Current location: JICS Archive > Vol. 8 > No. 2 > Articles : 22

Hydrothermal Growth of Calcium Titanate Nanowires from Titania

S.K. Durrani^a,*, Y. Khan^b, N. Ahmed, M. Ahmad^c and M.A. Hussain^a

^aMaterials Division, Directorate of Technology, PINSTECH, Islamabad, Pakistan
^bDepartment of Chemical and Materials Engineering, PIEAS, Islamabad, Pakistan
^cPhysic Division, Directorate of Science, PINSTECH, Islamabad, Pakistan

Perovskite calcium titanate (CaTiO₃) nanowires with average diameters in the range of 120-130 nm were grown by hydrothermal treatment of commercial anatase-titania (TiO₂) and calcium chloride in aqueous sodium hydroxide solution (2.5-13 M). Reactions were carried out in temperature range of 110-150 �°C at various pH (9-13) for 12-72 h. The study revealed that these parameters affect the crystal morphology and size of crystallites. Reaction products obtained at different stages were characterized by thermogravimetry (TG) and differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The XRD analysis revealed the formation of CaTiO₃ phases with orthorhombic crystal structure. Thermal analysis results showed that anatase-TiO₂ was thermally stable below 400 �°C and at higher temperatures anatase transforms to rutile phase whereas CaTiO₃ was stable up to 850 �°C.

Keywords: Hydrothermal growth, CaTiO₃, Nanowires, Thermal stability