Kumar, B.S.Shanmugharaj, A.M.Kalpathy, S.K.Anandhan, S.2026-02-052017Ceramics International, 2017, 43, 9, pp. 6845-68572728842https://doi.org/10.1016/j.ceramint.2017.02.105https://idr.nitk.ac.in/handle/123456789/25601In this study, we report for the first time the synthesis of nickel titanate (NTO) nanofibers containing a mixture of ilmenite and spinel phases of NTO, at an atypical low temperature. Precursor nanofibers produced by sol-gel electrospinning were calcined at three different temperatures to produce the NTO nanofibers. Thermal analysis along with X-ray photoelectron spectroscopy confirmed the formation of non-crystalline stable phases of TiN and Ti-O-N that restrained the formation of ilmenite NTO, and the Ni-rich environment pushed the Ti atoms to tetrahedral sites to form a defective spinel structure. The crystallite size of spinel NTO was observed to increase as a function of the calcination temperature above 700 °C, as the activation energy for coalescence and growth of spinel NTO was favorable. NTO nanofibers obtained above the calcination temperature of 700 °C exhibited new band gap energy around 2.5 eV in Tauc plot. Oxygen vacancies in these ceramic nanofibers decreased as the calcination temperature was increased. A hypsochromic shift of 20 nm in the photoluminescence spectra suggested that the material had a Ni2+ rich NTO (spinel). © 2017 Elsevier Ltd and Techna Group S.r.l.Activation energyCalcinationCeramic materialsCrystallite sizeDefectsElectrospinningEnergy gapIlmeniteNanofibersNanostructuresNickelOxygen vacanciesPhotoluminescenceSol-gel processSol-gelsSpinning (fibers)TemperatureThermoanalysisTitanium compoundsCalcination temperatureCeramicCeramic nanofibersHypsochromic shiftsNickel titanatesPhotoluminescence spectrumSpinel structureTetrahedral sitesX ray photoelectron spectroscopy