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    STUDIA PHYSICA - Ediţia nr.2 din 2015  
         
  Articol:   SPECTROSCOPIC PROPERTIES OF CERIUM-BORO-BISMUTHATE GLASSES.

Autori:  V. POP, E. CULEA.
 
       
         
  Rezumat:  

Published Online: 2015-12-01
Published Print: 2015-12-25

VIEW PDF: SPECTROSCOPIC PROPERTIES OF CERIUM-BORO-BISMUTHATE GLASSES

X-Ray diffraction (XRD), density measurements, Fourier transform infrared (FTIR), diffuse reflectance ultraviolet–visible (DR-UV-Vis) and photoluminescence (PL) spectroscopies were performed on the glasses in the xCeO2•(100-x)[4Bi2O3•B2O3] system, with 0 ≤ x ≤ 15 mol%, in order to point out the effect of CeO2 addition to the boro-bismuthate host glass matrix on the local structure, optical and luminescent properties. The XRD patterns confirm a long-range structural disorder characteristic of amorphous network. FT-IR spectroscopy reveals absorption bands which are characteristic of BiO3, BiO6, BO3 and BO4 structural units. The optical band gap values for the studied glasses were calculated from the DR-UV-Vis spectra. The peaks evidenced by PL spectroscopy measurements are due to the presence of bismuth, in different valence states, in the studied glasses. Luminescence data show that the peaks intensity decrease over a content of 5 mol% CeO2, this concentration representing the critical value over which the luminescence quenching becomes important.

Keywords: Boro-bismuthate glasses; Cerium ions; XRD; FTIR; Optical and luminescent properties.
 
         
     
         
         
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