Single crystals of BPO4 with sizes up to 15 x 10 x 12 mm(3) were grown by top-seeded solution growth method using Li2O-Li4P2O7 as fluxes. The components volatilized from the melt were characterized by the method of X-ray powder diffraction. The defects of grown crystals have also been investigated. The measured ultraviolet cutoff edge of BPO4 was about 130 nm. Its density was 2.82 g/cm(3) determined using drainage method. (C) 2004 Elsevier B.V. All rights reserved.