Nb2O5 nanosize powders prepared by sol-gel - Structure, morphology and dielectric properties

► Pechini route, using niobium chloride has raw material, is suitable for the preparation of nanosize Nb2O5 powders. ► The thermal temperature promotes the formation of Nb2O5 in amorphous, orthorhombic and monoclinic phases. ► The sample treated at 900 °C, presenting both the Nb2O5 crystal structures, shows the biggest dielectric constant.