Investigation On Properties Of Defective Oxide Synthesized By Arc-melting

In this paper,the arc melting method is used to treat complex oxides in a simple and efficient way to change its internal structure and improves its optical and electrical properties.Herein,we use a facile and fast process to implant plenty of defects in undoped SrTiO₃ based on arc-melting technology,which has been shown as an effective way to tune the bandgap of oxide semiconductors.Defective perovskite SrTiO₃ has been synthesized by rapid solidification of its melts obtained from arc-melting treatment.As a result of rich and stable defects implanted in SrTiO₃,the bandgap was narrowed from3.29 eV to 3.08 eV by implanting numbers of defects in the process.Moreover,greatly enhanced photocatalytic properties have been shown under simulated solar irradiation.The arc-melted SrTiO₃ can degrade more than 90%of RhB in 60 min.To evaluate the thermal stability of arc-melted SrTiO₃,the degradation test was performed on the photocatalytic activity of the arc-melted SrTiO₃ samples,the photocatalytic activity was highly improved compared with pristine SrTiO₃ and the excellent photocatalytic thermal stability of arc-melted SrTiO₃ was proved.we successfully prepared high quality LiFePO₄ bulk with texture structures by a rapid arc-melting treatment.The LiFePO₄ bulk materials,which have millimeter dimensions,have highly enhanced electronic conductivity of 9.5×10^-7 S/cm along[020]direction at room temperature.The electrical conductivity of LiFePO₄,which have been increased by about three orders of magnitude,is interesting to investigate high-performance cathode for Li-ion batteries.