The lattice parameter a of all the samples (both La0.5Sr0.5Ti0.95Ni0.05O3 and La0.5Sr0.5Ti1−xNixO3 nanofibers) are close to 0.3920 nm in the standard data (JCPDS No. 75-0267). The crystallite sizes and a values of both La0.5Sr0.5Ti0.95Ni0.05O3 and La0.5Sr0.5Ti1−xNixO3 nanofibers are also summarized in Table I.