Sodium niobate(NaNbO3)is a nontoxic and highly stable perovskite structure which has attracted extensive attentions in the fields ranging from nonlinear optics,optoelectronics to photocatalysis.Previous reports have demonstrated that orthorhombic NaNbO3 nanostructures is a high-efficient photocatalyst for hydrogen production and decomposition of toxic pollutants.However,besides the orthorhombic phase,NaNbO3 nanostructures have many other phases including cubic,tetragonal and rhombohedral.Compared to orthorhombic NaNbO3,the cubic NaNbO3(c-NaNbO3)nanostructures present higher symmetry which resulted in a narrower band gap than that of o-NaNbO3.Thus,c-NaNbO3 nanostructures should exhibit a long wavelength absorption edge which turns to enhance their visible-light-response and photocatalytical properties.The wide application of c-NaNbO3 nanostructured photocatalyst is still hindered due to the lack of effective synthetic strategies.In this paper,we introduce a facile method to scale synthesize c-NaNbO3 nanostructures.Niobium metal complex and sodium chloride were firstly homogeneous mixed in deionized water with an appropriate proportion,and then dried in a vacuum oven to obtain precursor powder.Then the dried precursor powder were moved into a sintering furnace and heated up to 260-500 ℃ and maintained for several hours.Transmission electron microscopy(TEM),X-ray diffraction(XRD)and UV-visible absorption spectroscopy(UV-vis)were used to characterize the morphologies,crystal structures and optical properties of the as-prepared samples.TEM images revealed that the as-prepared nanostructures have different morphology including nanoparticles,nanorods,nanosheets and nanowires.The XRD patterns demonstrated that the as-prepared NaNbO3 nanostrucures are stable cubic phase with high crystallinity.The UV-vis absorption spectra of the c-NaNbO3 nanostructures presented an obvious absorption peak at 275 nm and an absorption edge at 400 nm,which exhibited an obvious red shift than that of o-NaNbO3.All the data mentioned above demonstrated that this synthetic strategy offers an effectively and economical method to fabricate pure cubic NaNbO3 nanostructures.The as-prepared abundant c-NaNbO3 nanostructures show great potential in fields ranging from optoelectronics,photocatalysis to solar cells.