The effect of strong magnetic field on the microstructure of pure diopside and diopside doped with Fe super(3+)or Mn super(2+)

• Published in: Journal of alloys and compounds 2016-02, Vol.657, p.152-156
• Main Authors: Lia, Qiang, Liua, Fengguo, Zhanga, Xuefei, Yanga, He, Xuea, Xiangxin, Niua, Xizhi
• Format: Article
• Language: English
• Subjects: Absorbance; Calcium magnesium silicates; Diffraction; Diopside; Doping; Magnetic fields; Microstructure; X-ray diffraction
• ISSN: 0925-8388
• DOI: 10.1016/j.jallcom.2015.09.273

The current study investigates the effect of strong magnetic field on the micro-structure of pure diopside and diopside doped with Fe super(3+) or Mn super(2+). The microstructure changes were characterized by X-ray diffraction (XRD), UV-vis, and Raman spectroscopy. The results of XRD show that the strong magnetic field can increase the peak height of (311) diffraction and the height ratio of (310)/(311) is proportional to the strength of the magnetic field. UV-vis results show that the magnetic treatment and the transition-metal ion doping have some influences on the light absorbance of the diopside samples. With a fixed doping concentration, the UV-Vis absorbance of Fe super(3+)-doped samples decreased after magnetic treatments, however, same UV-Vis absorbance increased for the Mn super(2+)-doped samples. Result from Raman spectra suggests that Raman shift of the maximum peak value changed from 671 cm super(-1) before the magnetic treatment to 1015 cm super(-1) after the magnetic treatment. Meanwhile, the Raman intensities at 330 cm super(-1) and 395 cm super(-1) become more obvious after the magnetic treatment. The results of this study indicate a minor change in the relative positions among the ions, which then leads to polarizability changes.