CRYSTAL-GROWTH OF BAB2O4 FROM MELT USING A PT TUBE AS A SEED

Single crystals of the low-temperature (beta) phase of BaB2O4 have bee n grown by the Czochralski method using a Pt tube as a seed. A beta-ph ase polycrystal was formed inside the Pt tube at first, but a single c rystal formed subsequently. After the growth in the Pr tube, a single- crystal boule could be grown continuously by the usual Czochralski met hod. In addition, a single crystal could be grown along a particular c rystallographic direction when a beta-phase single-crystal seed was mo unted inside the Pt tube and the beta-alpha phase transformation was p revented before seeding.