A Comparative Rietveld Refinement Study of Natisite Prepared in Different Morphology

作者：Ferdov Stanislav^*

来源：Journal of Chemical Crystallography, 2013, 43(8): 443-447.

DOI：10.1007/s10870-013-0443-9

• Natisite
• Morphology
• Lattice strain
• Rietveld

Two morphological types of the synthetic analogue of the mineral natisite Na2TiSiO5 have been prepared in the system Na2O-TiO2-SiO2-H2O. The crystal structures of the obtained pillow (A)- and coin (B)-shaped particles have been refined with similar parameters by the method of Rietveld, compared to each other and to the available single crystal X-ray diffraction data. Sample B showed bigger unit cell with longer a = b and shorter c-axis when compared with phase A. The shorter a = b axes in phase A led to compensative elongation of the c-axis and notably longer terminal bond distance in the TiO5 semi-octahedra. Analysis of the refined structural parameters showed that Ti-O bond of the unshared apical oxygen is the most responsive to the lattice strain. Additionally, the overall mechanism of structural response to the observed microstructural distortions is discussed. %26lt;br%26gt;The possible influence of different particle morphology on the Rietveld refinement results of synthetic natisite has been evaluated.

• 出版日期2013-8