Single crystals of Co-doped B1-xSrxTiO3 (Co:BST) have been grown by high-temperature solution growth technique. The dopant has significant effect on the growth parameters and considerably reduced the twin formation in the grown crystal. Bulk single crystals of dimensions 5 x 5 x 4 mm(3) have been grown with optimized growth parameters. Layer growth and vein-like structure patterns. indicative of 2D nucleation mechanism. have been observed oil the grown crystals. The presence of dopant in the grown crystals was confirmed by EDX analysis. For lower doping concentration (0.1 mol%), the crystal possesses tetragonal structure and changes to cubic for higher dopant level ( 1 and 5 mol%) Co doping in BST increases the dielectric constant values and decreases the Curie temperature (T-C). The spontaneous polarization (P-s) value for 0.1 mol% of Co-doped BST crystal is measured to be 22 muc/cm(2) and the value decreases with increasing Co concentration (C) 2002 Elsevier Science B.V. All rights reserved.