J. Iran. Chem. Soc., Vol. 8, No. 2 June 2011, pp.562~569.

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Hydrothermal Growth of Calcium Titanate Nanowires from Titania

S.K. Durrania,*, Y. Khanb, N. Ahmed, M. Ahmadc and M.A. Hussaina

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

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