Growth of large dimension BaWO4 crystal by the Czochralski method

In this paper, polycrystalline materials of BaWO4 were synthesized by solid-state phase method, and a single crystal of BaWO4 was successfully grown along a and c-axis direction by using the Czochralski method. Up to 20 x 22 x 80 mm(3) BaWO4 crystal was obtained, and X-ray powder diffraction results show that the as-grown BaWO4 crystal belongs to the scheelite structure. The effective segregation coefficients of Ba and W of the BaWO4 crystal were measured by the X-ray fluorescence method, and the effective segregation coefficients of Ba and W were near 1. The rocking curve from (200) diffraction plane of as-grown BaWO4 single crystal was measured on the High-resolution Xray diffractometer D5005, and the full-width at half-maximum value was found to be 26.64" The density and hardness of the BaWO4 crystal was measured, the measured density was in agreement with the calculated result, and the Mohs hardness was about 4. (C) 2004 Elsevier B.V. All rights reserved.