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Mesoporous and nanocrystalline sol-gel derived NiTiO3 at the low temperature: Controlling the structure, size and surface area by Ni:Ti molar ratio
, Article Solid State Sciences ; Volume 12, Issue 9 , 2010 , Pages 1629-1640 ; 12932558 (ISSN) ; Fray, D. J ; Sharif University of Technology
2010
Abstract
Nanocrystalline nickel titanate (NiTiO3) thin films and powders with mesoporous structure were produced at the low temperature of 500 °C by a straightforward particulate sol-gel route. The sols were prepared in various Ni:Ti molar ratios. X-ray diffraction and Fourier transform infrared spectroscopy revealed that the powders contained mixtures of the NiTiO 3 and NiO phases, as well as the anatase-TiO2 and the rutile-TiO2 depending on the annealing temperature and Ni:Ti molar ratio. Moreover, it was found that Ni:Ti molar ratio influences the preferable orientation growth of the nickel titanate, being on (202) planes for the nickel dominant powders (Ni:Ti ≥ 75:25) and on (104) planes for the...