MELT SUPERCOOLING BEHAVIOR AND CRYSTAL-GROWTH OF BA(B1-XMX)(2)O-4 (M,AL OR GA)

Supercooling behavior of BaB2O4 substituted with M (M: Al or Ga) for B was investigated. Moreover, single crystals were grown by the modifie d Czochralski method. Since Al and Ga are glass forming elements for t he berates such as BaB2O4, large supercooling was obtained by the subs titution of M for B. By controlling the M-amount single crystals of th e low-temperature phase were grown, preventing glass formation. The me rits of the substitution are the suppression of the solid-stale phase- transformation during growth and cooling, and the crystal hardening.