Glass formation in the systems (K or Cs)2O(Nb or Ta)2O5Al2O3

Abstract The glass-forming ability of melts in the systems K 2 O(Nb and/or Ta) 2 O 5 Al 2 O 3 as well as those in which K 2 O was replaced with Li 2 O, Na 2 O, Cs 2 O, BaO or PbO was investigated. Some melts in the systems (K or Cs) 2 O(Nb and/or Ta) 2 O 5 Al 2 O 3 could be made into glasses by cooling, yielding practically useful amounts. The structures of these glasses were discussed on the basis of their infrared spectroscopic and X-ray emission spectroscopic analyses.