasses is different and it indicates less incorporation of this element into the SiO2 matrix.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
