强磁场对金属离子掺杂CaTiO_3结构和光学性能的影响
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摘要
研究了800℃条件下不同制备磁场强度(最高12 T)对Ca Ti O3及其浸渍掺杂样品在结构和光学性能方面的影响.研究表明:样品吸光性能随浸渍掺杂的离子浓度的增大而提升,且发生红移现象;相同掺杂浓度下,磁场下制备样品的吸光性能均较非磁场下制备的样品有所提高,但不同磁场强度下所制备样品的吸光曲线彼此差异不大;此外,磁制备纯Ca Ti O3晶体粉末的X-射线衍射曲线峰左移,紫外-可见漫反射光谱吸收截止波长增长,这表明强磁场可使Ca Ti O3晶面间距和晶格常数增大、禁带宽度减小.
In the paper, the changes of structures and optical properties of metal ions doped modified Ca Ti O3 prepared under different magnetic field intensities(up to 12 T) and 800℃ are studied. The results indicate that the photo absorption performances are enhanced with the ions doped concentration increasing and red shift occurs significantly.With the same doped concentration, the photo absorption performances of the samples prepared under magnetic field are improved compared with under no magnetic field, while there are little differences among the absorption curves of these samples prepared under different magnetic field intensities. Furthermore, it is observed that the X-ray diffraction curve peaks of pure Ca Ti O3 prepared under magnetic field are all left-shifted and cutoff wavelengths of UV-vis are augmented,which indicates that the interplanar spacing and lattice constant are increased while the band gap is narrowed.
In the paper, the changes of structures and optical properties of metal ions doped modified Ca Ti O3 prepared under different magnetic field intensities(up to 12 T) and 800℃ are studied. The results indicate that the photo absorption performances are enhanced with the ions doped concentration increasing and red shift occurs significantly.With the same doped concentration, the photo absorption performances of the samples prepared under magnetic field are improved compared with under no magnetic field, while there are little differences among the absorption curves of these samples prepared under different magnetic field intensities. Furthermore, it is observed that the X-ray diffraction curve peaks of pure Ca Ti O3 prepared under magnetic field are all left-shifted and cutoff wavelengths of UV-vis are augmented,which indicates that the interplanar spacing and lattice constant are increased while the band gap is narrowed.
引文
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