J. Mater. Sci. Technol. ›› 2014, Vol. 30 ›› Issue (12): 1213-1216.DOI: 10.1016/j.jmst.2014.02.003

• Orginal Article • Previous Articles     Next Articles

Role of Heavy Metal Ions in the Formation of Oxyfluoride Glasses and Glass Ceramics

Min Liu1, Lijuan Zhao1, 2, Yan Liu1, Zijian Lan1, Lifen Chang1, Yiming Li1, Hua Yu1   

  1. 1、The MOE Key Laboratory of Weak Light Nonlinear Photonics and School of Physics, Nankai University, Tianjin 300071, China; 2、TEDA Applied Physics Institute, Nankai University, Tianjin 300457, China
  • Received:2013-12-29 Revised:2014-02-21 Online:2014-12-20 Published:2015-07-23
  • Supported by:
    This work was supported by the National Science Fund for Talent Training in Basic Sciences (No. J1103208).

Abstract: In order to investigate the influence of different heavy metal ions on the formation of the oxyfluoride glasses and glass ceramics, samples with different PbF2/CdF2 ratios have been prepared by the melting quenching and thermal treatment method. The different effects of Pb2+ and Cd2+ on the glass network structure are investigated by FTIR and Raman spectra. During the formation of glass network structure, Pb2+ prefers to break the Si-O-Si bond and subsequently bond to F- for charge compensation, and Cd2+ prefers to break the Si-O-Al bond and is surrounded by O2-. Pb2+ and F- gather together and form the fluoride nanocrystals, while Cd2+ remains in oxide matrix after thermal treatment. Introduction of proper CdF2 is important to adjust and control the glass network structure and crystallization process in the fabrication of the transparent glass ceramics.

Key words: Pb, Cd, Glass network, Oxyfluoride glass ceramics