Abstract
In this paper, the structural phase transition, surface morphologies, ferromagnetic and optical properties have been observed in [K1/2Na1/2NbO3]1-x [BaNi1/2Nb1/2O3-δ]x (KNBNNO, 0 ≤ x ≤ 1) films. X-ray diffraction indicated that the KNBNNO films undergo a phase transition process with increasing BaNi1/2Nb1/2O3-δ content from 0 to 1, which mainly stems from the Ni2+ doping-induced local lattice strain. Moreover, with an increase in BaNi1/2Nb1/2O3-δ content, the band-gap of the KNBNNO films shows a non-linear variation, namely, a premier sharp decline for x from 0 to 0.3 and a remarkable elevating between 0.3 and 1.0. Additionally, with increasing x from 0 to 1, the magnetism transition behavior from diamagnetism to ferromagnetism for KNBNNO films may originate from ferromagnetic exchange interaction between the magnetic Ni2+ ions and a spin-polarized electron trapped at oxygen vacancy. These results are helpful in deeper understanding of structural transition, magnetic, and optical properties in perovskite oxides, which show that the materials can play potential roles in multiferroic applications and solar energy devices.
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