Crystal growth of BaB2O4 from melt using a Pt tube as a seed

Single crystals of the low-temperature (beta) phase of BaB2O4 have been grown by the Czochralski method using a Pt tube as a seed. A beta-phase polycrystal was formed inside the Pt tube at first, but a single crystal formed subsequently. After the growth in the Pr tube, a single-crystal boule could be grown continuously by the usual Czochralski method. In addition, a single crystal could be grown along a particular crystallographic direction when a beta-phase single-crystal seed was mounted inside the Pt tube and the beta-alpha phase transformation was prevented before seeding.