Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10625051 | Ceramics International | 2014 | 6 Pages |
Abstract
Tetragonal neodymium disilicate (i.e., Nd2Si2O7) powder was synthesized in the absence and presence of 5Â wt% lithium chloride (i.e., LiCl) as a mineralizer by sol-gel method and subsequent thermal treatment process. The effect of LiCl on the crystallization process of the synthesized xerogel was investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The crystallization kinetic was analyzed at different heating rates (i.e., 2, 5, 10 and 20Â K/min) by a non-isothermal differential thermal analysis method. The activation energies of the tetragonal Nd2Si2O7 crystallization calculated by the Kissinger and the Ligero methods are 673Â kJ/mol for the xerogel without LiCl and 586Â kJ/mol for the xerogel with 5Â wt% LiCl. In addition, the crystallization mechanism was also discussed, indicating that the crystallization mechanism of the tetragonal Nd2Si2O7 changes from bulk and homogeneous to two-dimension crystallization in the presence of 5Â wt% LiCl.
Related Topics
Physical Sciences and Engineering
Materials Science
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Authors
Shanjun Ke, Yanmin Wang, Zhidong Pan,