Abstract
The non-isothermal crystallization kinetics in ZrF4-BaF2-AlF3 and ZrF4-BaF2-LaF3 glasses were analyzed. It was found that the crystallization temperatures increase as the contents of AlF3 and LaF3 increase. Al and La atoms retarded the crystal growth in these glasses. The crystal phases precipitated in ZrF4-BaF2-AlF3 glasses were β-BaZrF6 and β-BaZr2F10 crystals, and the volume fraction of β-BaZr2F10 crystal increased as the content of AlF3 increased. The crystal phases in ZrF4-BaF2-LaF3 glass were β-BaZrF6 and an unknown phase. The activation energies for the crystal growth in these glasses were lower than those in ZrF4-BaF2 glasses. The mechanism of crystal growth was different from that in ZrF4-BaF2 glasses.
