Figure 2. X-ray diffraction patterns of SrCO3 products obtained using (A) simple precipitation, (B) the hydrothermal method, and (C) the ligand-assisted hydrothermal method. Strontium carbonate (SrCO3) is important inorganic material and is widely used as an additive in the glass of color television tubes to block X-rays and improve glass quality. SrCO3 is also used in ferrite magnets, pigments, iridescent materials, and as a catalyst. The development of specific microstructure morphologies has attracted significant interest due to their novel properties and potential applications. Recently, a variety of SrCO3 microand nano-structures, such as, rods, wires, ribbons, flowers, hexagonal prisms, and spheres, have been synthesized. Furthermore, soft-templates are commonly used to fabricate SrCO3 crystals with specific morphologies. For example, dumbbell-like crystals were prepared using a poly (styrene-alt-maleic acid), and ribbonand flower-like crystals were prepared using anionic surfactant and mixed nonionic/ anionic surfactants, respectively. In this paper, we report a simple hydrothermal method free of surfactants that can be used to prepare elongated hexagonal pyramidal SrCO3 crystals from strontium nitrate and urea. Furthermore, the aspect ratios of the hexagonal prisms and rods produced were controlled by adding N,N,N’,N’-tetramethylethylenediamine (TMEDA) to the hydrothermal reaction between Sr(NO3)2 and urea as a structure-directing agent.